Domain firstprincipleresilience.com
United States
AMAZON-02
Software information
AmazonS3
tcp/443
CloudFront
tcp/80
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MacOS file listing through .DS_Store file
.DS_Store” is an abbreviation for “Desktop Services Store”. These files are created automatically by Apples “Finder” software (which is part of their OS).
They store information about the files within a folder, including display options of folders, such as icon positions and view settings.
It may happen that .DS_Store files inadvertently leak filenames such as database backups or private administration panels.
IP: 108.138.7.9
Domain: firstprincipleresilience.com
Port: 443
URL: https://firstprincipleresilience.comFirst seen 2024-02-17 10:14
Last seen 2026-01-02 15:37
Open for 685 days-
Severity: low
Fingerprint: 5f32cf5d6962f09c1a5d9b0f1a5d9b0fb246cfc7db4a95d2a31935b7a31935b7Found 3 files trough .DS_Store spidering: /img /img/authors /img/diagrams
Found on 2026-01-02 15:37
-
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MacOS file listing through .DS_Store file
.DS_Store” is an abbreviation for “Desktop Services Store”. These files are created automatically by Apples “Finder” software (which is part of their OS).
They store information about the files within a folder, including display options of folders, such as icon positions and view settings.
It may happen that .DS_Store files inadvertently leak filenames such as database backups or private administration panels.
IP: 108.138.7.97
Domain: www.firstprincipleresilience.com
Port: 443
URL: https://www.firstprincipleresilience.comFirst seen 2024-02-17 10:14
Last seen 2026-01-02 15:37
Open for 685 days-
Severity: low
Fingerprint: 5f32cf5d6962f09c1a5d9b0f1a5d9b0fb246cfc7db4a95d2a31935b7a31935b7Found 3 files trough .DS_Store spidering: /img /img/authors /img/diagrams
Found on 2026-01-02 15:37
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Open service 108.138.7.97:443 · www.firstprincipleresilience.com
2026-01-09 12:18
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 08 Jan 2026 23:29:29 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 e1f996a9009532eeea33edfd32ef3240.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: F-1gAyrEH4u3x6MZV6ZoUuqMnZke-Sqe15hhH7he1tQIyv_-hTfCAQ== Age: 46123 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2026-01-09 by HttpPluginCreate report
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Open service 108.138.7.9:443 · firstprincipleresilience.com
2026-01-09 12:18
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 08 Jan 2026 23:29:29 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 c0c6d7afa25d841027d75444425d2010.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: zbnPE3Px8_Wgx6IjiKVC4VrDRUdgjHFLLbgMSrytsBjERCNbnDWTHg== Age: 46122 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2026-01-09 by HttpPluginCreate report
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Open service 108.138.7.9:443 · firstprincipleresilience.com
2026-01-02 15:37
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT Server: AmazonS3 Date: Thu, 01 Jan 2026 21:20:21 GMT ETag: "267e81a504df9f0012199f4694a50763" X-Cache: Hit from cloudfront Via: 1.1 f61953901038b0c4b4c82c311140f1b8.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: CjBCfoFLYUAjvnkMh55Q0dyRdaO7OvHkEMALm33iGfXR_w4MoHYAuQ== Age: 65850 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2026-01-02 by HttpPluginCreate report
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Open service 108.138.7.97:443 · www.firstprincipleresilience.com
2026-01-02 15:37
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT Server: AmazonS3 Date: Thu, 01 Jan 2026 21:20:21 GMT ETag: "267e81a504df9f0012199f4694a50763" X-Cache: Hit from cloudfront Via: 1.1 6b85d8725dd6471c3db1f65d4096afc4.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: LrEFsgwEY65anIfC2i_dlw6MOjnbzXMuiJST_ko5gSR1j_iBv0cwNQ== Age: 65850 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2026-01-02 by HttpPluginCreate report
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Open service 108.138.7.9:443 · firstprincipleresilience.com
2025-12-23 01:12
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT Server: AmazonS3 Date: Mon, 22 Dec 2025 06:29:31 GMT ETag: "267e81a504df9f0012199f4694a50763" X-Cache: Hit from cloudfront Via: 1.1 61c90c70feca5f532bf48bc0dc85d516.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: oRLmzveRYdL7X4EsOrI6HDMLBQOO8wPS_2_ovQN6JdbVQNUPTL0P7w== Age: 67388 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-23 by HttpPluginCreate report
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Open service 108.138.7.97:443 · www.firstprincipleresilience.com
2025-12-23 01:12
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT Server: AmazonS3 Date: Mon, 22 Dec 2025 06:29:31 GMT ETag: "267e81a504df9f0012199f4694a50763" X-Cache: Hit from cloudfront Via: 1.1 6b85d8725dd6471c3db1f65d4096afc4.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: meVtIIWIv2a30yJbrt0og1c6qUxS_jVOaK4n-y_T6WEsOQP9-0_3eA== Age: 67387 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-23 by HttpPluginCreate report
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Open service 108.138.7.9:443 · firstprincipleresilience.com
2025-12-21 09:16
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT Server: AmazonS3 Date: Sun, 21 Dec 2025 05:11:46 GMT ETag: "267e81a504df9f0012199f4694a50763" X-Cache: Hit from cloudfront Via: 1.1 002af2e4f72157b8b4bd2de012b5b57c.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: gfc6mBL2onhLCrSRG5yFyZnTeqe9dgFI8Hn_vaQ_D9yE67ykfMfjlw== Age: 14656 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-21 by HttpPluginCreate report
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Open service 108.138.7.97:443 · www.firstprincipleresilience.com
2025-12-21 09:16
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT Server: AmazonS3 Date: Sun, 21 Dec 2025 05:11:46 GMT ETag: "267e81a504df9f0012199f4694a50763" X-Cache: Hit from cloudfront Via: 1.1 f13110b40e6214ad566c753a838f49f4.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: VqVdUdmee43obhbTyldc6M_r5_eE24S7zUeG6PUplg1EnpcyINKgDg== Age: 14655 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-21 by HttpPluginCreate report
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Open service 108.138.7.9:443 · firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 18 Dec 2025 03:21:23 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 bfb5bffe90e3b0e760933a7a07d850ba.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: U2eLRVU_rB_wykPUCUgdp2gwHHVnIqahn8O7rpfopNy1T6CVYsgNAg== Age: 82591 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.97:443 · firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 18 Dec 2025 03:21:23 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 6278ee254a7d35c23aae5e936b5a56ee.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: TnLVsEfmLAPoaUNm7UjzgV93fZs2dpKWhxeOrFL-Kj3Y9GiHWCxrnA== Age: 82591 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.97:80 · firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 301 Moved Permanently Server: CloudFront Date: Fri, 19 Dec 2025 02:17:53 GMT Content-Type: text/html Content-Length: 167 Connection: close Location: https://firstprincipleresilience.com/ X-Cache: Redirect from cloudfront Via: 1.1 dd09b3b5f5b8dc626e1ba6804a73af40.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: gc8psSiBUwh9e9tsBmGQlR6mOd2BQ2vwaiOz3MhXl0VUsehZehtVDA== Page title: 301 Moved Permanently <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>CloudFront</center> </body> </html>
Found 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.81:443 · firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 18 Dec 2025 03:21:23 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 b26b931354407da013ac53d2c1c55034.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: BE69OEZAVwtzeB98wZL0dtVlPXihHDvi2N6idb7sdRS4aqk5WaCVYw== Age: 82591 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.97:80 · www.firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 301 Moved Permanently Server: CloudFront Date: Fri, 19 Dec 2025 02:17:53 GMT Content-Type: text/html Content-Length: 167 Connection: close Location: https://www.firstprincipleresilience.com/ X-Cache: Redirect from cloudfront Via: 1.1 88cabd6b8652306789c6bc8090fbcb1a.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: WLhGnBSKVoKcgBQXWEncCbHLbVdVXjc8uD3BhMYEnI1mwPX3_PZ9zQ== Page title: 301 Moved Permanently <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>CloudFront</center> </body> </html>
Found 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.82:443 · www.firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 18 Dec 2025 03:21:23 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 e96aebc8d7c9ec82b88c3160a18fed96.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: VbA4KmB5L00CLpcTbTrLB_imn10p7CMHz4r367fZAdxXf4iM2aNMdw== Age: 82591 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.82:80 · firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 301 Moved Permanently Server: CloudFront Date: Fri, 19 Dec 2025 02:17:53 GMT Content-Type: text/html Content-Length: 167 Connection: close Location: https://firstprincipleresilience.com/ X-Cache: Redirect from cloudfront Via: 1.1 002af2e4f72157b8b4bd2de012b5b57c.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: Qfqw68ztfXJ93wTIvLt2li5YAqo_0rLUxVjnHK27X1dX36jVprob7A== Page title: 301 Moved Permanently <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>CloudFront</center> </body> </html>
Found 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.81:80 · firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 301 Moved Permanently Server: CloudFront Date: Fri, 19 Dec 2025 02:17:53 GMT Content-Type: text/html Content-Length: 167 Connection: close Location: https://firstprincipleresilience.com/ X-Cache: Redirect from cloudfront Via: 1.1 c3fc8d1fb362a6655af993732c376dc4.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: yY6bQT0HC3Vv65cBompgKJJa7p_Fs523ySNXZaAA71HKJiPQISmW-w== Page title: 301 Moved Permanently <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>CloudFront</center> </body> </html>
Found 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.81:443 · www.firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 18 Dec 2025 03:21:23 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 dd09b3b5f5b8dc626e1ba6804a73af40.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: EvfbCAyqdVu3fHZ5iqekmK08x9V2wcXDEjPUqTbzFsam1bPeqWdlew== Age: 82591 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.81:80 · www.firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 301 Moved Permanently Server: CloudFront Date: Fri, 19 Dec 2025 02:17:52 GMT Content-Type: text/html Content-Length: 167 Connection: close Location: https://www.firstprincipleresilience.com/ X-Cache: Redirect from cloudfront Via: 1.1 149b1af6ad8d2c0fedea82bfb1c29c66.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: _AX17mjls2YPFTWK9Z1er3yebUYFaF_duNZwQUwnR8Mrtnwl3_2wqQ== Page title: 301 Moved Permanently <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>CloudFront</center> </body> </html>
Found 2025-12-19 by HttpPluginCreate report
-
Open service 108.138.7.82:80 · www.firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 301 Moved Permanently Server: CloudFront Date: Fri, 19 Dec 2025 02:17:52 GMT Content-Type: text/html Content-Length: 167 Connection: close Location: https://www.firstprincipleresilience.com/ X-Cache: Redirect from cloudfront Via: 1.1 ab68583a58d574d6a9e5fca1fb1e6316.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: Kx8ceq2VxGLluaDuW5s2vypwUf1_A1ZFC4Vmj7-4aGGrDEryZrOUKA== Page title: 301 Moved Permanently <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>CloudFront</center> </body> </html>
Found 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.9:80 · firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 301 Moved Permanently Server: CloudFront Date: Fri, 19 Dec 2025 02:17:52 GMT Content-Type: text/html Content-Length: 167 Connection: close Location: https://firstprincipleresilience.com/ X-Cache: Redirect from cloudfront Via: 1.1 149b1af6ad8d2c0fedea82bfb1c29c66.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: S6hMG406uRHP428Nl9EAKY1IG23FA5nW8UXZHEb-I-6GSRYDNaz91w== Page title: 301 Moved Permanently <html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>CloudFront</center> </body> </html>
Found 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.82:443 · firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 18 Dec 2025 03:21:23 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 cfbb6e543d97587a32117dbabb25fc86.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: md6fvtiIFedfUg-6PTgeLtS6e2c4H6DLjx_gRSgpEd6vNa_9pjduhw== Age: 82590 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.97:443 · www.firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 18 Dec 2025 03:21:23 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 0ece2d48b2ca1badca11fa675b7785ea.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: ILHZd_Yl6r6DjOhQxBdq7fC2SVvjDwyZXvwAbn1CKz3R0iqtgeAPMw== Age: 82590 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.9:443 · www.firstprincipleresilience.com
2025-12-19 02:17
HTTP/1.1 200 OK Content-Type: text/html Content-Length: 12197 Connection: close Date: Thu, 18 Dec 2025 03:21:23 GMT x-amz-meta-codebuild-content-sha256: 7073379b5fc887409198a749351eab536de4a6665878d02e82d5c70448053d37 x-amz-meta-codebuild-buildarn: arn:aws:codebuild:us-east-2:545212347593:build/CodeBuildProject-QWRUZY9RO6D4:0d01349c-f487-4de2-a36a-a12ddf643199 x-amz-meta-codebuild-content-md5: cb654ab6a7ce45d30d63d4524930bcf0 Last-Modified: Fri, 26 May 2023 23:34:56 GMT ETag: "267e81a504df9f0012199f4694a50763" Server: AmazonS3 X-Cache: Hit from cloudfront Via: 1.1 fb5610ec56d3f427bcbcfdd851770614.cloudfront.net (CloudFront) X-Amz-Cf-Pop: FRA56-P6 X-Amz-Cf-Id: YiqPZnQd2Z9_ReJcxVi3gewTw9i5V7mLuha07hbey2GJ5Zj3XG5LvA== Age: 82590 Page title: Principle Resilience <!DOCTYPE html> <html class="no-js" lang="en"> <head> <meta name="generator" content="Hugo 0.70.0" /> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Principle Resilience</title> <script>(function(d,e){d[e]=d[e].replace("no-js","js");})(document.documentElement,"className");</script> <meta name="description" content=""> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link rel="dns-prefetch" href="//fonts.googleapis.com"> <link rel="dns-prefetch" href="//fonts.gstatic.com"> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:400,400i,700"> <link rel="stylesheet" href="/css/style.css"> <link rel="alternate" type="application/rss+xml" href="/index.xml" title="Principle Resilience"> <link rel="shortcut icon" href="/favicon.ico"> </head> <body class="body"> <div class="container container--outer"> <header class="header"> <div class="container header__container"> <div class="logo logo--mixed"> <a class="logo__link" href="/" title="Principle Resilience" rel="home"> <div class="logo__item logo__imagebox"> <img class="logo__img" src="/img/IMG_2471.png"> </div><div class="logo__item logo__text"> <div class="logo__title">Principle Resilience</div> <div class="logo__tagline">A place for learning distributed systems resilience</div> </div> </a> </div> <nav class="menu"> <button class="menu__btn" aria-haspopup="true" aria-expanded="false" tabindex="0"> <span class="menu__btn-title" tabindex="-1">Menu</span> </button> <ul class="menu__list"> <li class="menu__item"> <a class="menu__link" href="/about/"> <span class="menu__text">About</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/articles/"> <span class="menu__text">Articles</span> </a> </li> <li class="menu__item"> <a class="menu__link" href="/products/"> <span class="menu__text">Products</span> </a> </li> </ul> </nav> </div> </header> <div class="wrapper flex"> <div class="primary"> <main class="main list" role="main"> <article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howtosimulatehowcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/SimulateHowCloudNetworksFail.png" alt="How to Simulate How Cloud Networks Fail"> </a> </figure> <header class="list__header"> <h2 class="list__title post__title"> <a href="/articles/howtosimulatehowcloudnetworksfail/" rel="bookmark"> How to Simulate How Cloud Networks Fail </a> </h2> <p class="list__lead post__lead">Cloud networks, and most massively scaled networks, are subject to partial failures that will impact some of your application connections but not others. Congestion will lead to intermittent packet loss and is another flavor of partial impact that occurs in multi-tenant environments. How do you know if your monitoring, health checks and failure mitigations, like host removal and retry, will mitigate these kinds of failures? You test! This article will show you how you can use Linux IPTables, routing policies and network control to simulate cloud network failures.</p> </header> <div class="content list__excerpt post__content clearfix"> Linux has come a long way with tooling for simulating network failures. The traffic control (tc) tool has a wonderful bag of tricks for simulating total packet loss, intermittent packet loss and delays. Tc even provides random distributions of packet loss for additional realism in testing. However, tc doesn’t support random % of network flow impacts. As a reminder, network flows are defined as a 5-tuple of ip address, ports and protocol. </div> </article><article class="list__item post"> <figure class="list__thumbnail thumbnail"> <a class="thumbnail__link" href="/articles/howcloudnetworksfail/"> <img class="thumbnail__image" src="/img/diagrams/CloudNetworFound 2025-12-19 by HttpPluginCreate report
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Open service 108.138.7.9:80 · www.firstprincipleresilience.com
2025-12-19 02:17
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