Deploy GitHub Pages
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@ -34,7 +34,7 @@
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<meta name="lang:search.tokenizer" content="[\s\-]+">
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<link rel="shortcut icon" href="../../assets/images/favicon.png">
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<meta name="generator" content="mkdocs-1.0.4, mkdocs-material-4.4.3">
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<meta name="generator" content="mkdocs-1.0.4, mkdocs-material-4.6.2">
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@ -42,7 +42,7 @@
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<link rel="stylesheet" href="../../assets/stylesheets/application.30686662.css">
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<link rel="stylesheet" href="../../assets/stylesheets/application.adb8469c.css">
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<link rel="stylesheet" href="../../assets/stylesheets/application-palette.a8b3c06d.css">
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@ -53,12 +53,12 @@
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<script src="../../assets/javascripts/modernizr.74668098.js"></script>
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<script src="../../assets/javascripts/modernizr.86422ebf.js"></script>
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<link href="https://fonts.gstatic.com" rel="preconnect" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700|Roboto+Mono&display=fallback">
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,400i,700%7CRoboto+Mono&display=fallback">
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<style>body,input{font-family:"Roboto","Helvetica Neue",Helvetica,Arial,sans-serif}code,kbd,pre{font-family:"Roboto Mono","Courier New",Courier,monospace}</style>
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@ -114,7 +114,7 @@
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<input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
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<label class="md-overlay" data-md-component="overlay" for="__drawer"></label>
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<a href="#availability-zone-aware-routing" tabindex="1" class="md-skip">
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<a href="#availability-zone-aware-routing" tabindex="0" class="md-skip">
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Skip to content
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</a>
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@ -123,7 +123,7 @@
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<nav class="md-header-nav md-grid">
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<div class="md-flex">
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<div class="md-flex__cell md-flex__cell--shrink">
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<a href="https://kubernetes.github.io/ingress-nginx" title="NGINX Ingress Controller" class="md-header-nav__button md-logo">
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<a href="https://kubernetes.github.io/ingress-nginx" title="NGINX Ingress Controller" aria-label="NGINX Ingress Controller" class="md-header-nav__button md-logo">
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<i class="md-icon">public</i>
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@ -154,7 +154,7 @@
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<label class="md-search__overlay" for="__search"></label>
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<div class="md-search__inner" role="search">
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="query" data-md-state="active">
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<input type="text" class="md-search__input" aria-label="search" name="query" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="query" data-md-state="active">
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<label class="md-icon md-search__icon" for="__search"></label>
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<button type="reset" class="md-icon md-search__icon" data-md-component="reset" tabindex="-1">
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
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@ -1250,13 +1250,13 @@ if there is no zone-local endpoint then it will fallback to current behaviour.</
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<p><strong>How does controller know what zone it runs in?</strong>
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We can have the pod spec do pass node name using downward API as an environment variable.
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Then on start controller can get node details from the API based on node name. Once the node details is obtained
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we can extract the zone from <code class="codehilite">failure-domain.beta.kubernetes.io/zone</code> annotation. Then we can pass that value to Lua land through Nginx configuration
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when loading <code class="codehilite">lua_ingress.lua</code> module in <code class="codehilite">init_by_lua</code> phase.</p>
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we can extract the zone from <code class="codehilite"><span class="err">failure-domain.beta.kubernetes.io/zone</span></code> annotation. Then we can pass that value to Lua land through Nginx configuration
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when loading <code class="codehilite"><span class="err">lua_ingress.lua</span></code> module in <code class="codehilite"><span class="err">init_by_lua</span></code> phase.</p>
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<p><strong>How do we extract zones for endpoints?</strong>
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We can have the controller watch create and update events on nodes in the entire cluster and based on that keep the map of nodes to zones in the memory.
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And when we generate endpoints list, we can access node name using <code class="codehilite"><span class="na">.subsets.addresses</span><span class="p">[</span><span class="no">i</span><span class="p">].</span><span class="no">nodeName</span></code>
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And when we generate endpoints list, we can access node name using <code class="codehilite"><span class="p">.</span><span class="n">subsets</span><span class="p">.</span><span class="n">addresses</span><span class="o">[</span><span class="n">i</span><span class="o">]</span><span class="p">.</span><span class="n">nodeName</span><span class="w"></span></code>
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and based on that fetch zone from the map in memory and store it as a field on the endpoint.
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<strong>This solution assumes <code class="codehilite">failure-domain.beta.kubernetes.io/zone</code></strong> annotation does not change until the end of node's life. Otherwise we have to
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<strong>This solution assumes <code class="codehilite"><span class="err">failure-domain.beta.kubernetes.io/zone</span></code></strong> annotation does not change until the end of node's life. Otherwise we have to
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watch update events as well on the nodes and that'll add even more overhead.</p>
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<p>Alternatively, we can get the list of nodes only when there's no node in the memory for given node name. This is probably a better solution
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because then we would avoid watching for API changes on node resources. We can eagrly fetch all the nodes and build node name to zone mapping on start.
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@ -1279,6 +1279,7 @@ see no endpoints for the backend and therefore we will use general balancer.</p>
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@ -1298,9 +1299,9 @@ see no endpoints for the backend and therefore we will use general balancer.</p>
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<div class="md-footer-copyright">
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powered by
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<a href="https://www.mkdocs.org">MkDocs</a>
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<a href="https://www.mkdocs.org" target="_blank" rel="noopener">MkDocs</a>
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and
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<a href="https://squidfunk.github.io/mkdocs-material/">
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<a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener">
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Material for MkDocs</a>
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</div>
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@ -1310,7 +1311,7 @@ see no endpoints for the backend and therefore we will use general balancer.</p>
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</div>
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<script src="../../assets/javascripts/application.ac79c3b0.js"></script>
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<script src="../../assets/javascripts/application.c33a9706.js"></script>
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<script>app.initialize({version:"1.0.4",url:{base:"../.."}})</script>
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