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<article class="md-content__inner md-typeset">
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<a href="https://github.com/kubernetes/ingress-nginx/edit/master/docs/enhancements/20190815-zone-aware-routing.md" title="Edit this page" class="md-icon md-content__icon"></a>
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<h1 id="availability-zone-aware-routing">Availability zone aware routing<a class="headerlink" href="#availability-zone-aware-routing" title="Permanent link"> ¶</a></h1>
|
|
<h2 id="table-of-contents">Table of Contents<a class="headerlink" href="#table-of-contents" title="Permanent link"> ¶</a></h2>
|
|
<!-- toc -->
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<ul>
|
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<li><a href="#summary">Summary</a></li>
|
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<li><a href="#motivation">Motivation</a></li>
|
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<li><a href="#goals">Goals</a></li>
|
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<li><a href="#non-goals">Non-Goals</a></li>
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<li><a href="#proposal">Proposal</a></li>
|
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<li><a href="#implementation-history">Implementation History</a></li>
|
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<li><a href="#drawbacks-optional">Drawbacks [optional]</a>
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<!-- /toc --></li>
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</ul>
|
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<h2 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link"> ¶</a></h2>
|
|
<p>Teach ingress-nginx about availability zones where endpoints are running in. This way ingress-nginx pod will do its best to proxy to zone-local endpoint.</p>
|
|
<h2 id="motivation">Motivation<a class="headerlink" href="#motivation" title="Permanent link"> ¶</a></h2>
|
|
<p>When users run their services across multiple availability zones they usually pay for egress traffic between zones. Providers such as GCP, Amazon EC charges money for that.
|
|
ingress-nginx when picking an endpoint to route request to does not consider whether the endpoint is in different zone or the same one. That means it's at least equally likely
|
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that it will pick an endpoint from another zone and proxy the request to it. In this situation response from the endpoint to ingress-nginx pod is considered as
|
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inter zone traffic and costs money.</p>
|
|
<p>At the time of this writing GCP charges $0.01 per GB of inter zone egress traffic according to https://cloud.google.com/compute/network-pricing.
|
|
According to https://datapath.io/resources/blog/what-are-aws-data-transfer-costs-and-how-to-minimize-them/ Amazon also charges the same amount of money sa GCP for cross zone, egress traffic.</p>
|
|
<p>This can be a lot of money depending on once's traffic. By teaching ingress-nginx about zones we can eliminate or at least decrease this cost.</p>
|
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<p>Arguably inter-zone network latency should also be better than cross zone.</p>
|
|
<h3 id="goals">Goals<a class="headerlink" href="#goals" title="Permanent link"> ¶</a></h3>
|
|
<ul>
|
|
<li>Given a regional cluster running ingress-nginx, ingress-nginx should do best effort to pick zone-local endpoint when proxying</li>
|
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<li>This should not impact canary feature</li>
|
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<li>ingress-nginx should be able to operate successfully if there's no zonal endpoints</li>
|
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</ul>
|
|
<h3 id="non-goals">Non-Goals<a class="headerlink" href="#non-goals" title="Permanent link"> ¶</a></h3>
|
|
<ul>
|
|
<li>This feature inherently assumes that endpoints are distributed across zones in a way that they can handle all the traffic from ingress-nginx pod(s) in that zone</li>
|
|
<li>This feature will be relying on https://kubernetes.io/docs/reference/kubernetes-api/labels-annotations-taints/#failure-domainbetakubernetesiozone, it is not this KEP's goal to support other cases</li>
|
|
</ul>
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<h2 id="proposal">Proposal<a class="headerlink" href="#proposal" title="Permanent link"> ¶</a></h2>
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<p>The idea here is to have controller part of ingress-nginx to (1) detect what zone its current pod is running in and (2) detect the zone for every endpoints it knows about.
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After that it will post that data as part of endpoints to Lua land. Then Lua balancer when picking an endpoint will try to pick zone-local endpoint first and
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if there is no zone-local endpoint then it will fallback to current behaviour.</p>
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<p>This feature at least in the beginning should be optional since it is going to make it harder to reason about the load balancing and not everyone might want that.</p>
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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"><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="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"><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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And from thereon sync it during endpoints building in the main event loop iff there's no entry exist for the node of an endpoint.
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This means an extra API call in case cluster has expanded.</p>
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<p><strong>How do we make sure we do our best to choose zone-local endpoint?</strong>
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This will be done on Lua side. For every backend we will initialize two balancer instances: (1) with all endpoints
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(2) with all endpoints corresponding to current zone for the backend. Then given the request once we choose what backend
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needs to serve the request, we will first try to use zonal balancer for that backend. If zonal balancer does not exist (i.e there's no zonal endpoint)
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then we will use general balancer. In case of zonal outages we assume that readiness probe will fail and controller will
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see no endpoints for the backend and therefore we will use general balancer.</p>
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<p>We can enable the feature using a configmap setting. Doing it this way makes it easier to rollback in case of a problem.</p>
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<h2 id="implementation-history">Implementation History<a class="headerlink" href="#implementation-history" title="Permanent link"> ¶</a></h2>
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<ul>
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<li>initial version of KEP is shipped</li>
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<li>proposal and implementation details is done</li>
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</ul>
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<h2 id="drawbacks-optional">Drawbacks [optional]<a class="headerlink" href="#drawbacks-optional" title="Permanent link"> ¶</a></h2>
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<p>More load on the Kubernetes API server.</p>
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