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<h1 id="static-ips">Static IPs<a class="headerlink" href="#static-ips" title="Permanent link"> ¶</a></h1>
|
|
<p>This example demonstrates how to assign a static-ip to an Ingress on through the Nginx controller.</p>
|
|
<h2 id="prerequisites">Prerequisites<a class="headerlink" href="#prerequisites" title="Permanent link"> ¶</a></h2>
|
|
<p>You need a <a href="../PREREQUISITES/#tls-certificates">TLS cert</a> and a <a href="../PREREQUISITES/#test-http-service">test HTTP service</a> for this example.
|
|
You will also need to make sure your Ingress targets exactly one Ingress
|
|
controller by specifying the <a href="../../user-guide/multiple-ingress/">ingress.class annotation</a>,
|
|
and that you have an ingress controller <a href="../../deploy/">running</a> in your cluster.</p>
|
|
<h2 id="acquiring-an-ip">Acquiring an IP<a class="headerlink" href="#acquiring-an-ip" title="Permanent link"> ¶</a></h2>
|
|
<p>Since instances of the nginx controller actually run on nodes in your cluster,
|
|
by default nginx Ingresses will only get static IPs if your cloudprovider
|
|
supports static IP assignments to nodes. On GKE/GCE for example, even though
|
|
nodes get static IPs, the IPs are not retained across upgrade.</p>
|
|
<p>To acquire a static IP for the nginx ingress controller, simply put it
|
|
behind a Service of <code>Type=LoadBalancer</code>.</p>
|
|
<p>First, create a loadbalancer Service and wait for it to acquire an IP</p>
|
|
<div class="highlight"><pre><span></span><code><span class="gp">$</span> kubectl create -f static-ip-svc.yaml
|
|
<span class="go">service "nginx-ingress-lb" created</span>
|
|
|
|
<span class="gp">$</span> kubectl get svc nginx-ingress-lb
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|
<span class="go">NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE</span>
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|
<span class="go">nginx-ingress-lb 10.0.138.113 104.154.109.191 80:31457/TCP,443:32240/TCP 15m</span>
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|
</code></pre></div>
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|
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<p>then, update the ingress controller so it adopts the static IP of the Service
|
|
by passing the <code>--publish-service</code> flag (the example yaml used in the next step
|
|
already has it set to "nginx-ingress-lb").</p>
|
|
<div class="highlight"><pre><span></span><code><span class="gp">$</span> kubectl create -f nginx-ingress-controller.yaml
|
|
<span class="go">deployment "nginx-ingress-controller" created</span>
|
|
</code></pre></div>
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<h2 id="assigning-the-ip-to-an-ingress">Assigning the IP to an Ingress<a class="headerlink" href="#assigning-the-ip-to-an-ingress" title="Permanent link"> ¶</a></h2>
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|
<p>From here on every Ingress created with the <code>ingress.class</code> annotation set to
|
|
<code>nginx</code> will get the IP allocated in the previous step</p>
|
|
<div class="highlight"><pre><span></span><code><span class="gp">$</span> kubectl create -f nginx-ingress.yaml
|
|
<span class="go">ingress "nginx-ingress" created</span>
|
|
|
|
<span class="gp">$</span> kubectl get ing ingress-nginx
|
|
<span class="go">NAME HOSTS ADDRESS PORTS AGE</span>
|
|
<span class="go">nginx-ingress * 104.154.109.191 80, 443 13m</span>
|
|
|
|
<span class="gp">$</span> curl <span class="m">104</span>.154.109.191 -kL
|
|
<span class="go">CLIENT VALUES:</span>
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|
<span class="go">client_address=10.180.1.25</span>
|
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<span class="go">command=GET</span>
|
|
<span class="go">real path=/</span>
|
|
<span class="go">query=nil</span>
|
|
<span class="go">request_version=1.1</span>
|
|
<span class="go">request_uri=http://104.154.109.191:8080/</span>
|
|
<span class="go">...</span>
|
|
</code></pre></div>
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|
|
|
<h2 id="retaining-the-ip">Retaining the IP<a class="headerlink" href="#retaining-the-ip" title="Permanent link"> ¶</a></h2>
|
|
<p>You can test retention by deleting the Ingress</p>
|
|
<div class="highlight"><pre><span></span><code><span class="gp">$</span> kubectl delete ing nginx-ingress
|
|
<span class="go">ingress "nginx-ingress" deleted</span>
|
|
|
|
<span class="gp">$</span> kubectl create -f nginx-ingress.yaml
|
|
<span class="go">ingress "nginx-ingress" created</span>
|
|
|
|
<span class="gp">$</span> kubectl get ing nginx-ingress
|
|
<span class="go">NAME HOSTS ADDRESS PORTS AGE</span>
|
|
<span class="go">nginx-ingress * 104.154.109.191 80, 443 13m</span>
|
|
</code></pre></div>
|
|
|
|
<blockquote>
|
|
<p>Note that unlike the GCE Ingress, the same loadbalancer IP is shared amongst all
|
|
Ingresses, because all requests are proxied through the same set of nginx
|
|
controllers.</p>
|
|
</blockquote>
|
|
<h2 id="promote-ephemeral-to-static-ip">Promote ephemeral to static IP<a class="headerlink" href="#promote-ephemeral-to-static-ip" title="Permanent link"> ¶</a></h2>
|
|
<p>To promote the allocated IP to static, you can update the Service manifest</p>
|
|
<div class="highlight"><pre><span></span><code><span class="gp">$</span> kubectl patch svc nginx-ingress-lb -p <span class="s1">'{"spec": {"loadBalancerIP": "104.154.109.191"}}'</span>
|
|
<span class="go">"nginx-ingress-lb" patched</span>
|
|
</code></pre></div>
|
|
|
|
<p>and promote the IP to static (promotion works differently for cloudproviders,
|
|
provided example is for GKE/GCE)
|
|
`
|
|
<div class="highlight"><pre><span></span><code><span class="gp">$</span> gcloud compute addresses create nginx-ingress-lb --addresses <span class="m">104</span>.154.109.191 --region us-central1
|
|
<span class="go">Created [https://www.googleapis.com/compute/v1/projects/kubernetesdev/regions/us-central1/addresses/nginx-ingress-lb].</span>
|
|
<span class="go">---</span>
|
|
<span class="go">address: 104.154.109.191</span>
|
|
<span class="go">creationTimestamp: '2017-01-31T16:34:50.089-08:00'</span>
|
|
<span class="go">description: ''</span>
|
|
<span class="go">id: '5208037144487826373'</span>
|
|
<span class="go">kind: compute#address</span>
|
|
<span class="go">name: nginx-ingress-lb</span>
|
|
<span class="go">region: us-central1</span>
|
|
<span class="go">selfLink: https://www.googleapis.com/compute/v1/projects/kubernetesdev/regions/us-central1/addresses/nginx-ingress-lb</span>
|
|
<span class="go">status: IN_USE</span>
|
|
<span class="go">users:</span>
|
|
<span class="go">- us-central1/forwardingRules/a09f6913ae80e11e6a8c542010af0000</span>
|
|
</code></pre></div></p>
|
|
<p>Now even if the Service is deleted, the IP will persist, so you can recreate the
|
|
Service with <code>spec.loadBalancerIP</code> set to <code>104.154.109.191</code>.</p>
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