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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">$</span> kubectl create -f static-ip-svc.yaml
<span class="go">service &quot;nginx-ingress-lb&quot; created</span>
<span class="gp">$</span> kubectl get svc nginx-ingress-lb
<span class="go">NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE</span>
<span class="go">nginx-ingress-lb 10.0.138.113 104.154.109.191 80:31457/TCP,443:32240/TCP 15m</span>
</code></pre></div>
<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">$</span> kubectl create -f nginx-ingress-controller.yaml
<span class="go">deployment &quot;nginx-ingress-controller&quot; created</span>
</code></pre></div>
<h2 id="assigning-the-ip-to-an-ingress">Assigning the IP to an Ingress<a class="headerlink" href="#assigning-the-ip-to-an-ingress" title="Permanent link"></a></h2>
<p>From here on every Ingress created with the <code>ingress.class</code> annotation set to
<code>nginx</code> will get the IP allocated in the previous step</p>
<div class="highlight"><pre><span></span><code><span class="gp">$</span> kubectl create -f nginx-ingress.yaml
<span class="go">ingress &quot;nginx-ingress&quot; 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>
<span class="go">client_address=10.180.1.25</span>
<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>
<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">$</span> kubectl delete ing nginx-ingress
<span class="go">ingress &quot;nginx-ingress&quot; deleted</span>
<span class="gp">$</span> kubectl create -f nginx-ingress.yaml
<span class="go">ingress &quot;nginx-ingress&quot; 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">&#39;{&quot;spec&quot;: {&quot;loadBalancerIP&quot;: &quot;104.154.109.191&quot;}}&#39;</span>
<span class="go">&quot;nginx-ingress-lb&quot; 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: &#39;2017-01-31T16:34:50.089-08:00&#39;</span>
<span class="go">description: &#39;&#39;</span>
<span class="go">id: &#39;5208037144487826373&#39;</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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