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<a href="https://github.com/kubernetes/ingress-nginx/edit/master/docs/examples/affinity/cookie/README.md" title="Edit this page" class="md-icon md-content__icon">&#xE3C9;</a>
<h1 id="sticky-session">Sticky Session<a class="headerlink" href="#sticky-session" title="Permanent link">&para;</a></h1>
<p>This example demonstrates how to achieve session affinity using cookies</p>
<h2 id="deployment">Deployment<a class="headerlink" href="#deployment" title="Permanent link">&para;</a></h2>
<p>Session stickiness is achieved through 3 annotations on the Ingress, as shown in the <a href="ingress.yaml">example</a>.</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Description</th>
<th>Values</th>
</tr>
</thead>
<tbody>
<tr>
<td>nginx.ingress.kubernetes.io/affinity</td>
<td>Sets the affinity type</td>
<td>string (in NGINX only <code class="codehilite">cookie</code> is possible</td>
</tr>
<tr>
<td>nginx.ingress.kubernetes.io/session-cookie-name</td>
<td>Name of the cookie that will be used</td>
<td>string (default to INGRESSCOOKIE)</td>
</tr>
<tr>
<td>nginx.ingress.kubernetes.io/session-cookie-hash</td>
<td>Type of hash that will be used in cookie value</td>
<td>sha1/md5/index</td>
</tr>
</tbody>
</table>
<p>You can create the ingress to test this</p>
<div class="codehilite"><pre><span></span><span class="go">kubectl create -f ingress.yaml</span>
</pre></div>
<h2 id="validation">Validation<a class="headerlink" href="#validation" title="Permanent link">&para;</a></h2>
<p>You can confirm that the Ingress works.</p>
<p><div class="codehilite"><pre><span></span><span class="gp">$</span> kubectl describe ing nginx-test
<span class="go">Name: nginx-test</span>
<span class="go">Namespace: default</span>
<span class="go">Address: </span>
<span class="go">Default backend: default-http-backend:80 (10.180.0.4:8080,10.240.0.2:8080)</span>
<span class="go">Rules:</span>
<span class="go"> Host Path Backends</span>
<span class="go"> ---- ---- --------</span>
<span class="go"> stickyingress.example.com </span>
<span class="go"> / nginx-service:80 (&lt;none&gt;)</span>
<span class="go">Annotations:</span>
<span class="go"> affinity: cookie</span>
<span class="go"> session-cookie-hash: sha1</span>
<span class="go"> session-cookie-name: INGRESSCOOKIE</span>
<span class="go">Events:</span>
<span class="go"> FirstSeen LastSeen Count From SubObjectPath Type Reason Message</span>
<span class="go"> --------- -------- ----- ---- ------------- -------- ------ -------</span>
<span class="go"> 7s 7s 1 {nginx-ingress-controller } Normal CREATE default/nginx-test</span>
<span class="gp">$</span> curl -I http://stickyingress.example.com
<span class="go">HTTP/1.1 200 OK</span>
<span class="go">Server: nginx/1.11.9</span>
<span class="go">Date: Fri, 10 Feb 2017 14:11:12 GMT</span>
<span class="go">Content-Type: text/html</span>
<span class="go">Content-Length: 612</span>
<span class="go">Connection: keep-alive</span>
<span class="go">Set-Cookie: INGRESSCOOKIE=a9907b79b248140b56bb13723f72b67697baac3d; Path=/; HttpOnly</span>
<span class="go">Last-Modified: Tue, 24 Jan 2017 14:02:19 GMT</span>
<span class="go">ETag: &quot;58875e6b-264&quot;</span>
<span class="go">Accept-Ranges: bytes</span>
</pre></div>
In the example above, you can see a line containing the 'Set-Cookie: INGRESSCOOKIE' setting the right defined stickiness cookie.
This cookie is created by NGINX containing the hash of the used upstream in that request.
If the user changes this cookie, NGINX creates a new one and redirect the user to another upstream.</p>
<p>If the backend pool grows up NGINX will keep sending the requests through the same server of the first request, even if it's overloaded.</p>
<p>When the backend server is removed, the requests are then re-routed to another upstream server and NGINX creates a new cookie, as the previous hash became invalid.</p>
<p>When you have more than one Ingress Object pointing to the same Service, but one containing affinity configuration and other don't, the first created Ingress will be used.
This means that you can face the situation that you've configured Session Affinity in one Ingress and it doesn't reflects in NGINX configuration, because there is another Ingress Object pointing to the same service that doesn't configure this.</p>
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