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Multiple Ingress controllers
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Multiple Ingress controllers
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Multiple ingress-nginx controllers
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<h1 id="multiple-ingress-controllers">Multiple Ingress controllers<a class="headerlink" href="#multiple-ingress-controllers" title="Permanent link">¶</a></h1>
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<p>If you're running multiple ingress controllers, or running on a cloud provider that natively handles ingress such as GKE,
|
|
you need to specify the annotation <code class="codehilite">kubernetes.io/ingress.class: "nginx"</code> in all ingresses that you would like the ingress-nginx controller to claim.</p>
|
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<p>For instance,</p>
|
|
<div class="codehilite"><pre><span></span><span class="l l-Scalar l-Scalar-Plain">metadata</span><span class="p p-Indicator">:</span>
|
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<span class="l l-Scalar l-Scalar-Plain">name</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">foo</span>
|
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<span class="l l-Scalar l-Scalar-Plain">annotations</span><span class="p p-Indicator">:</span>
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<span class="l l-Scalar l-Scalar-Plain">kubernetes.io/ingress.class</span><span class="p p-Indicator">:</span> <span class="s">"gce"</span>
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</pre></div>
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<p>will target the GCE controller, forcing the nginx controller to ignore it, while an annotation like</p>
|
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<div class="codehilite"><pre><span></span><span class="l l-Scalar l-Scalar-Plain">metadata</span><span class="p p-Indicator">:</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">name</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">foo</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">annotations</span><span class="p p-Indicator">:</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">kubernetes.io/ingress.class</span><span class="p p-Indicator">:</span> <span class="s">"nginx"</span>
|
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</pre></div>
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<p>will target the nginx controller, forcing the GCE controller to ignore it.</p>
|
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<p>To reiterate, setting the annotation to any value which does not match a valid ingress class will force the NGINX Ingress controller to ignore your Ingress.
|
|
If you are only running a single NGINX ingress controller, this can be achieved by setting the annotation to any value except "nginx" or an empty string.</p>
|
|
<p>Do this if you wish to use one of the other Ingress controllers at the same time as the NGINX controller.</p>
|
|
<h2 id="multiple-ingress-nginx-controllers">Multiple ingress-nginx controllers<a class="headerlink" href="#multiple-ingress-nginx-controllers" title="Permanent link">¶</a></h2>
|
|
<p>This mechanism also provides users the ability to run <em>multiple</em> NGINX ingress controllers (e.g. one which serves public traffic, one which serves "internal" traffic).
|
|
To do this, the option <code class="codehilite">--ingress-class</code> must be changed to a value unique for the cluster within the definition of the replication controller.
|
|
Here is a partial example:</p>
|
|
<div class="codehilite"><pre><span></span><span class="l l-Scalar l-Scalar-Plain">spec</span><span class="p p-Indicator">:</span>
|
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<span class="l l-Scalar l-Scalar-Plain">template</span><span class="p p-Indicator">:</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">spec</span><span class="p p-Indicator">:</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">containers</span><span class="p p-Indicator">:</span>
|
|
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">name</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">nginx-ingress-internal-controller</span>
|
|
<span class="l l-Scalar l-Scalar-Plain">args</span><span class="p p-Indicator">:</span>
|
|
<span class="p p-Indicator">-</span> <span class="l l-Scalar l-Scalar-Plain">/nginx-ingress-controller</span>
|
|
<span class="p p-Indicator">-</span> <span class="s">'--default-backend-service=ingress/nginx-ingress-default-backend'</span>
|
|
<span class="p p-Indicator">-</span> <span class="s">'--election-id=ingress-controller-leader-internal'</span>
|
|
<span class="p p-Indicator">-</span> <span class="s">'--ingress-class=nginx-internal'</span>
|
|
<span class="p p-Indicator">-</span> <span class="s">'--configmap=ingress/nginx-ingress-internal-controller'</span>
|
|
</pre></div>
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|
|
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|
|
<div class="admonition important">
|
|
<p class="admonition-title">Important</p>
|
|
<p>Deploying multiple Ingress controllers, of different types (e.g., <code class="codehilite">ingress-nginx</code> & <code class="codehilite">gce</code>), and not specifying a class annotation will
|
|
result in both or all controllers fighting to satisfy the Ingress, and all of them racing to update Ingress status field in confusing ways.</p>
|
|
<p>When running multiple ingress-nginx controllers, it will only process an unset class annotation if one of the controllers uses the default
|
|
<code class="codehilite">--ingress-class</code> value (see <code class="codehilite">IsValid</code> method in <code class="codehilite">internal/ingress/annotations/class/main.go</code>), otherwise the class annotation become required.</p>
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