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user-guide/multiple-ingress/index.html
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<nav class="md-header-nav md-grid">
<div class="md-flex">
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<a href="https://kubernetes.github.io/ingress-nginx" title="NGINX Ingress Controller" class="md-header-nav__button md-logo">
<a href="https://kubernetes.github.io/ingress-nginx" title="NGINX Ingress Controller" aria-label="NGINX Ingress Controller" class="md-header-nav__button md-logo">
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<h1 id="multiple-ingress-controllers">Multiple Ingress controllers<a class="headerlink" href="#multiple-ingress-controllers" title="Permanent link"></a></h1>
<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: &quot;nginx&quot;</code> in all ingresses that you would like the ingress-nginx controller to claim.</p>
you need to specify the annotation <code class="codehilite"><span class="err">kubernetes.io/ingress.class: &quot;nginx&quot;</span></code> in all ingresses that you would like the ingress-nginx controller to claim.</p>
<p>For instance,</p>
<div class="codehilite"><pre><span></span><span class="nt">metadata</span><span class="p">:</span>
<div class="codehilite"><pre><span></span><code><span class="nt">metadata</span><span class="p">:</span>
<span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">foo</span>
<span class="nt">annotations</span><span class="p">:</span>
<span class="nt">kubernetes.io/ingress.class</span><span class="p">:</span> <span class="s">&quot;gce&quot;</span>
</pre></div>
</code></pre></div>
<p>will target the GCE controller, forcing the nginx controller to ignore it, while an annotation like</p>
<div class="codehilite"><pre><span></span><span class="nt">metadata</span><span class="p">:</span>
<div class="codehilite"><pre><span></span><code><span class="nt">metadata</span><span class="p">:</span>
<span class="nt">name</span><span class="p">:</span> <span class="l l-Scalar l-Scalar-Plain">foo</span>
<span class="nt">annotations</span><span class="p">:</span>
<span class="nt">kubernetes.io/ingress.class</span><span class="p">:</span> <span class="s">&quot;nginx&quot;</span>
</pre></div>
</code></pre></div>
<p>will target the nginx controller, forcing the GCE controller to ignore it.</p>
<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.
@ -1216,9 +1216,9 @@ If you are only running a single NGINX ingress controller, this can be achieved
<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.
To do this, the option <code class="codehilite"><span class="err">--ingress-class</span></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="nt">spec</span><span class="p">:</span>
<div class="codehilite"><pre><span></span><code><span class="nt">spec</span><span class="p">:</span>
<span class="nt">template</span><span class="p">:</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="nt">containers</span><span class="p">:</span>
@ -1228,18 +1228,19 @@ Here is a partial example:</p>
<span class="p p-Indicator">-</span> <span class="s">&#39;--election-id=ingress-controller-leader-internal&#39;</span>
<span class="p p-Indicator">-</span> <span class="s">&#39;--ingress-class=nginx-internal&#39;</span>
<span class="p p-Indicator">-</span> <span class="s">&#39;--configmap=ingress/nginx-ingress-internal-controller&#39;</span>
</pre></div>
</code></pre></div>
<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> &amp; <code class="codehilite">gce</code>), and not specifying a class annotation will
<p>Deploying multiple Ingress controllers, of different types (e.g., <code class="codehilite"><span class="err">ingress-nginx</span></code> &amp; <code class="codehilite"><span class="err">gce</span></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>
<code class="codehilite"><span class="err">--ingress-class</span></code> value (see <code class="codehilite"><span class="err">IsValid</span></code> method in <code class="codehilite"><span class="err">internal/ingress/annotations/class/main.go</span></code>), otherwise the class annotation become required.</p>
</div>
@ -1294,9 +1295,9 @@ result in both or all controllers fighting to satisfy the Ingress, and all of th
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