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Exposing TCP and UDP services
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<a href="https://github.com/kubernetes/ingress-nginx/edit/master/docs/user-guide/exposing-tcp-udp-services.md" title="Edit this page" class="md-icon md-content__icon"></a>
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<h1 id="exposing-tcp-and-udp-services">Exposing TCP and UDP services<a class="headerlink" href="#exposing-tcp-and-udp-services" title="Permanent link">¶</a></h1>
|
||
<p>Ingress does not support TCP or UDP services. For this reason this Ingress controller uses the flags <code class="codehilite">--tcp-services-configmap</code> and <code class="codehilite">--udp-services-configmap</code> to point to an existing config map where the key is the external port to use and the value indicates the service to expose using the format:
|
||
<code class="codehilite"><namespace/service name>:<service port>:[PROXY]:[PROXY]</code></p>
|
||
<p>It is also possible to use a number or the name of the port. The two last fields are optional.
|
||
Adding <code class="codehilite">PROXY</code> in either or both of the two last fields we can use Proxy Protocol decoding (listen) and/or encoding (proxy_pass) in a TCP service (https://www.nginx.com/resources/admin-guide/proxy-protocol/).</p>
|
||
<p>The next example shows how to expose the service <code class="codehilite">example-go</code> running in the namespace <code class="codehilite">default</code> in the port <code class="codehilite">8080</code> using the port <code class="codehilite">9000</code></p>
|
||
<div class="codehilite"><pre><span></span><span class="l l-Scalar l-Scalar-Plain">apiVersion</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">v1</span>
|
||
<span class="l l-Scalar l-Scalar-Plain">kind</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">ConfigMap</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">tcp-services</span>
|
||
<span class="l l-Scalar l-Scalar-Plain">namespace</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
|
||
<span class="l l-Scalar l-Scalar-Plain">data</span><span class="p p-Indicator">:</span>
|
||
<span class="l l-Scalar l-Scalar-Plain">9000</span><span class="p p-Indicator">:</span> <span class="s">"default/example-go:8080"</span>
|
||
</pre></div>
|
||
|
||
|
||
<p>Since 1.9.13 NGINX provides <a href="https://www.nginx.com/blog/announcing-udp-load-balancing/">UDP Load Balancing</a>.
|
||
The next example shows how to expose the service <code class="codehilite">kube-dns</code> running in the namespace <code class="codehilite">kube-system</code> in the port <code class="codehilite">53</code> using the port <code class="codehilite">53</code></p>
|
||
<div class="codehilite"><pre><span></span><span class="l l-Scalar l-Scalar-Plain">apiVersion</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">v1</span>
|
||
<span class="l l-Scalar l-Scalar-Plain">kind</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">ConfigMap</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">udp-services</span>
|
||
<span class="l l-Scalar l-Scalar-Plain">namespace</span><span class="p p-Indicator">:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
|
||
<span class="l l-Scalar l-Scalar-Plain">data</span><span class="p p-Indicator">:</span>
|
||
<span class="err"> </span><span class="l l-Scalar l-Scalar-Plain">53</span><span class="p p-Indicator">:</span> <span class="s">"kube-system/kube-dns:53"</span>
|
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</pre></div>
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