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</nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle" data-md-toggle=nav-5 type=checkbox id=nav-5> <label class=md-nav__link for=nav-5> Developer Guide <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav aria-label="Developer Guide" data-md-level=1> <label class=md-nav__title for=nav-5> <span class="md-nav__icon md-icon"></span> Developer Guide </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../developer-guide/getting-started/ class=md-nav__link> Getting Started </a> </li> <li class=md-nav__item> <a href=../../developer-guide/code-overview/ class=md-nav__link> Code Overview </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../../faq/ class=md-nav__link> FAQ </a> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component=toc> <div class=md-sidebar__scrollwrap> <div class=md-sidebar__inner> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> </nav> </div> </div> </div> <div class=md-content> <article class="md-content__inner md-typeset"> <a href=https://github.com/kubernetes/ingress-nginx/edit/main/docs/user-guide/exposing-tcp-udp-services.md title="Edit this page" class="md-content__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z"/></svg> </a> <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>--tcp-services-configmap</code> and <code>--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><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>PROXY</code> in either or both of the two last fields we can use <a href=https://www.nginx.com/resources/admin-guide/proxy-protocol>Proxy Protocol</a> decoding (listen) and/or encoding (proxy_pass) in a TCP service. The first <code>PROXY</code> controls the decode of the proxy protocol and the second <code>PROXY</code> controls the encoding using proxy protocol. This allows an incoming connection to be decoded or an outgoing connection to be encoded. It is also possible to arbitrate between two different proxies by turning on the decode and encode on a TCP service. </p> <p>The next example shows how to expose the service <code>example-go</code> running in the namespace <code>default</code> in the port <code>8080</code> using the port <code>9000</code></p> <div class=highlight><pre><span></span><code><span class=nt>apiVersion</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">v1</span>
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<span class=nt>kind</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ConfigMap</span>
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<span class=nt>metadata</span><span class=p>:</span>
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<span class=nt>name</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">tcp-services</span>
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<span class=nt>namespace</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
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<span class=nt>data</span><span class=p>:</span>
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<span class=nt>9000</span><span class=p>:</span> <span class=s>"default/example-go:8080"</span>
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</code></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>kube-dns</code> running in the namespace <code>kube-system</code> in the port <code>53</code> using the port <code>53</code></p> <div class=highlight><pre><span></span><code><span class=nt>apiVersion</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">v1</span>
|
|
<span class=nt>kind</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ConfigMap</span>
|
|
<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">udp-services</span>
|
|
<span class=nt>namespace</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
|
|
<span class=nt>data</span><span class=p>:</span>
|
|
<span class=nt>53</span><span class=p>:</span> <span class=s>"kube-system/kube-dns:53"</span>
|
|
</code></pre></div> <p>If TCP/UDP proxy support is used, then those ports need to be exposed in the Service defined for the Ingress.</p> <p><div class=highlight><pre><span></span><code><span class=nt>apiVersion</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">v1</span>
|
|
<span class=nt>kind</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">Service</span>
|
|
<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">ingress-nginx</span>
|
|
<span class=nt>namespace</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
|
|
<span class=nt>labels</span><span class=p>:</span>
|
|
<span class=nt>app.kubernetes.io/name</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
|
|
<span class=nt>app.kubernetes.io/part-of</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
|
|
<span class=nt>spec</span><span class=p>:</span>
|
|
<span class=nt>type</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">LoadBalancer</span>
|
|
<span class=nt>ports</span><span class=p>:</span>
|
|
<span class="p p-Indicator">-</span> <span class=nt>name</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">http</span>
|
|
<span class=nt>port</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">80</span>
|
|
<span class=nt>targetPort</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">80</span>
|
|
<span class=nt>protocol</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">TCP</span>
|
|
<span class="p p-Indicator">-</span> <span class=nt>name</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">https</span>
|
|
<span class=nt>port</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">443</span>
|
|
<span class=nt>targetPort</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">443</span>
|
|
<span class=nt>protocol</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">TCP</span>
|
|
<span class="p p-Indicator">-</span> <span class=nt>name</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">proxied-tcp-9000</span>
|
|
<span class=nt>port</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">9000</span>
|
|
<span class=nt>targetPort</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">9000</span>
|
|
<span class=nt>protocol</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">TCP</span>
|
|
<span class=nt>selector</span><span class=p>:</span>
|
|
<span class=nt>app.kubernetes.io/name</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
|
|
<span class=nt>app.kubernetes.io/part-of</span><span class=p>:</span> <span class="l l-Scalar l-Scalar-Plain">ingress-nginx</span>
|
|
</code></pre></div> Then, the configmap should be added into ingress controller's deployment args. <div class=highlight><pre><span></span><code> args:
|
|
- /nginx-ingress-controller
|
|
- --tcp-services-configmap=ingress-nginx/tcp-services
|
|
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