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3399 lines
62 KiB
HTML
3399 lines
62 KiB
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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<script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce((e,_)=>(e<<5)-e+_.charCodeAt(0),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href="../../.." title="external-dns" class="md-header__button md-logo" aria-label="external-dns" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54Z"/></svg>
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<div class="md-header__ellipsis">
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external-dns
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<div class="md-header__topic" data-md-component="header-topic">
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<span class="md-ellipsis">
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Service source
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kubernetes-sigs/external-dns
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Tutorials
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54Z"/></svg>
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external-dns
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.5.1 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2023 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
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kubernetes-sigs/external-dns
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Chart
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|
Pi-hole
|
|
</span>
|
|
|
|
|
|
</a>
|
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</li>
|
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|
|
<li class="md-nav__item">
|
|
<a href="../../tutorials/plural/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Plural
|
|
</span>
|
|
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|
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</a>
|
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</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../../tutorials/rfc2136/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
RFC2136 provider
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
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|
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|
|
<li class="md-nav__item">
|
|
<a href="../../tutorials/scaleway/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Scaleway
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
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|
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<li class="md-nav__item">
|
|
<a href="../../tutorials/security-context/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Running ExternalDNS with limited privileges
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
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<li class="md-nav__item">
|
|
<a href="../../tutorials/transip/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
TransIP
|
|
</span>
|
|
|
|
|
|
</a>
|
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</li>
|
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|
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<li class="md-nav__item">
|
|
<a href="../../tutorials/webhook-provider/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Webhook provider
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
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|
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</li>
|
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|
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<li class="md-nav__item md-nav__item--nested">
|
|
|
|
|
|
|
|
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5" >
|
|
|
|
|
|
<label class="md-nav__link" for="__nav_5" id="__nav_5_label" tabindex="0">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Annotations
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="false">
|
|
<label class="md-nav__title" for="__nav_5">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Annotations
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../../annotations/annotations/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
About
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
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|
|
</li>
|
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|
|
<li class="md-nav__item md-nav__item--active md-nav__item--section md-nav__item--nested">
|
|
|
|
|
|
|
|
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" checked>
|
|
|
|
|
|
<label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Sources
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="true">
|
|
<label class="md-nav__title" for="__nav_6">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Sources
|
|
</label>
|
|
<ul class="md-nav__list" data-md-scrollfix>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../about/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
About
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../crd/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
CRD Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../f5-transportserver/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
F5 Networks TransportServer Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../f5-virtualserver/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
F5 Networks VirtualServer Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../gateway-api/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Gateway API Route Sources
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../gateway/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Gateway sources
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../gloo-proxy/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Gloo Proxy Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../ingress/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Ingress source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../istio/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Istio Gateway / Virtual Service Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../kong/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Kong TCPIngress Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../mx-record/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
MX record with CRD source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../nodes/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Cluster Nodes as Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../ns-record/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
NS record with CRD source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../openshift/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
OpenShift Route Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../pod/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Pod Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item md-nav__item--active">
|
|
|
|
<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
|
|
|
|
|
|
|
|
|
|
|
|
<label class="md-nav__link md-nav__link--active" for="__toc">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Service source
|
|
</span>
|
|
|
|
|
|
<span class="md-nav__icon md-icon"></span>
|
|
</label>
|
|
|
|
<a href="./" class="md-nav__link md-nav__link--active">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Service source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<label class="md-nav__title" for="__toc">
|
|
<span class="md-nav__icon md-icon"></span>
|
|
Table of contents
|
|
</label>
|
|
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#filtering-the-services-considered" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Filtering the Services considered
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#domain-names" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Domain names
|
|
</span>
|
|
</a>
|
|
|
|
<nav class="md-nav" aria-label="Domain names">
|
|
<ul class="md-nav__list">
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#domain-names-for-headless-service-pods" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Domain names for headless service pods
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
</nav>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#targets" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Targets
|
|
</span>
|
|
</a>
|
|
|
|
<nav class="md-nav" aria-label="Targets">
|
|
<ul class="md-nav__list">
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#loadbalancer" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
LoadBalancer
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#clusterip-headless" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
ClusterIP (headless)
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#clusterip-not-headless" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
ClusterIP (not headless)
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#nodeport" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
NodePort
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#externalname" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
ExternalName
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
</nav>
|
|
|
|
</li>
|
|
|
|
<li class="md-nav__item">
|
|
<a href="#endpoints-reconciliation" class="md-nav__link">
|
|
<span class="md-ellipsis">
|
|
Endpoints Reconciliation
|
|
</span>
|
|
</a>
|
|
|
|
</li>
|
|
|
|
</ul>
|
|
|
|
</nav>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../traefik-proxy/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Traefik Proxy Source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item">
|
|
<a href="../txt-record/" class="md-nav__link">
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
Creating TXT record with CRD source
|
|
</span>
|
|
|
|
|
|
</a>
|
|
</li>
|
|
|
|
|
|
|
|
|
|
</ul>
|
|
</nav>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
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|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="md-nav__item md-nav__item--nested">
|
|
|
|
|
|
|
|
<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7" >
|
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</a>
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</ul>
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</div>
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</div>
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<span class="md-nav__icon md-icon"></span>
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<span class="md-ellipsis">
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Filtering the Services considered
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Targets
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<span class="md-ellipsis">
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LoadBalancer
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</a>
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<li class="md-nav__item">
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<span class="md-ellipsis">
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ClusterIP (headless)
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<span class="md-ellipsis">
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ClusterIP (not headless)
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#nodeport" class="md-nav__link">
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<span class="md-ellipsis">
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NodePort
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</span>
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</a>
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ExternalName
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Endpoints Reconciliation
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<h1 id="service-source">Service source<a class="headerlink" href="#service-source" title="Permanent link">¶</a></h1>
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<p>The service source creates DNS entries based on <code>Service</code> resources.</p>
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<h2 id="filtering-the-services-considered">Filtering the Services considered<a class="headerlink" href="#filtering-the-services-considered" title="Permanent link">¶</a></h2>
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<p>The <code>--service-type-filter</code> flag filters Service resources by their <code>spec.type</code>.<br />
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The flag may be specified multiple times to allow multiple service types.</p>
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<p>This source supports the <code>--label-filter</code> flag, which filters Service resources<br />
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by a set of labels.</p>
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<h2 id="domain-names">Domain names<a class="headerlink" href="#domain-names" title="Permanent link">¶</a></h2>
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<p>The domain names of the DNS entries created from a Service are sourced from the following places:</p>
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<ol>
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<li>
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<p>Adds the domain names from any <code>external-dns.alpha.kubernetes.io/hostname</code> and/or<br />
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<code>external-dns.alpha.kubernetes.io/internal-hostname</code> annotation.<br />
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This behavior is suppressed if the <code>--ignore-hostname-annotation</code> flag was specified.</p>
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</li>
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<li>
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<p>If no DNS entries were produced for a Service by the previous steps<br />
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and the <code>--compatibility</code> flag was specified, then adds DNS entries per the<br />
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selected compatibility mode.</p>
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</li>
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<li>
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<p>If no DNS entries were produced for a Service by the previous steps<br />
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or the <code>--combine-fqdn-annotation</code> flag was specified, then adds domain names<br />
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generated from any<code>--fqdn-template</code> flag.</p>
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</li>
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</ol>
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<h3 id="domain-names-for-headless-service-pods">Domain names for headless service pods<a class="headerlink" href="#domain-names-for-headless-service-pods" title="Permanent link">¶</a></h3>
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<p>If a headless Service (without an <code>external-dns.alpha.kubernetes.io/target</code> annotation) creates DNS entries with targets from<br />
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a Pod that has a non-empty <code>spec.hostname</code> field, additional DNS entries are created for that Pod, containing the targets from that Pod.<br />
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For each domain name created for the Service, the additional DNS entry for the Pod has that domain name prefixed with<br />
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the value of the Pod’s <code>spec.hostname</code> field and a <code>.</code>.</p>
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<h2 id="targets">Targets<a class="headerlink" href="#targets" title="Permanent link">¶</a></h2>
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<p>If the Service has an <code>external-dns.alpha.kubernetes.io/target</code> annotation, uses<br />
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the values from that. Otherwise, the targets of the DNS entries created from a service are sourced depending<br />
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on the Service’s <code>spec.type</code>:</p>
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<h3 id="loadbalancer">LoadBalancer<a class="headerlink" href="#loadbalancer" title="Permanent link">¶</a></h3>
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<ol>
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<li>
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<p>If the hostname came from an <code>external-dns.alpha.kubernetes.io/internal-hostname</code> annotation, uses<br />
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the Service’s <code>spec.clusterIP</code> field. If that field has the value <code>None</code>, does not generate<br />
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any targets for the hostname.</p>
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</li>
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<li>
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<p>Otherwise, if the Service has one or more <code>spec.externalIPs</code>, uses the values in that field.</p>
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</li>
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<li>
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<p>Otherwise, iterates over each <code>status.loadBalancer.ingress</code>, adding any non-empty <code>ip</code> and/or <code>hostname</code>.</p>
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</li>
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</ol>
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<p>If the <code>--resolve-service-load-balancer-hostname</code> flag was specified, any non-empty <code>hostname</code><br />
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is queried through DNS and any resulting IP addresses are added instead.<br />
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A DNS query failure results in zero targets being added for that load balancer’s ingress hostname.</p>
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<h3 id="clusterip-headless">ClusterIP (headless)<a class="headerlink" href="#clusterip-headless" title="Permanent link">¶</a></h3>
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<p>Iterates over all of the Service’s Endpoints’s <code>subsets.addresses</code>.<br />
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If the Service’s <code>spec.publishNotReadyAddresses</code> is <code>true</code> or the <code>--always-publish-not-ready-addresses</code> flag is specified,<br />
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also iterates over the Endpoints’s <code>subsets.notReadyAddresses</code>.</p>
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<ol>
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<li>
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<p>If an address does not target a <code>Pod</code> that matches the Service’s <code>spec.selector</code>, it is ignored.</p>
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</li>
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<li>
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<p>If the target pod has an <code>external-dns.alpha.kubernetes.io/target</code> annotation, uses<br />
|
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the values from that.</p>
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</li>
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<li>
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<p>Otherwise, if the Service has an <code>external-dns.alpha.kubernetes.io/endpoints-type: NodeExternalIP</code><br />
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annotation, uses the addresses from the Pod’s Node’s <code>status.addresses</code> that are either of type<br />
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<code>ExternalIP</code> or IPv6 addresses of type <code>InternalIP</code>.</p>
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</li>
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<li>
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<p>Otherwise, if the Service has an <code>external-dns.alpha.kubernetes.io/endpoints-type: HostIP</code> annotation<br />
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or the <code>--publish-host-ip</code> flag was specified, uses the Pod’s <code>status.hostIP</code> field.</p>
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</li>
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<li>
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<p>Otherwise uses the <code>ip</code> field of the address from the Endpoints.</p>
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</li>
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</ol>
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<h3 id="clusterip-not-headless">ClusterIP (not headless)<a class="headerlink" href="#clusterip-not-headless" title="Permanent link">¶</a></h3>
|
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<ol>
|
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<li>
|
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<p>If the hostname came from an <code>external-dns.alpha.kubernetes.io/internal-hostname</code> annotation<br />
|
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or the <code>--publish-internal-services</code> flag was specified, uses the <code>spec.ClusterIP</code>.</p>
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</li>
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<li>
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<p>Otherwise, does not create any targets.</p>
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</li>
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</ol>
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<h3 id="nodeport">NodePort<a class="headerlink" href="#nodeport" title="Permanent link">¶</a></h3>
|
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<p>If <code>spec.ExternalTrafficPolicy</code> is <code>Local</code>, iterates over each Node that both matches the Service’s <code>spec.selector</code><br />
|
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and has a <code>status.phase</code> of <code>Running</code>. Otherwise iterates over all Nodes, of any phase.</p>
|
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<p>Iterates over each relevant Node’s <code>status.addresses</code>:</p>
|
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<ol>
|
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<li>
|
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<p>If there is an <code>external-dns.alpha.kubernetes.io/access: public</code> annotation on the Service, uses both addresses with<br />
|
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a <code>type</code> of <code>ExternalIP</code> and IPv6 addresses with a <code>type</code> of <code>InternalIP</code>.</p>
|
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</li>
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<li>
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<p>Otherwise, if there is an <code>external-dns.alpha.kubernetes.io/access: private</code> annotation on the Service, uses addresses with<br />
|
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a <code>type</code> of <code>InternalIP</code>.</p>
|
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</li>
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<li>
|
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<p>Otherwise, if there is at least one address with a <code>type</code> of <code>ExternalIP</code>, uses both addresses with<br />
|
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a <code>type</code> of <code>ExternalIP</code> and IPv6 addresses with a <code>type</code> of <code>InternalIP</code>.</p>
|
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</li>
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<li>
|
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<p>Otherwise, uses addresses with a <code>type</code> of <code>InternalIP</code>.</p>
|
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</li>
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</ol>
|
|
<p>Also iterates over the Service’s <code>spec.ports</code>, creating a SRV record for each port which has a <code>nodePort</code>.<br />
|
|
The SRV record has a service of the Service’s <code>name</code>, a protocol taken from the port’s <code>protocol</code> field,<br />
|
|
a priority of <code>0</code> and a weight of <code>50</code>.<br />
|
|
In order for SRV records to be created, the <code>--managed-record-types</code> must have been specified, including <code>SRV</code><br />
|
|
as one of the values.</p>
|
|
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="go">external-dns ... --managed-record-types=A --managed-record-types=CNAME --managed-record-types=SRV</span>
|
|
</code></pre></div>
|
|
<h3 id="externalname">ExternalName<a class="headerlink" href="#externalname" title="Permanent link">¶</a></h3>
|
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<ol>
|
|
<li>If the Service has one or more <code>spec.externalIPs</code>, uses the values in that field.</li>
|
|
<li>Otherwise, creates a target with the value of the Service’s <code>externalName</code> field.</li>
|
|
</ol>
|
|
<h2 id="endpoints-reconciliation">Endpoints Reconciliation<a class="headerlink" href="#endpoints-reconciliation" title="Permanent link">¶</a></h2>
|
|
<p>By default, ExternalDNS does not watch for endpoint changes and does not automatically reconcile DNS records as the endpoints, as matched by the Service’s selector.<br />
|
|
To enable reconcile on endpoints changes, you must specify the <code>--listen-endpoint-events</code> flag. However, be aware that this may increase the number of reconciliations performed by the controller, and the number of requests to the DNS provider.</p>
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<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">February 18, 2025</span>
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