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Setting up ExternalDNS using AWS Cloud Map API
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Setting up external-dns for BlueCat
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Setting up ExternalDNS for Services on Civo
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Setting up ExternalDNS for Services on Cloudflare
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Setting up External DNS with Contour
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Setting up ExternalDNS for CoreDNS with minikube
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Setting up ExternalDNS for Services on OpenStack Designate
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Setting up ExternalDNS for Services on DigitalOcean
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Setting up ExternalDNS for Services on DNSimple
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Setting up ExternalDNS for Dyn
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Setting up ExternalDNS for Services on Gandi
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Configuring ExternalDNS to use Gateway API Route Sources
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Setting up ExternalDNS on Google Kubernetes Engine
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Configuring ExternalDNS to use the Gloo Proxy Source
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Setting up ExternalDNS for Services on GoDaddy
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Setting up ExternalDNS for Headless Services
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Setting up ExternalDNS for Services on IBMCloud
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Setting up ExternalDNS for Infoblox
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<a href="../istio/" class="md-nav__link">
Configuring ExternalDNS to use the Istio Gateway and/or Istio Virtual Service Source
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<a href="../kong/" class="md-nav__link">
Configuring ExternalDNS to use the Kong TCPIngress Source
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kOps dns-controller compatibility mode
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Using ExternalDNS with kube-ingress-aws-controller
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Setting up ExternalDNS for Services on Linode
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Creating MX record with CRD source
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Setting up ExternalDNS on GKE with nginx-ingress-controller
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Configuring ExternalDNS to use Cluster Nodes as Source
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Creating NS record with CRD source
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Setting up ExternalDNS for Services on NS1
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Configuring ExternalDNS to use the OpenShift Route Source
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Setting up ExternalDNS for Oracle Cloud Infrastructure (OCI)
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Setting up ExternalDNS for Services on OVH
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Setting up ExternalDNS for PowerDNS
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Setting up ExternalDNS for Pi-hole
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Setting up ExternalDNS for Services on Plural
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Setting up ExternalDNS using the same domain for public and private Route53 zones
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Setting up ExternalDNS for Services on RcodeZero
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Setting up ExternalDNS for RancherDNS(RDNS) with kubernetes
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Configuring RFC2136 provider
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Setting up ExternalDNS for Services on Scaleway
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Running ExternalDNS with limited privileges
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Setting up ExternalDNS for Tencent Cloud
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Setting up ExternalDNS for Services on TransIP
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Setting up ExternalDNS for Services on UltraDNS
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Setting up ExternalDNS for VinylDNS
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Setting up ExternalDNS for Services on Vultr
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<h1 id="setting-up-externaldns-for-externalname-services">Setting up ExternalDNS for ExternalName Services<a class="headerlink" href="#setting-up-externaldns-for-externalname-services" title="Permanent link">&para;</a></h1>
<p>This tutorial describes how to setup ExternalDNS for usage in conjunction with an ExternalName service.</p>
<h2 id="use-cases">Use cases<a class="headerlink" href="#use-cases" title="Permanent link">&para;</a></h2>
<p>The main use cases that inspired this feature is the necessity for having a subdomain pointing to an external domain. In this scenario, it makes sense for the subdomain to have a CNAME record pointing to the external domain.</p>
<h2 id="setup">Setup<a class="headerlink" href="#setup" title="Permanent link">&para;</a></h2>
<h3 id="external-dns">External DNS<a class="headerlink" href="#external-dns" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">apps/v1</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Deployment</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="nt">metadata</span><span class="p">:</span>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-dns</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="nt">spec</span><span class="p">:</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="nt">strategy</span><span class="p">:</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Recreate</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="nt">selector</span><span class="p">:</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="nt">matchLabels</span><span class="p">:</span>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="nt">app</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-dns</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="nt">template</span><span class="p">:</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="nt">metadata</span><span class="p">:</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="nt">labels</span><span class="p">:</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="nt">app</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-dns</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="nt">spec</span><span class="p">:</span>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="w"> </span><span class="nt">containers</span><span class="p">:</span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-dns</span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="nt">image</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">registry.k8s.io/external-dns/external-dns:v0.13.4</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="nt">args</span><span class="p">:</span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--log-level=debug</span>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--source=service</span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--source=ingress</span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--namespace=dev</span>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--domain-filter=example.org.</span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--provider=aws</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--registry=txt</span>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">--txt-owner-id=dev.example.org</span>
</code></pre></div>
<h3 id="externalname-service">ExternalName Service<a class="headerlink" href="#externalname-service" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Service</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v1</span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="nt">metadata</span><span class="p">:</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">aws-service</span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="nt">annotations</span><span class="p">:</span>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="nt">external-dns.alpha.kubernetes.io/hostname</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">tenant1.example.org,tenant2.example.org</span>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="nt">spec</span><span class="p">:</span>
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalName</span>
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="w"> </span><span class="nt">externalName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">aws.example.org</span>
</code></pre></div>
<p>This will create 2 CNAME records pointing to <code>aws.example.org</code>:<br />
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>tenant1.example.org
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>tenant2.example.org
</code></pre></div></p>
<h3 id="externalname-service-with-an-ip-address">ExternalName Service with an IP address<a class="headerlink" href="#externalname-service-with-an-ip-address" title="Permanent link">&para;</a></h3>
<p>If <code>externalName</code> is an IP address, External DNS will create A records instead of CNAME.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Service</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v1</span>
<a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="nt">metadata</span><span class="p">:</span>
<a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="w"> </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">aws-service</span>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="nt">annotations</span><span class="p">:</span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="w"> </span><span class="nt">external-dns.alpha.kubernetes.io/hostname</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">tenant1.example.org,tenant2.example.org</span>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="nt">spec</span><span class="p">:</span>
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalName</span>
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="w"> </span><span class="nt">externalName</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">111.111.111.111</span>
</code></pre></div>
<p>This will create 2 A records pointing to <code>111.111.111.111</code>:<br />
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>tenant1.example.org
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>tenant2.example.org
</code></pre></div></p>
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