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<h1 id="crd-source">CRD Source<a class="headerlink" href="#crd-source" title="Permanent link">&para;</a></h1>
<p>CRD source provides a generic mechanism to manage DNS records in your favourite DNS provider supported by external-dns.</p>
<h3 id="details">Details<a class="headerlink" href="#details" title="Permanent link">&para;</a></h3>
<p>CRD source watches for a user specified CRD to extract <a href="https://github.com/kubernetes-sigs/external-dns/blob/HEAD/endpoint/endpoint.go">Endpoints</a> from its <code>Spec</code>.<br />
So users need to create such a CRD and register it to the kubernetes cluster and then create new object(s) of the CRD specifying the Endpoints.</p>
<h3 id="registering-crd">Registering CRD<a class="headerlink" href="#registering-crd" title="Permanent link">&para;</a></h3>
<p>Here is typical example of <a href="https://github.com/kubernetes-sigs/external-dns/blob/HEAD/endpoint/endpoint.go">CRD API type</a> which provides Endpoints to <code>CRD source</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kd">type</span><span class="w"> </span><span class="nx">TTL</span><span class="w"> </span><span class="kt">int64</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kd">type</span><span class="w"> </span><span class="nx">Targets</span><span class="w"> </span><span class="p">[]</span><span class="kt">string</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="kd">type</span><span class="w"> </span><span class="nx">ProviderSpecificProperty</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </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="nx">Name</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="s">`json:&quot;name,omitempty&quot;`</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="nx">Value</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="s">`json:&quot;value,omitempty&quot;`</span>
<a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="p">}</span>
<a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="kd">type</span><span class="w"> </span><span class="nx">ProviderSpecific</span><span class="w"> </span><span class="p">[]</span><span class="nx">ProviderSpecificProperty</span>
<a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="kd">type</span><span class="w"> </span><span class="nx">Labels</span><span class="w"> </span><span class="kd">map</span><span class="p">[</span><span class="kt">string</span><span class="p">]</span><span class="kt">string</span>
<a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>
<a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="kd">type</span><span class="w"> </span><span class="nx">Endpoint</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="c1">// The hostname of the DNS record</span>
<a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="nx">DNSName</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="s">`json:&quot;dnsName,omitempty&quot;`</span>
<a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="c1">// The targets the DNS record points to</span>
<a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="nx">Targets</span><span class="w"> </span><span class="nx">Targets</span><span class="w"> </span><span class="s">`json:&quot;targets,omitempty&quot;`</span>
<a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="c1">// RecordType type of record, e.g. CNAME, A, SRV, TXT etc</span>
<a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="w"> </span><span class="nx">RecordType</span><span class="w"> </span><span class="kt">string</span><span class="w"> </span><span class="s">`json:&quot;recordType,omitempty&quot;`</span>
<a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="c1">// TTL for the record</span>
<a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="nx">RecordTTL</span><span class="w"> </span><span class="nx">TTL</span><span class="w"> </span><span class="s">`json:&quot;recordTTL,omitempty&quot;`</span>
<a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="c1">// Labels stores labels defined for the Endpoint</span>
<a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="w"> </span><span class="c1">// +optional</span>
<a id="__codelineno-0-21" name="__codelineno-0-21" href="#__codelineno-0-21"></a><span class="w"> </span><span class="nx">Labels</span><span class="w"> </span><span class="nx">Labels</span><span class="w"> </span><span class="s">`json:&quot;labels,omitempty&quot;`</span>
<a id="__codelineno-0-22" name="__codelineno-0-22" href="#__codelineno-0-22"></a><span class="w"> </span><span class="c1">// ProviderSpecific stores provider specific config</span>
<a id="__codelineno-0-23" name="__codelineno-0-23" href="#__codelineno-0-23"></a><span class="w"> </span><span class="c1">// +optional</span>
<a id="__codelineno-0-24" name="__codelineno-0-24" href="#__codelineno-0-24"></a><span class="w"> </span><span class="nx">ProviderSpecific</span><span class="w"> </span><span class="nx">ProviderSpecific</span><span class="w"> </span><span class="s">`json:&quot;providerSpecific,omitempty&quot;`</span>
<a id="__codelineno-0-25" name="__codelineno-0-25" href="#__codelineno-0-25"></a><span class="p">}</span>
<a id="__codelineno-0-26" name="__codelineno-0-26" href="#__codelineno-0-26"></a>
<a id="__codelineno-0-27" name="__codelineno-0-27" href="#__codelineno-0-27"></a><span class="kd">type</span><span class="w"> </span><span class="nx">DNSEndpointSpec</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-28" name="__codelineno-0-28" href="#__codelineno-0-28"></a><span class="w"> </span><span class="nx">Endpoints</span><span class="w"> </span><span class="p">[]</span><span class="o">*</span><span class="nx">Endpoint</span><span class="w"> </span><span class="s">`json:&quot;endpoints,omitempty&quot;`</span>
<a id="__codelineno-0-29" name="__codelineno-0-29" href="#__codelineno-0-29"></a><span class="p">}</span>
<a id="__codelineno-0-30" name="__codelineno-0-30" href="#__codelineno-0-30"></a>
<a id="__codelineno-0-31" name="__codelineno-0-31" href="#__codelineno-0-31"></a><span class="kd">type</span><span class="w"> </span><span class="nx">DNSEndpointStatus</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-32" name="__codelineno-0-32" href="#__codelineno-0-32"></a><span class="w"> </span><span class="c1">// The generation observed by the external-dns controller.</span>
<a id="__codelineno-0-33" name="__codelineno-0-33" href="#__codelineno-0-33"></a><span class="w"> </span><span class="c1">// +optional</span>
<a id="__codelineno-0-34" name="__codelineno-0-34" href="#__codelineno-0-34"></a><span class="w"> </span><span class="nx">ObservedGeneration</span><span class="w"> </span><span class="kt">int64</span><span class="w"> </span><span class="s">`json:&quot;observedGeneration,omitempty&quot;`</span>
<a id="__codelineno-0-35" name="__codelineno-0-35" href="#__codelineno-0-35"></a><span class="p">}</span>
<a id="__codelineno-0-36" name="__codelineno-0-36" href="#__codelineno-0-36"></a>
<a id="__codelineno-0-37" name="__codelineno-0-37" href="#__codelineno-0-37"></a><span class="c1">// +genclient</span>
<a id="__codelineno-0-38" name="__codelineno-0-38" href="#__codelineno-0-38"></a><span class="c1">// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object</span>
<a id="__codelineno-0-39" name="__codelineno-0-39" href="#__codelineno-0-39"></a>
<a id="__codelineno-0-40" name="__codelineno-0-40" href="#__codelineno-0-40"></a><span class="c1">// DNSEndpoint is the CRD wrapper for Endpoint</span>
<a id="__codelineno-0-41" name="__codelineno-0-41" href="#__codelineno-0-41"></a><span class="c1">// +k8s:openapi-gen=true</span>
<a id="__codelineno-0-42" name="__codelineno-0-42" href="#__codelineno-0-42"></a><span class="c1">// +kubebuilder:resource:path=dnsendpoints</span>
<a id="__codelineno-0-43" name="__codelineno-0-43" href="#__codelineno-0-43"></a><span class="c1">// +kubebuilder:subresource:status</span>
<a id="__codelineno-0-44" name="__codelineno-0-44" href="#__codelineno-0-44"></a><span class="kd">type</span><span class="w"> </span><span class="nx">DNSEndpoint</span><span class="w"> </span><span class="kd">struct</span><span class="w"> </span><span class="p">{</span>
<a id="__codelineno-0-45" name="__codelineno-0-45" href="#__codelineno-0-45"></a><span class="w"> </span><span class="nx">metav1</span><span class="p">.</span><span class="nx">TypeMeta</span><span class="w"> </span><span class="s">`json:&quot;,inline&quot;`</span>
<a id="__codelineno-0-46" name="__codelineno-0-46" href="#__codelineno-0-46"></a><span class="w"> </span><span class="nx">metav1</span><span class="p">.</span><span class="nx">ObjectMeta</span><span class="w"> </span><span class="s">`json:&quot;metadata,omitempty&quot;`</span>
<a id="__codelineno-0-47" name="__codelineno-0-47" href="#__codelineno-0-47"></a>
<a id="__codelineno-0-48" name="__codelineno-0-48" href="#__codelineno-0-48"></a><span class="w"> </span><span class="nx">Spec</span><span class="w"> </span><span class="nx">DNSEndpointSpec</span><span class="w"> </span><span class="s">`json:&quot;spec,omitempty&quot;`</span>
<a id="__codelineno-0-49" name="__codelineno-0-49" href="#__codelineno-0-49"></a><span class="w"> </span><span class="nx">Status</span><span class="w"> </span><span class="nx">DNSEndpointStatus</span><span class="w"> </span><span class="s">`json:&quot;status,omitempty&quot;`</span>
<a id="__codelineno-0-50" name="__codelineno-0-50" href="#__codelineno-0-50"></a><span class="p">}</span>
</code></pre></div>
<p>Refer to <a href="https://github.com/kubernetes-sigs/kubebuilder">kubebuilder</a> to create and register the CRD.</p>
<h3 id="usage">Usage<a class="headerlink" href="#usage" title="Permanent link">&para;</a></h3>
<p>One can use CRD source by specifying <code>--source</code> flag with <code>crd</code> and specifying the ApiVersion and Kind of the CRD with <code>--crd-source-apiversion</code> and <code>crd-source-kind</code> respectively.<br />
for e.g:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>$ build/external-dns --source crd --crd-source-apiversion externaldns.k8s.io/v1alpha1 --crd-source-kind DNSEndpoint --provider inmemory --once --dry-run
</code></pre></div>
<h3 id="creating-dns-records">Creating DNS Records<a class="headerlink" href="#creating-dns-records" title="Permanent link">&para;</a></h3>
<p>Create the objects of CRD type by filling in the fields of CRD and DNS record would be created accordingly.</p>
<h3 id="example">Example<a class="headerlink" href="#example" title="Permanent link">&para;</a></h3>
<p>Here is an example <a href="crd-manifest.yaml">CRD manifest</a> generated by kubebuilder.<br />
Apply this to register the CRD</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>$ kubectl apply --validate=false -f docs/contributing/crd-source/crd-manifest.yaml
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>customresourcedefinition.apiextensions.k8s.io &quot;dnsendpoints.externaldns.k8s.io&quot; created
</code></pre></div>
<p>Then you can create the dns-endpoint yaml similar to <a href="dnsendpoint-example.yaml">dnsendpoint-example</a></p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>$ kubectl apply -f docs/contributing/crd-source/dnsendpoint-example.yaml
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>dnsendpoint.externaldns.k8s.io &quot;examplednsrecord&quot; created
</code></pre></div>
<p>Run external-dns in dry-mode to see whether external-dns picks up the DNS record from CRD.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>$ build/external-dns --source crd --crd-source-apiversion externaldns.k8s.io/v1alpha1 --crd-source-kind DNSEndpoint --provider inmemory --once --dry-run
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>INFO[0000] running in dry-run mode. No changes to DNS records will be made.
<a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a>INFO[0000] Connected to cluster at https://192.168.99.100:8443
<a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a>INFO[0000] CREATE: foo.bar.com 180 IN A 192.168.99.216
<a id="__codelineno-4-5" name="__codelineno-4-5" href="#__codelineno-4-5"></a>INFO[0000] CREATE: foo.bar.com 0 IN TXT &quot;heritage=external-dns,external-dns/owner=default&quot;
</code></pre></div>
<h3 id="rbac-configuration">RBAC configuration<a class="headerlink" href="#rbac-configuration" title="Permanent link">&para;</a></h3>
<p>If you use RBAC, extend the <code>external-dns</code> ClusterRole with:<br />
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>- apiGroups: [&quot;externaldns.k8s.io&quot;]
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a> resources: [&quot;dnsendpoints&quot;]
<a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a> verbs: [&quot;get&quot;,&quot;watch&quot;,&quot;list&quot;]
<a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a>- apiGroups: [&quot;externaldns.k8s.io&quot;]
<a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a> resources: [&quot;dnsendpoints/status&quot;]
<a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a> verbs: [&quot;*&quot;]
</code></pre></div></p>
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