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<h1 id="ionos-cloud">IONOS Cloud<a class="headerlink" href="#ionos-cloud" title="Permanent link">&para;</a></h1>
<p>This tutorial describes how to set up ExternalDNS for use within a Kubernetes cluster using IONOS Cloud DNS.<br />
For more details, visit the <a href="https://github.com/ionos-cloud/external-dns-ionos-webhook">IONOS external-dns webhook repository</a>.<br />
You can also find the <a href="https://github.com/ionos-cloud/external-dns-ionos-webhook/pkgs/container/external-dns-ionos-webhook">external-dns-ionos-webhook container image</a> required for this setup.</p>
<h2 id="creating-a-dns-zone-with-ionos-cloud-dns">Creating a DNS Zone with IONOS Cloud DNS<a class="headerlink" href="#creating-a-dns-zone-with-ionos-cloud-dns" title="Permanent link">&para;</a></h2>
<p>If you are new to IONOS Cloud DNS, we recommend you first read the following instructions for creating a DNS zone:</p>
<ul>
<li><a href="https://docs.ionos.com/cloud/network-services/cloud-dns/dcd-how-tos/manage-dns-zone">Manage DNS Zones in Data Centre Designer</a></li>
<li><a href="https://docs.ionos.com/cloud/network-services/cloud-dns/api-how-tos/create-dns-zone">Creating a DNS Zone using the IONOS Cloud DNS API</a></li>
</ul>
<h3 id="steps-to-create-a-dns-zone">Steps to Create a DNS Zone<a class="headerlink" href="#steps-to-create-a-dns-zone" title="Permanent link">&para;</a></h3>
<ol>
<li>Log in to the <a href="https://dcd.ionos.com/">IONOS Cloud Data Center Designer</a>.</li>
<li>Navigate to the <strong>Network Services</strong> section and select <strong>Cloud DNS</strong>.</li>
<li>Click on <strong>Create Zone</strong> and provide the following details:<br />
- <strong>Zone Name</strong>: Enter the domain name (e.g., <code>example.com</code>).<br />
- <strong>Description</strong>: It is optional to provide a description of your zone.</li>
<li>Save the zone configuration.</li>
</ol>
<p>For more advanced configurations, such as adding records or managing subdomains, refer to the <a href="https://docs.ionos.com/cloud/network-services/cloud-dns/">IONOS Cloud DNS Documentation</a>.</p>
<h2 id="creating-an-ionos-api-token">Creating an IONOS API Token<a class="headerlink" href="#creating-an-ionos-api-token" title="Permanent link">&para;</a></h2>
<p>To use ExternalDNS with IONOS Cloud DNS, you need an API token with sufficient privileges to manage DNS zones and records. Follow these steps to create an API token:</p>
<ol>
<li>Log in to the <a href="https://dcd.ionos.com/">IONOS Cloud Data Center Designer</a>.</li>
<li>Navigate to the <strong>Management</strong> section in the top right corner and select <strong>Token Manager</strong>.</li>
<li>Select the Time To Live(TTL) of the token and click on <strong>Create Token</strong>.</li>
<li>Copy the generated token and store it securely. You will use this token to authenticate ExternalDNS.</li>
</ol>
<h2 id="deploy-externaldns">Deploy ExternalDNS<a class="headerlink" href="#deploy-externaldns" title="Permanent link">&para;</a></h2>
<h3 id="step-1-create-a-kubernetes-secret-for-the-ionos-api-token">Step 1: Create a Kubernetes Secret for the IONOS API Token<a class="headerlink" href="#step-1-create-a-kubernetes-secret-for-the-ionos-api-token" title="Permanent link">&para;</a></h3>
<p>Store your IONOS API token securely in a Kubernetes secret:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>kubectl<span class="w"> </span>create<span class="w"> </span>secret<span class="w"> </span>generic<span class="w"> </span>ionos-credentials<span class="w"> </span>--from-literal<span class="o">=</span>api-key<span class="o">=</span><span class="s1">&#39;&lt;IONOS_API_TOKEN&gt;&#39;</span>
</code></pre></div>
<p>Replace <code>&lt;IONOS_API_TOKEN&gt;</code> with your actual IONOS API token.</p>
<h3 id="step-2-configure-externaldns">Step 2: Configure ExternalDNS<a class="headerlink" href="#step-2-configure-externaldns" title="Permanent link">&para;</a></h3>
<p>Create a Helm values file for the ExternalDNS Helm chart that includes the webhook configuration. In this example, the values file is called <code>external-dns-ionos-values.yaml</code> .</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="nt">logLevel</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">debug</span><span class="w"> </span><span class="c1"># ExternalDNS Log level, reduce in production</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="nt">namespaced</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">false</span><span class="w"> </span><span class="c1"># if true, ExternalDNS will run in a namespaced scope (Role and Rolebinding will be namespaced too).</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="nt">triggerLoopOnEvent</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">true</span><span class="w"> </span><span class="c1"># if true, ExternalDNS will trigger a loop on every event (create/update/delete) on the resources it watches.</span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="nt">logLevel</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">debug</span>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="nt">sources</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="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ingress</span>
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">service</span>
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="nt">provider</span><span class="p">:</span>
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></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">webhook</span>
<a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="w"> </span><span class="nt">webhook</span><span class="p">:</span>
<a id="__codelineno-1-13" name="__codelineno-1-13" href="#__codelineno-1-13"></a><span class="w"> </span><span class="nt">image</span><span class="p">:</span>
<a id="__codelineno-1-14" name="__codelineno-1-14" href="#__codelineno-1-14"></a><span class="w"> </span><span class="nt">repository</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ghcr.io/ionos-cloud/external-dns-ionos-webhook</span>
<a id="__codelineno-1-15" name="__codelineno-1-15" href="#__codelineno-1-15"></a><span class="w"> </span><span class="nt">tag</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">latest</span>
<a id="__codelineno-1-16" name="__codelineno-1-16" href="#__codelineno-1-16"></a><span class="w"> </span><span class="nt">pullPolicy</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">IfNotPresent</span>
<a id="__codelineno-1-17" name="__codelineno-1-17" href="#__codelineno-1-17"></a><span class="w"> </span><span class="nt">env</span><span class="p">:</span>
<a id="__codelineno-1-18" name="__codelineno-1-18" href="#__codelineno-1-18"></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">IONOS_API_KEY</span>
<a id="__codelineno-1-19" name="__codelineno-1-19" href="#__codelineno-1-19"></a><span class="w"> </span><span class="nt">valueFrom</span><span class="p">:</span>
<a id="__codelineno-1-20" name="__codelineno-1-20" href="#__codelineno-1-20"></a><span class="w"> </span><span class="nt">secretKeyRef</span><span class="p">:</span>
<a id="__codelineno-1-21" name="__codelineno-1-21" href="#__codelineno-1-21"></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">ionos-credentials</span>
<a id="__codelineno-1-22" name="__codelineno-1-22" href="#__codelineno-1-22"></a><span class="w"> </span><span class="nt">key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">api-key</span>
<a id="__codelineno-1-23" name="__codelineno-1-23" href="#__codelineno-1-23"></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">SERVER_PORT</span>
<a id="__codelineno-1-24" name="__codelineno-1-24" href="#__codelineno-1-24"></a><span class="w"> </span><span class="nt">value</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;8888&quot;</span>
<a id="__codelineno-1-25" name="__codelineno-1-25" href="#__codelineno-1-25"></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">METRICS_PORT</span>
<a id="__codelineno-1-26" name="__codelineno-1-26" href="#__codelineno-1-26"></a><span class="w"> </span><span class="nt">value</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;8080&quot;</span>
<a id="__codelineno-1-27" name="__codelineno-1-27" href="#__codelineno-1-27"></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">DRY_RUN</span>
<a id="__codelineno-1-28" name="__codelineno-1-28" href="#__codelineno-1-28"></a><span class="w"> </span><span class="nt">value</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;false&quot;</span>
</code></pre></div>
<h3 id="step-3-install-externaldns-using-helm">Step 3: Install ExternalDNS Using Helm<a class="headerlink" href="#step-3-install-externaldns-using-helm" title="Permanent link">&para;</a></h3>
<p>Install ExternalDNS with the IONOS webhook provider:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>helm<span class="w"> </span>repo<span class="w"> </span>add<span class="w"> </span>external-dns<span class="w"> </span>https://kubernetes-sigs.github.io/external-dns/
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>helm<span class="w"> </span>upgrade<span class="w"> </span>--install<span class="w"> </span>external-dns<span class="w"> </span>external-dns/external-dns<span class="w"> </span>-f<span class="w"> </span>external-dns-ionos-values.yaml
</code></pre></div>
<h2 id="deploying-an-example-application">Deploying an Example Application<a class="headerlink" href="#deploying-an-example-application" title="Permanent link">&para;</a></h2>
<h3 id="step-1-create-a-deployment">Step 1: Create a Deployment<a class="headerlink" href="#step-1-create-a-deployment" title="Permanent link">&para;</a></h3>
<p>In this step we will create <code>echoserver</code> application manifest with the following content:</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">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">apps/v1</span>
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></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-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">echoserver</span>
<a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a><span class="w"> </span><span class="nt">namespace</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">default</span>
<a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a><span class="nt">spec</span><span class="p">:</span>
<a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a><span class="w"> </span><span class="nt">replicas</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span>
<a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a><span class="w"> </span><span class="nt">selector</span><span class="p">:</span>
<a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a><span class="w"> </span><span class="nt">matchLabels</span><span class="p">:</span>
<a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></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">echoserver</span>
<a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="w"> </span><span class="nt">template</span><span class="p">:</span>
<a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="w"> </span><span class="nt">metadata</span><span class="p">:</span>
<a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a><span class="w"> </span><span class="nt">labels</span><span class="p">:</span>
<a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></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">echoserver</span>
<a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a><span class="w"> </span><span class="nt">spec</span><span class="p">:</span>
<a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a><span class="w"> </span><span class="nt">containers</span><span class="p">:</span>
<a id="__codelineno-3-17" name="__codelineno-3-17" href="#__codelineno-3-17"></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">echoserver</span>
<a id="__codelineno-3-18" name="__codelineno-3-18" href="#__codelineno-3-18"></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">ealen/echo-server:latest</span>
<a id="__codelineno-3-19" name="__codelineno-3-19" href="#__codelineno-3-19"></a><span class="w"> </span><span class="nt">ports</span><span class="p">:</span>
<a id="__codelineno-3-20" name="__codelineno-3-20" href="#__codelineno-3-20"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">containerPort</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">80</span>
</code></pre></div>
<p>Deployment manifest can be saved in <code>echoserver-deployment.yaml</code> file.</p>
<p>Next, we will apply the deployment:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>kubectl<span class="w"> </span>apply<span class="w"> </span>-f<span class="w"> </span>echoserver-deployment.yaml
</code></pre></div>
<h3 id="step-2-create-a-service">Step 2: Create a Service<a class="headerlink" href="#step-2-create-a-service" title="Permanent link">&para;</a></h3>
<p>In this step, we will create a <code>Service</code> manifest to expose the <code>echoserver</code> application within the cluster. The service will also include an annotation for ExternalDNS to create a DNS record for the specified hostname.</p>
<p>Save the following content in a file named <code>echoserver-service.yaml</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></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-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></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-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><span class="nt">metadata</span><span class="p">:</span>
<a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></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">echoserver</span>
<a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a><span class="w"> </span><span class="nt">annotations</span><span class="p">:</span>
<a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></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">app.example.com</span>
<a id="__codelineno-5-7" name="__codelineno-5-7" href="#__codelineno-5-7"></a><span class="nt">spec</span><span class="p">:</span>
<a id="__codelineno-5-8" name="__codelineno-5-8" href="#__codelineno-5-8"></a><span class="w"> </span><span class="nt">ports</span><span class="p">:</span>
<a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">port</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">80</span>
<a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codelineno-5-10"></a><span class="w"> </span><span class="nt">targetPort</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">80</span>
<a id="__codelineno-5-11" name="__codelineno-5-11" href="#__codelineno-5-11"></a><span class="w"> </span><span class="nt">selector</span><span class="p">:</span>
<a id="__codelineno-5-12" name="__codelineno-5-12" href="#__codelineno-5-12"></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">echoserver</span>
</code></pre></div>
<p><strong>Note:</strong> Replace <code>app.example.com</code> with a subdomain of your DNS zone configured in IONOS Cloud DNS. For example, if your DNS zone is <code>example.com</code>, you can use a subdomain like <code>app.example.com</code>.</p>
<p>Next, apply the service:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a>kubectl<span class="w"> </span>apply<span class="w"> </span>-f<span class="w"> </span>echoserver-service.yaml
</code></pre></div>
<p>This service will expose the echoserver application on port 80 and instruct ExternalDNS to create a DNS record for <code>app.example.com</code>.</p>
<h3 id="step-3-create-an-ingress">Step 3: Create an Ingress<a class="headerlink" href="#step-3-create-an-ingress" title="Permanent link">&para;</a></h3>
<p>In this step, we will create an <code>Ingress</code> resource to expose the <code>echoserver</code> application externally. The ingress will route HTTP traffic to the <code>echoserver</code> service and include a hostname that ExternalDNS will use to create the corresponding DNS record.</p>
<p>Save the following content in a file named <code>echoserver-ingress.yaml</code> :</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">networking.k8s.io/v1</span>
<a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Ingress</span>
<a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a><span class="nt">metadata</span><span class="p">:</span>
<a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></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">echoserver</span>
<a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a><span class="nt">spec</span><span class="p">:</span>
<a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a><span class="w"> </span><span class="nt">rules</span><span class="p">:</span>
<a id="__codelineno-7-7" name="__codelineno-7-7" href="#__codelineno-7-7"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">host</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">app.example.com</span>
<a id="__codelineno-7-8" name="__codelineno-7-8" href="#__codelineno-7-8"></a><span class="w"> </span><span class="nt">http</span><span class="p">:</span>
<a id="__codelineno-7-9" name="__codelineno-7-9" href="#__codelineno-7-9"></a><span class="w"> </span><span class="nt">paths</span><span class="p">:</span>
<a id="__codelineno-7-10" name="__codelineno-7-10" href="#__codelineno-7-10"></a><span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">path</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/</span>
<a id="__codelineno-7-11" name="__codelineno-7-11" href="#__codelineno-7-11"></a><span class="w"> </span><span class="nt">pathType</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Prefix</span>
<a id="__codelineno-7-12" name="__codelineno-7-12" href="#__codelineno-7-12"></a><span class="w"> </span><span class="nt">backend</span><span class="p">:</span>
<a id="__codelineno-7-13" name="__codelineno-7-13" href="#__codelineno-7-13"></a><span class="w"> </span><span class="nt">service</span><span class="p">:</span>
<a id="__codelineno-7-14" name="__codelineno-7-14" href="#__codelineno-7-14"></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">echoserver</span>
<a id="__codelineno-7-15" name="__codelineno-7-15" href="#__codelineno-7-15"></a><span class="w"> </span><span class="nt">port</span><span class="p">:</span>
<a id="__codelineno-7-16" name="__codelineno-7-16" href="#__codelineno-7-16"></a><span class="w"> </span><span class="nt">number</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">80</span>
</code></pre></div>
<p><strong>Note:</strong> Replace <code>app.example.com</code> with a subdomain of your DNS zone configured in IONOS Cloud DNS. For example, if your DNS zone is <code>example.com</code>, you can use a subdomain like <code>app.example.com</code>.</p>
<p>Next, apply the ingress manifest:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a>kubectl<span class="w"> </span>apply<span class="w"> </span>-f<span class="w"> </span>echoserver-ingress.yaml
</code></pre></div>
<p>This ingress will expose the <code>echoserver</code> application at <code>http://app.example.com</code> and instruct ExternalDNS to create a DNS record for the specified hostname.</p>
<h2 id="accessing-the-application">Accessing the Application<a class="headerlink" href="#accessing-the-application" title="Permanent link">&para;</a></h2>
<p>Once the <code>Ingress</code> resource has been applied and the DNS records have been created, you can access the application using the hostname specified in the ingress (<code>app.example.com</code>).</p>
<h3 id="verify-application-access">Verify Application Access<a class="headerlink" href="#verify-application-access" title="Permanent link">&para;</a></h3>
<p>Use the following <code>curl</code> command to verify that the application is accessible:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-9-1" name="__codelineno-9-1" href="#__codelineno-9-1"></a>curl<span class="w"> </span>-I<span class="w"> </span>http://app.example.com
</code></pre></div>
<p>Replace app.example.com with the subdomain you configured in your DNS zone.</p>
<p><strong>Note:</strong> Ensure that your DNS changes have propagated and that the hostname resolves to the correct IP address before running the command.</p>
<h3 id="expected-result">Expected result<a class="headerlink" href="#expected-result" title="Permanent link">&para;</a></h3>
<p>You should see an HTTP response header indicating that the application is running, such as:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-10-1" name="__codelineno-10-1" href="#__codelineno-10-1"></a>HTTP/1.1<span class="w"> </span><span class="m">200</span><span class="w"> </span>OK
</code></pre></div>
<blockquote>
<p><strong>Troubleshooting:</strong></p>
<p>If you encounter any issues, verify the following:</p>
<ul>
<li>The DNS record for <code>app.example.com</code> (replace with your own subdomain configured in IONOS Cloud DNS) has been created in IONOS Cloud DNS.</li>
<li>The ingress controller is running and properly configured in your Kubernetes cluster.</li>
<li>The <code>echoserver</code> application is running and accessible within the cluster.</li>
</ul>
</blockquote>
<h2 id="verifying-ionos-cloud-dns-records">Verifying IONOS Cloud DNS Records<a class="headerlink" href="#verifying-ionos-cloud-dns-records" title="Permanent link">&para;</a></h2>
<p>Use the IONOS Cloud Console or API to verify that the A and TXT records for your domain have been created. For example, you can use the following API call:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-11-1" name="__codelineno-11-1" href="#__codelineno-11-1"></a>curl<span class="w"> </span>--location<span class="w"> </span>--request<span class="w"> </span>GET<span class="w"> </span><span class="s1">&#39;https://dns.de-fra.ionos.com/records?filter.name=app&#39;</span><span class="w"> </span><span class="se">\</span>
<a id="__codelineno-11-2" name="__codelineno-11-2" href="#__codelineno-11-2"></a>--header<span class="w"> </span><span class="s1">&#39;Authorization: Bearer &lt;IONOS_API_TOKEN&gt;&#39;</span>
</code></pre></div>
<p>Replace <code>&lt;IONOS_API_TOKEN&gt;</code> with your actual API token.</p>
<p>The API response should include the <code>A</code> and <code>TXT</code> records for the subdomain you configured.</p>
<blockquote>
<p><strong>Note:</strong> DNS changes may take a few minutes to propagate. If the records are not visible immediately, wait and try again.</p>
</blockquote>
<h2 id="cleanup">Cleanup<a class="headerlink" href="#cleanup" title="Permanent link">&para;</a></h2>
<blockquote>
<p><strong>Optional:</strong> Perform the cleanup step only if you no longer need the deployed resources.</p>
</blockquote>
<p>Once you have verified the setup, you can clean up the resources created during this tutorial:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a>kubectl<span class="w"> </span>delete<span class="w"> </span>-f<span class="w"> </span>echoserver-deployment.yaml
<a id="__codelineno-12-2" name="__codelineno-12-2" href="#__codelineno-12-2"></a>kubectl<span class="w"> </span>delete<span class="w"> </span>-f<span class="w"> </span>echoserver-service.yaml
<a id="__codelineno-12-3" name="__codelineno-12-3" href="#__codelineno-12-3"></a>kubectl<span class="w"> </span>delete<span class="w"> </span>-f<span class="w"> </span>echoserver-ingress.yaml
</code></pre></div>
<h2 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link">&para;</a></h2>
<p>In this tutorial, you successfully deployed ExternalDNS webhook with IONOS Cloud DNS as the provider.<br />
You created a Kubernetes deployment, service, and ingress, and verified that DNS records were created and the application was accessible.<br />
You also learned how to clean up the resources when they are no longer needed.</p>
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