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<h1 id="customization">Customization<a class="headerlink" href="#customization" title="Permanent link">&para;</a></h1>
<p>Typhoon provides Kubernetes clusters with defaults recommended for production. Terraform variables expose supported customization options. Advanced options are available for customizing the architecture or hosts as well.</p>
<h2 id="variables">Variables<a class="headerlink" href="#variables" title="Permanent link">&para;</a></h2>
<p>Typhoon modules accept Terraform input variables for customizing clusters in meritorious ways (e.g. <code>worker_count</code>, etc). Variables are carefully considered to provide essentials, while limiting complexity and test matrix burden. See each platform's tutorial for options.</p>
<h2 id="addons">Addons<a class="headerlink" href="#addons" title="Permanent link">&para;</a></h2>
<p>Clusters are kept to a minimal Kubernetes control plane by offering components like Nginx Ingress Controller, Prometheus, and Grafana as optional post-install <a href="https://github.com/poseidon/typhoon/tree/master/addons">addons</a>. Customize addons by modifying a copy of our addon manifests.</p>
<h2 id="hosts">Hosts<a class="headerlink" href="#hosts" title="Permanent link">&para;</a></h2>
<p>Typhoon uses the <a href="https://github.com/coreos/ignition">Ignition</a> system of Fedora CoreOS and Flatcar Linux to immutably declare a system via first-boot disk provisioning. Fedora CoreOS uses a <a href="https://coreos.github.io/butane/specs/">Butane Config</a> and Flatcar Linux uses a <a href="https://github.com/coreos/container-linux-config-transpiler/blob/master/doc/examples.md">Container Linux Config</a> (CLC). These define disk partitions, filesystems, systemd units, dropins, config files, mount units, raid arrays, and users.</p>
<p>Controller and worker instances form a minimal and secure Kubernetes cluster on each platform. Typhoon provides the <strong>snippets</strong> feature to accept Butane or Container Linux Configs to validate and additively merge into instance declarations. This allows advanced host customization and experimentation.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Snippets cannot be used to modify an already existing instance, the antithesis of immutable provisioning. Ignition fully declares a system on first boot only.</p>
</div>
<div class="admonition danger">
<p class="admonition-title">Danger</p>
<p>Snippets provide the powerful host customization abilities of Ignition. You are responsible for additional units, configs, files, and conflicts.</p>
</div>
<div class="admonition danger">
<p class="admonition-title">Danger</p>
<p>Edits to snippets for controller instances can (correctly) cause Terraform to observe a diff (if not otherwise suppressed) and propose destroying and recreating controller(s). Recognize that this is destructive since controllers run etcd and are stateful. See <a href="/topics/maintenance/#upgrades">blue/green</a> clusters.</p>
</div>
<h3 id="fedora-coreos">Fedora CoreOS<a class="headerlink" href="#fedora-coreos" title="Permanent link">&para;</a></h3>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Fedora CoreOS snippets require <code>terraform-provider-ct</code> v0.5+</p>
</div>
<p>Define a Butane Config (<a href="https://coreos.github.io/butane/specs/">docs</a>, <a href="https://github.com/coreos/butane/blob/main/docs/config-fcos-v1_4.md">config</a>) in version control near your Terraform workspace directory (e.g. perhaps in a <code>snippets</code> subdirectory). You may organize snippets into multiple files, if desired.</p>
<p>For example, ensure an <code>/opt/hello</code> file is created with permissions 0644.</p>
<div class="highlight"><pre><span></span><code><span class="c1"># custom-files</span><span class="w"></span>
<span class="nt">variant</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">fcos</span><span class="w"></span>
<span class="nt">version</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1.4.0</span><span class="w"></span>
<span class="nt">storage</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">files</span><span class="p">:</span><span class="w"></span>
<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">/opt/hello</span><span class="w"></span>
<span class="w"> </span><span class="nt">contents</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">inline</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span><span class="w"></span>
<span class="w"> </span><span class="no">Hello World</span><span class="w"></span>
<span class="w"> </span><span class="nt">mode</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0644</span><span class="w"></span>
</code></pre></div>
<p>Reference the FCC contents by location (e.g. <code>file("./custom-units.yaml")</code>). On <a href="/fedora-coreos/aws/#cluster">AWS</a> or <a href="/fedora-coreos/google-cloud/#cluster">Google Cloud</a> extend the <code>controller_snippets</code> or <code>worker_snippets</code> list variables.</p>
<div class="highlight"><pre><span></span><code><span class="kr">module</span><span class="w"> </span><span class="nv">&quot;nemo&quot;</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="w"> </span><span class="na">controller_count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">1</span><span class="w"></span>
<span class="w"> </span><span class="na">worker_count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">2</span><span class="w"></span>
<span class="w"> </span><span class="na">controller_snippets</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./custom-files&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./custom-units&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="na">worker_snippets</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./custom-files&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./custom-units&quot;)&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
<p>On <a href="/fedora-coreos/bare-metal/#cluster">Bare-Metal</a>, different FCCs may be used for each node (since hardware may be heterogeneous). Extend the <code>snippets</code> map variable by mapping a controller or worker name key to a list of snippets.</p>
<div class="highlight"><pre><span></span><code><span class="kr">module</span><span class="w"> </span><span class="nv">&quot;mercury&quot;</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="w"> </span><span class="nb">snippets</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;node2&quot;</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./units/hello.yaml&quot;</span><span class="p">)]</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;node3&quot;</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./units/world.yaml&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./units/hello.yaml&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
<h3 id="flatcar-linux">Flatcar Linux<a class="headerlink" href="#flatcar-linux" title="Permanent link">&para;</a></h3>
<p>Define a Container Linux Config (CLC) (<a href="https://github.com/coreos/container-linux-config-transpiler/blob/master/doc/configuration.md">config</a>, <a href="https://github.com/coreos/container-linux-config-transpiler/blob/master/doc/examples.md">examples</a>) in version control near your Terraform workspace directory (e.g. perhaps in a <code>snippets</code> subdirectory). You may organize snippets into multiple files, if desired.</p>
<p>For example, ensure an <code>/opt/hello</code> file is created with permissions 0644.</p>
<div class="highlight"><pre><span></span><code><span class="c1"># custom-files</span><span class="w"></span>
<span class="nt">storage</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">files</span><span class="p">:</span><span class="w"></span>
<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">/opt/hello</span><span class="w"></span>
<span class="w"> </span><span class="nt">filesystem</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">root</span><span class="w"></span>
<span class="w"> </span><span class="nt">contents</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">inline</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span><span class="w"></span>
<span class="w"> </span><span class="no">Hello World</span><span class="w"></span>
<span class="w"> </span><span class="nt">mode</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0644</span><span class="w"></span>
</code></pre></div>
<p>Or ensure a systemd unit <code>hello.service</code> is created and a dropin <code>50-etcd-cluster.conf</code> is added for <code>etcd-member.service</code>.</p>
<div class="highlight"><pre><span></span><code><span class="c1"># custom-units</span><span class="w"></span>
<span class="nt">systemd</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">units</span><span class="p">:</span><span class="w"></span>
<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">hello.service</span><span class="w"></span>
<span class="w"> </span><span class="nt">enable</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="w"> </span><span class="nt">contents</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span><span class="w"></span>
<span class="w"> </span><span class="no">[Unit]</span><span class="w"></span>
<span class="w"> </span><span class="no">Description=Hello World</span><span class="w"></span>
<span class="w"> </span><span class="no">[Service]</span><span class="w"></span>
<span class="w"> </span><span class="no">Type=oneshot</span><span class="w"></span>
<span class="w"> </span><span class="no">ExecStart=/usr/bin/echo Hello World!</span><span class="w"></span>
<span class="w"> </span><span class="no">[Install]</span><span class="w"></span>
<span class="w"> </span><span class="no">WantedBy=multi-user.target</span><span class="w"></span>
<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">etcd-member.service</span><span class="w"></span>
<span class="w"> </span><span class="nt">enable</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="w"> </span><span class="nt">dropins</span><span class="p">:</span><span class="w"></span>
<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">50-etcd-cluster.conf</span><span class="w"></span>
<span class="w"> </span><span class="nt">contents</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span><span class="w"></span>
<span class="w"> </span><span class="no">Environment=&quot;ETCD_LOG_PACKAGE_LEVELS=etcdserver=WARNING,security=DEBUG&quot;</span><span class="w"></span>
</code></pre></div>
<p>Reference the CLC contents by location (e.g. <code>file("./custom-units.yaml")</code>). On <a href="/flatcar-linux/aws/#cluster">AWS</a>, <a href="/flatcar-linux/azure/#cluster">Azure</a>, <a href="/flatcar-linux/digital-ocean/#cluster">DigitalOcean</a>, or <a href="/flatcar-linux/google-cloud/#cluster">Google Cloud</a> extend the <code>controller_snippets</code> or <code>worker_snippets</code> list variables.</p>
<div class="highlight"><pre><span></span><code><span class="kr">module</span><span class="w"> </span><span class="nv">&quot;nemo&quot;</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="w"> </span><span class="na">controller_count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">1</span><span class="w"></span>
<span class="w"> </span><span class="na">worker_count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="m">2</span><span class="w"></span>
<span class="w"> </span><span class="na">controller_snippets</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./custom-files&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./custom-units&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="na">worker_snippets</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./custom-files&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./custom-units&quot;)&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
<p>On <a href="/flatcar-linux/bare-metal/#cluster">Bare-Metal</a>, different CLCs may be used for each node (since hardware may be heterogeneous). Extend the <code>snippets</code> map variable by mapping a controller or worker name key to a list of snippets.</p>
<div class="highlight"><pre><span></span><code><span class="kr">module</span><span class="w"> </span><span class="nv">&quot;mercury&quot;</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="w"> </span><span class="nb">snippets</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;node2&quot;</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./units/hello.yaml&quot;</span><span class="p">)]</span><span class="w"></span>
<span class="w"> </span><span class="s2">&quot;node3&quot;</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./units/world.yaml&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./units/hello.yaml&quot;</span><span class="p">),</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
<h2 id="architecture">Architecture<a class="headerlink" href="#architecture" title="Permanent link">&para;</a></h2>
<p>Typhoon chooses variables to expose with purpose. If you must customize clusters in ways that aren't supported by input variables, fork Typhoon and maintain a repository with customizations. Reference the repository by changing the username.</p>
<div class="highlight"><pre><span></span><code>module &quot;nemo&quot; {
source = &quot;git::https://github.com/USERNAME/typhoon//digital-ocean/flatcar-linux/kubernetes?ref=myspecialcase&quot;
...
}
</code></pre></div>
<p>To customize low-level Kubernetes control plane bootstrapping, see the <a href="https://github.com/poseidon/terraform-render-bootstrap">poseidon/terraform-render-bootstrap</a> Terraform module.</p>
<h2 id="system-images">System Images<a class="headerlink" href="#system-images" title="Permanent link">&para;</a></h2>
<p>Typhoon publishes Kubelet <a href="/topics/security/#container-images">container images</a> to Quay.io (default) and to Dockerhub (in case of a Quay <a href="https://github.com/poseidon/typhoon/issues/735">outage</a> or breach). Quay automated builds also provide the option for fully verifiable tagged images (<code>build-{short_sha}</code>).</p>
<p>To set an alternative etcd image or Kubelet image, use a snippet to set a systemd dropin.</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Kubelet</label><label for="__tabbed_1_2">etcd</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code><span class="c1"># kubelet-image-override.yaml</span><span class="w"></span>
<span class="nt">variant</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">fcos &lt;- remove for Flatcar Linux</span><span class="w"></span>
<span class="nt">version</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1.4.0 &lt;- remove for Flatcar Linux</span><span class="w"></span>
<span class="nt">systemd</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">units</span><span class="p">:</span><span class="w"></span>
<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">kubelet.service</span><span class="w"></span>
<span class="w"> </span><span class="nt">dropins</span><span class="p">:</span><span class="w"></span>
<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">10-image-override.conf</span><span class="w"></span>
<span class="w"> </span><span class="nt">contents</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span><span class="w"></span>
<span class="w"> </span><span class="no">[Service]</span><span class="w"></span>
<span class="w"> </span><span class="no">Environment=KUBELET_IMAGE=docker.io/psdn/kubelet:v1.18.3</span><span class="w"></span>
</code></pre></div>
</div>
<div class="tabbed-block">
<div class="highlight"><pre><span></span><code><span class="c1"># etcd-image-override.yaml</span><span class="w"></span>
<span class="nt">variant</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">fcos &lt;- remove for Flatcar Linux</span><span class="w"></span>
<span class="nt">version</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1.4.0 &lt;- remove for Flatcar Linux</span><span class="w"></span>
<span class="nt">systemd</span><span class="p">:</span><span class="w"></span>
<span class="w"> </span><span class="nt">units</span><span class="p">:</span><span class="w"></span>
<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">etcd-member.service</span><span class="w"></span>
<span class="w"> </span><span class="nt">dropins</span><span class="p">:</span><span class="w"></span>
<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">10-image-override.conf</span><span class="w"></span>
<span class="w"> </span><span class="nt">contents</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span><span class="w"></span>
<span class="w"> </span><span class="no">[Service]</span><span class="w"></span>
<span class="w"> </span><span class="no">Environment=ETCD_IMAGE=quay.io/mymirror/etcd:v3.4.12</span><span class="w"></span>
</code></pre></div>
</div>
</div>
</div>
<p>Then reference the snippet in the cluster or worker pool definition.</p>
<div class="highlight"><pre><span></span><code><span class="kr">module</span><span class="w"> </span><span class="nv">&quot;nemo&quot;</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="w"> </span><span class="na">worker_snippets</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="w"></span>
<span class="w"> </span><span class="nf">file</span><span class="p">(</span><span class="s2">&quot;./snippets/kubelet-image-override.yaml&quot;</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="p">]</span><span class="w"></span>
<span class="w"> </span><span class="p">...</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
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