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<a href="#requirements" class="md-nav__link">
Requirements
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Terraform Setup
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Provider
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Flatcar Linux Images
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Cluster
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ssh-agent
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Apply
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Verify
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Going Further
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Variables
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Required
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DNS Zone
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SSH Fingerprints
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Optional
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<h1 id="digitalocean">DigitalOcean<a class="headerlink" href="#digitalocean" title="Permanent link">&para;</a></h1>
<p>In this tutorial, we'll create a Kubernetes v1.24.3 cluster on DigitalOcean with Flatcar Linux.</p>
<p>We'll declare a Kubernetes cluster using the Typhoon Terraform module. Then apply the changes to create controller droplets, worker droplets, DNS records, tags, and TLS assets.</p>
<p>Controller hosts are provisioned to run an <code>etcd-member</code> peer and a <code>kubelet</code> service. Worker hosts run a <code>kubelet</code> service. Controller nodes run <code>kube-apiserver</code>, <code>kube-scheduler</code>, <code>kube-controller-manager</code>, and <code>coredns</code>, while <code>kube-proxy</code> and <code>calico</code> (or <code>flannel</code>) run on every node. A generated <code>kubeconfig</code> provides <code>kubectl</code> access to the cluster.</p>
<h2 id="requirements">Requirements<a class="headerlink" href="#requirements" title="Permanent link">&para;</a></h2>
<ul>
<li>Digital Ocean Account and Token</li>
<li>Digital Ocean Domain (registered Domain Name or delegated subdomain)</li>
<li>Terraform v0.13.0+</li>
</ul>
<h2 id="terraform-setup">Terraform Setup<a class="headerlink" href="#terraform-setup" title="Permanent link">&para;</a></h2>
<p>Install <a href="https://www.terraform.io/downloads.html">Terraform</a> v0.13.0+ on your system.</p>
<div class="highlight"><pre><span></span><code>$ terraform version
Terraform v1.0.0
</code></pre></div>
<p>Read <a href="/architecture/concepts/">concepts</a> to learn about Terraform, modules, and organizing resources. Change to your infrastructure repository (e.g. <code>infra</code>).</p>
<div class="highlight"><pre><span></span><code>cd infra/clusters
</code></pre></div>
<h2 id="provider">Provider<a class="headerlink" href="#provider" title="Permanent link">&para;</a></h2>
<p>Login to <a href="https://cloud.digitalocean.com">DigitalOcean</a>. Or if you don't have one, create an account with our <a href="https://m.do.co/c/94a5a4e76387">referral link</a> to get free credits.</p>
<p>Generate a Personal Access Token with read/write scope from the <a href="https://cloud.digitalocean.com/settings/api/tokens">API tab</a>. Write the token to a file that can be referenced in configs.</p>
<div class="highlight"><pre><span></span><code>mkdir -p ~/.config/digital-ocean
<span class="nb">echo</span> <span class="s2">&quot;TOKEN&quot;</span> &gt; ~/.config/digital-ocean/token
</code></pre></div>
<p>Configure the DigitalOcean provider to use your token in a <code>providers.tf</code> file.</p>
<div class="highlight"><pre><span></span><code><span class="kr">provider</span><span class="w"> </span><span class="nv">&quot;digitalocean&quot;</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="na">token</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;${chomp(file(&quot;~/.config/digital-ocean/token&quot;))}&quot;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
<span class="kr">provider</span><span class="w"> </span><span class="nv">&quot;ct&quot;</span><span class="w"> </span><span class="p">{}</span><span class="w"></span>
<span class="nb">terraform</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nb">required_providers</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="nb">ct</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="na">source</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;poseidon/ct&quot;</span><span class="w"></span>
<span class="w"> </span><span class="na">version</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;0.10.0&quot;</span><span class="w"></span>
<span class="w"> </span><span class="p">}</span><span class="w"></span>
<span class="w"> </span><span class="nb">digitalocean</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="na">source</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;digitalocean/digitalocean&quot;</span><span class="w"></span>
<span class="w"> </span><span class="na">version</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;2.21.0&quot;</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-images">Flatcar Linux Images<a class="headerlink" href="#flatcar-linux-images" title="Permanent link">&para;</a></h3>
<p>Flatcar Linux publishes DigitalOcean images, but does not yet upload them. DigitalOcean allows <a href="https://blog.digitalocean.com/custom-images/">custom images</a> to be uploaded via URLor file.</p>
<p><a href="https://www.flatcar-linux.org/releases/">Download</a> the Flatcar Linux DigitalOcean bin image. Rename the image with the channel and version (to refer to these images over time) and <a href="https://cloud.digitalocean.com/images/custom_images">upload</a> it as a custom image.</p>
<div class="highlight"><pre><span></span><code><span class="kr">data</span><span class="w"> </span><span class="nc">&quot;digitalocean_image&quot;</span><span class="w"> </span><span class="nv">&quot;flatcar-stable-2303-4-0&quot;</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="na">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;flatcar-stable-2303.4.0.bin.bz2&quot;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
<p>Set the <a href="#variables">os_image</a> in the next step.</p>
<h2 id="cluster">Cluster<a class="headerlink" href="#cluster" title="Permanent link">&para;</a></h2>
<p>Define a Kubernetes cluster using the module <code>digital-ocean/flatcar-linux/kubernetes</code>.</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="na">source</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;git::https://github.com/poseidon/typhoon//digital-ocean/flatcar-linux/kubernetes?ref=v1.24.3&quot;</span><span class="c1"></span>
<span class="c1"> # Digital Ocean</span>
<span class="w"> </span><span class="na">cluster_name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;nemo&quot;</span><span class="w"></span>
<span class="w"> </span><span class="na">region</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;nyc3&quot;</span><span class="w"></span>
<span class="w"> </span><span class="na">dns_zone</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;digital-ocean.example.com&quot;</span><span class="c1"></span>
<span class="c1"> # configuration</span>
<span class="w"> </span><span class="na">os_image</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nv">data.digitalocean_image.flatcar-stable-2303-4-0.id</span><span class="w"></span>
<span class="w"> </span><span class="na">ssh_fingerprints</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">[</span><span class="s2">&quot;d7:9d:79:ae:56:32:73:79:95:88:e3:a2:ab:5d:45:e7&quot;</span><span class="p">]</span><span class="c1"></span>
<span class="c1"> # optional</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="p">}</span><span class="w"></span>
</code></pre></div>
<p>Reference the <a href="#variables">variables docs</a> or the <a href="https://github.com/poseidon/typhoon/blob/master/digital-ocean/flatcar-linux/kubernetes/variables.tf">variables.tf</a> source.</p>
<h2 id="ssh-agent">ssh-agent<a class="headerlink" href="#ssh-agent" title="Permanent link">&para;</a></h2>
<p>Initial bootstrapping requires <code>bootstrap.service</code> be started on one controller node. Terraform uses <code>ssh-agent</code> to automate this step. Add your SSH private key to <code>ssh-agent</code>.</p>
<div class="highlight"><pre><span></span><code>ssh-add ~/.ssh/id_rsa
ssh-add -L
</code></pre></div>
<h2 id="apply">Apply<a class="headerlink" href="#apply" title="Permanent link">&para;</a></h2>
<p>Initialize the config directory if this is the first use with Terraform.</p>
<div class="highlight"><pre><span></span><code>terraform init
</code></pre></div>
<p>Plan the resources to be created.</p>
<div class="highlight"><pre><span></span><code>$ terraform plan
Plan: <span class="m">54</span> to add, <span class="m">0</span> to change, <span class="m">0</span> to destroy.
</code></pre></div>
<p>Apply the changes to create the cluster.</p>
<div class="highlight"><pre><span></span><code>$ terraform apply
module.nemo.null_resource.bootstrap: Still creating... <span class="o">(</span>30s elapsed<span class="o">)</span>
module.nemo.null_resource.bootstrap: Provisioning with <span class="s1">&#39;remote-exec&#39;</span>...
...
module.nemo.null_resource.bootstrap: Still creating... <span class="o">(</span>6m20s elapsed<span class="o">)</span>
module.nemo.null_resource.bootstrap: Creation <span class="nb">complete</span> <span class="o">(</span>ID: <span class="m">7599298447329218468</span><span class="o">)</span>
Apply complete! Resources: <span class="m">42</span> added, <span class="m">0</span> changed, <span class="m">0</span> destroyed.
</code></pre></div>
<p>In 3-6 minutes, the Kubernetes cluster will be ready.</p>
<h2 id="verify">Verify<a class="headerlink" href="#verify" title="Permanent link">&para;</a></h2>
<p><a href="https://kubernetes.io/docs/tasks/tools/install-kubectl/">Install kubectl</a> on your system. Obtain the generated cluster <code>kubeconfig</code> from module outputs (e.g. write to a local file).</p>
<div class="highlight"><pre><span></span><code>resource &quot;local_file&quot; &quot;kubeconfig-nemo&quot; {
content = module.nemo.kubeconfig-admin
filename = &quot;/home/user/.kube/configs/nemo-config&quot;
}
</code></pre></div>
<p>List nodes in the cluster.</p>
<div class="highlight"><pre><span></span><code>$ export KUBECONFIG=/home/user/.kube/configs/nemo-config
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
10.132.110.130 Ready &lt;none&gt; 10m v1.24.3
10.132.115.81 Ready &lt;none&gt; 10m v1.24.3
10.132.124.107 Ready &lt;none&gt; 10m v1.24.3
</code></pre></div>
<p>List the pods.</p>
<div class="highlight"><pre><span></span><code>NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-1187388186-ld1j7 1/1 Running 0 11m
kube-system coredns-1187388186-rdhf7 1/1 Running 0 11m
kube-system calico-node-1m5bf 2/2 Running 0 11m
kube-system calico-node-7jmr1 2/2 Running 0 11m
kube-system calico-node-bknc8 2/2 Running 0 11m
kube-system kube-apiserver-ip-10.132.115.81 1/1 Running 0 11m
kube-system kube-controller-manager-ip-10.132.115.81 1/1 Running 0 11m
kube-system kube-proxy-6kxjf 1/1 Running 0 11m
kube-system kube-proxy-fh3td 1/1 Running 0 11m
kube-system kube-proxy-k35rc 1/1 Running 0 11m
kube-system kube-scheduler-ip-10.132.115.81 1/1 Running 0 11m
</code></pre></div>
<h2 id="going-further">Going Further<a class="headerlink" href="#going-further" title="Permanent link">&para;</a></h2>
<p>Learn about <a href="/topics/maintenance/">maintenance</a> and <a href="/addons/overview/">addons</a>.</p>
<h2 id="variables">Variables<a class="headerlink" href="#variables" title="Permanent link">&para;</a></h2>
<p>Check the <a href="https://github.com/poseidon/typhoon/blob/master/digital-ocean/flatcar-linux/kubernetes/variables.tf">variables.tf</a> source.</p>
<h3 id="required">Required<a class="headerlink" href="#required" title="Permanent link">&para;</a></h3>
<table>
<thead>
<tr>
<th align="left">Name</th>
<th align="left">Description</th>
<th align="left">Example</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">cluster_name</td>
<td align="left">Unique cluster name (prepended to dns_zone)</td>
<td align="left">"nemo"</td>
</tr>
<tr>
<td align="left">region</td>
<td align="left">Digital Ocean region</td>
<td align="left">"nyc1", "sfo2", "fra1", tor1"</td>
</tr>
<tr>
<td align="left">dns_zone</td>
<td align="left">Digital Ocean domain (i.e. DNS zone)</td>
<td align="left">"do.example.com"</td>
</tr>
<tr>
<td align="left">os_image</td>
<td align="left">Container Linux image for instances</td>
<td align="left">"uploaded-flatcar-image-id"</td>
</tr>
<tr>
<td align="left">ssh_fingerprints</td>
<td align="left">SSH public key fingerprints</td>
<td align="left">["d7:9d..."]</td>
</tr>
</tbody>
</table>
<h4 id="dns-zone">DNS Zone<a class="headerlink" href="#dns-zone" title="Permanent link">&para;</a></h4>
<p>Clusters create DNS A records <code>${cluster_name}.${dns_zone}</code> to resolve to controller droplets (round robin). This FQDN is used by workers and <code>kubectl</code> to access the apiserver(s). In this example, the cluster's apiserver would be accessible at <code>nemo.do.example.com</code>.</p>
<p>You'll need a registered domain name or delegated subdomain in DigitalOcean Domains (i.e. DNS zones). You can set this up once and create many clusters with unique names.</p>
<div class="highlight"><pre><span></span><code><span class="c1"># Declare a DigitalOcean record to also create a zone file</span>
<span class="kr">resource</span><span class="w"> </span><span class="nc">&quot;digitalocean_domain&quot;</span><span class="w"> </span><span class="nv">&quot;zone-for-clusters&quot;</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w"> </span><span class="na">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;do.example.com&quot;</span><span class="w"></span>
<span class="w"> </span><span class="na">ip_address</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;8.8.8.8&quot;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
<div class="admonition tip">
<p>If you have an existing domain name with a zone file elsewhere, just delegate a subdomain that can be managed on DigitalOcean (e.g. do.mydomain.com) and <a href="https://www.digitalocean.com/community/tutorials/how-to-set-up-a-host-name-with-digitalocean">update nameservers</a>.</p>
</div>
<h4 id="ssh-fingerprints">SSH Fingerprints<a class="headerlink" href="#ssh-fingerprints" title="Permanent link">&para;</a></h4>
<p>DigitalOcean droplets are created with your SSH public key "fingerprint" (i.e. MD5 hash) to allow access. If your SSH public key is at <code>~/.ssh/id_rsa</code>, find the fingerprint with,</p>
<div class="highlight"><pre><span></span><code>ssh-keygen -E md5 -lf ~/.ssh/id_rsa.pub <span class="p">|</span> awk <span class="s1">&#39;{print $2}&#39;</span>
MD5:d7:9d:79:ae:56:32:73:79:95:88:e3:a2:ab:5d:45:e7
</code></pre></div>
<p>If you use <code>ssh-agent</code> (e.g. Yubikey for SSH), find the fingerprint with,</p>
<div class="highlight"><pre><span></span><code>ssh-add -l -E md5
2048 MD5:d7:9d:79:ae:56:32:73:79:95:88:e3:a2:ab:5d:45:e7 cardno:000603633110 (RSA)
</code></pre></div>
<p>Digital Ocean requires the SSH public key be uploaded to your account, so you may also find the fingerprint under Settings -&gt; Security. Finally, if you don't have an SSH key, <a href="https://help.github.com/articles/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent/">create one now</a>.</p>
<h3 id="optional">Optional<a class="headerlink" href="#optional" title="Permanent link">&para;</a></h3>
<table>
<thead>
<tr>
<th align="left">Name</th>
<th align="left">Description</th>
<th align="left">Default</th>
<th align="left">Example</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">controller_count</td>
<td align="left">Number of controllers (i.e. masters)</td>
<td align="left">1</td>
<td align="left">1</td>
</tr>
<tr>
<td align="left">worker_count</td>
<td align="left">Number of workers</td>
<td align="left">1</td>
<td align="left">3</td>
</tr>
<tr>
<td align="left">controller_type</td>
<td align="left">Droplet type for controllers</td>
<td align="left">"s-2vcpu-2gb"</td>
<td align="left">s-2vcpu-2gb, s-2vcpu-4gb, s-4vcpu-8gb, ...</td>
</tr>
<tr>
<td align="left">worker_type</td>
<td align="left">Droplet type for workers</td>
<td align="left">"s-1vcpu-2gb"</td>
<td align="left">s-1vcpu-2gb, s-2vcpu-2gb, ...</td>
</tr>
<tr>
<td align="left">controller_snippets</td>
<td align="left">Controller Container Linux Config snippets</td>
<td align="left">[]</td>
<td align="left"><a href="/advanced/customization/">example</a></td>
</tr>
<tr>
<td align="left">worker_snippets</td>
<td align="left">Worker Container Linux Config snippets</td>
<td align="left">[]</td>
<td align="left"><a href="/advanced/customization/">example</a></td>
</tr>
<tr>
<td align="left">networking</td>
<td align="left">Choice of networking provider</td>
<td align="left">"cilium"</td>
<td align="left">"calico" or "cilium" or "flannel"</td>
</tr>
<tr>
<td align="left">pod_cidr</td>
<td align="left">CIDR IPv4 range to assign to Kubernetes pods</td>
<td align="left">"10.2.0.0/16"</td>
<td align="left">"10.22.0.0/16"</td>
</tr>
<tr>
<td align="left">service_cidr</td>
<td align="left">CIDR IPv4 range to assign to Kubernetes services</td>
<td align="left">"10.3.0.0/16"</td>
<td align="left">"10.3.0.0/24"</td>
</tr>
</tbody>
</table>
<p>Check the list of valid <a href="https://developers.digitalocean.com/documentation/changelog/api-v2/new-size-slugs-for-droplet-plan-changes/">droplet types</a> or use <code>doctl compute size list</code>.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Do not choose a <code>controller_type</code> smaller than 2GB. Smaller droplets are not sufficient for running a controller and bootstrapping will fail.</p>
</div>
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