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<h1 id="aws">AWS<a class="headerlink" href="#aws" title="Permanent link">&para;</a></h1>
<p>In this tutorial, we'll create a Kubernetes v1.24.3 cluster on AWS with Flatcar Linux.</p>
<p>We'll declare a Kubernetes cluster using the Typhoon Terraform module. Then apply the changes to create a VPC, gateway, subnets, security groups, controller instances, worker auto-scaling group, network load balancer, 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>AWS Account and IAM credentials</li>
<li>AWS Route53 DNS Zone (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 your AWS IAM dashboard and find your IAM user. Select "Security Credentials" and create an access key. Save the id and secret to a file that can be referenced in configs.</p>
<div class="highlight"><pre><span></span><code>[default]
aws_access_key_id = xxx
aws_secret_access_key = yyy
</code></pre></div>
<p>Configure the AWS provider to use your access key credentials 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;aws&quot;</span><span class="w"> </span><span class="p">{</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;eu-central-1&quot;</span><span class="w"></span>
<span class="w"> </span><span class="na">shared_credentials_file</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;/home/user/.config/aws/credentials&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">aws</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;hashicorp/aws&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;4.22.0&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>
<p>Additional configuration options are described in the <code>aws</code> provider <a href="https://www.terraform.io/docs/providers/aws/">docs</a>.</p>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>Regions are listed in <a href="http://docs.aws.amazon.com/general/latest/gr/rande.html#ec2_region">docs</a> or with <code>aws ec2 describe-regions</code>.</p>
</div>
<h2 id="cluster">Cluster<a class="headerlink" href="#cluster" title="Permanent link">&para;</a></h2>
<p>Define a Kubernetes cluster using the module <code>aws/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;tempest&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//aws/flatcar-linux/kubernetes?ref=v1.24.3&quot;</span><span class="c1"></span>
<span class="c1"> # AWS</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;tempest&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;aws.example.com&quot;</span><span class="w"></span>
<span class="w"> </span><span class="na">dns_zone_id</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;Z3PAABBCFAKEC0&quot;</span><span class="c1"></span>
<span class="c1"> # configuration</span>
<span class="w"> </span><span class="na">ssh_authorized_key</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;ssh-rsa AAAAB3Nz...&quot;</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="w"> </span><span class="na">worker_type</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">&quot;t3.small&quot;</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/aws/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">80</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.tempest.null_resource.bootstrap: Still creating... <span class="o">(</span>4m50s elapsed<span class="o">)</span>
module.tempest.null_resource.bootstrap: Still creating... <span class="o">(</span>5m0s elapsed<span class="o">)</span>
module.tempest.null_resource.bootstrap: Creation <span class="nb">complete</span> after 11m8s <span class="o">(</span>ID: <span class="m">3961816482286168143</span><span class="o">)</span>
Apply complete! Resources: <span class="m">98</span> added, <span class="m">0</span> changed, <span class="m">0</span> destroyed.
</code></pre></div>
<p>In 4-8 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-tempest&quot; {
content = module.tempest.kubeconfig-admin
filename = &quot;/home/user/.kube/configs/tempest-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/tempest-config
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
ip-10-0-3-155 Ready &lt;none&gt; 10m v1.24.3
ip-10-0-26-65 Ready &lt;none&gt; 10m v1.24.3
ip-10-0-41-21 Ready &lt;none&gt; 10m v1.24.3
</code></pre></div>
<p>List the pods.</p>
<div class="highlight"><pre><span></span><code>$ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-node-1m5bf 2/2 Running 0 34m
kube-system calico-node-7jmr1 2/2 Running 0 34m
kube-system calico-node-bknc8 2/2 Running 0 34m
kube-system coredns-1187388186-wx1lg 1/1 Running 0 34m
kube-system coredns-1187388186-qjnvp 1/1 Running 0 34m
kube-system kube-apiserver-ip-10-0-3-155 1/1 Running 0 34m
kube-system kube-controller-manager-ip-10-0-3-155 1/1 Running 0 34m
kube-system kube-proxy-14wxv 1/1 Running 0 34m
kube-system kube-proxy-9vxh2 1/1 Running 0 34m
kube-system kube-proxy-sbbsh 1/1 Running 0 34m
kube-system kube-scheduler-ip-10-0-3-155 1/1 Running 1 34m
</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/aws/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">"tempest"</td>
</tr>
<tr>
<td align="left">dns_zone</td>
<td align="left">AWS Route53 DNS zone</td>
<td align="left">"aws.example.com"</td>
</tr>
<tr>
<td align="left">dns_zone_id</td>
<td align="left">AWS Route53 DNS zone id</td>
<td align="left">"Z3PAABBCFAKEC0"</td>
</tr>
<tr>
<td align="left">ssh_authorized_key</td>
<td align="left">SSH public key for user 'core'</td>
<td align="left">"ssh-rsa AAAAB3NZ..."</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 a DNS A record <code>${cluster_name}.${dns_zone}</code> to resolve a network load balancer backed by controller instances. 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>tempest.aws.example.com</code>.</p>
<p>You'll need a registered domain name or delegated subdomain on AWS Route53. You can set this up once and create many clusters with unique names.</p>
<div class="highlight"><pre><span></span><code><span class="kr">resource</span><span class="w"> </span><span class="nc">&quot;aws_route53_zone&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;aws.example.com.&quot;</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
<p>Reference the DNS zone id with <code>aws_route53_zone.zone-for-clusters.zone_id</code>.</p>
<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 Route53 (e.g. aws.mydomain.com) and <a href="http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/SOA-NSrecords.html">update nameservers</a>.</p>
</div>
<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">EC2 instance type for controllers</td>
<td align="left">"t3.small"</td>
<td align="left">See below</td>
</tr>
<tr>
<td align="left">worker_type</td>
<td align="left">EC2 instance type for workers</td>
<td align="left">"t3.small"</td>
<td align="left">See below</td>
</tr>
<tr>
<td align="left">os_image</td>
<td align="left">AMI channel for a Container Linux derivative</td>
<td align="left">"flatcar-stable"</td>
<td align="left">flatcar-stable, flatcar-beta, flatcar-alpha</td>
</tr>
<tr>
<td align="left">disk_size</td>
<td align="left">Size of the EBS volume in GB</td>
<td align="left">30</td>
<td align="left">100</td>
</tr>
<tr>
<td align="left">disk_type</td>
<td align="left">Type of the EBS volume</td>
<td align="left">"gp3"</td>
<td align="left">standard, gp2, gp3, io1</td>
</tr>
<tr>
<td align="left">disk_iops</td>
<td align="left">IOPS of the EBS volume</td>
<td align="left">0 (i.e. auto)</td>
<td align="left">400</td>
</tr>
<tr>
<td align="left">worker_target_groups</td>
<td align="left">Target group ARNs to which worker instances should be added</td>
<td align="left">[]</td>
<td align="left">[aws_lb_target_group.app.id]</td>
</tr>
<tr>
<td align="left">worker_price</td>
<td align="left">Spot price in USD for worker instances or 0 to use on-demand instances</td>
<td align="left">0/null</td>
<td align="left">0.10</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">network_mtu</td>
<td align="left">CNI interface MTU (calico only)</td>
<td align="left">1480</td>
<td align="left">8981</td>
</tr>
<tr>
<td align="left">host_cidr</td>
<td align="left">CIDR IPv4 range to assign to EC2 instances</td>
<td align="left">"10.0.0.0/16"</td>
<td align="left">"10.1.0.0/16"</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>
<tr>
<td align="left">worker_node_labels</td>
<td align="left">List of initial worker node labels</td>
<td align="left">[]</td>
<td align="left">["worker-pool=default"]</td>
</tr>
</tbody>
</table>
<p>Check the list of valid <a href="https://aws.amazon.com/ec2/instance-types/">instance types</a>.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Do not choose a <code>controller_type</code> smaller than <code>t2.small</code>. Smaller instances are not sufficient for running a controller.</p>
</div>
<div class="admonition tip">
<p class="admonition-title">MTU</p>
<p>If your EC2 instance type supports <a href="http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/network_mtu.html#jumbo_frame_instances">Jumbo frames</a> (most do), we recommend you change the <code>network_mtu</code> to 8981! You will get better pod-to-pod bandwidth.</p>
</div>
<h4 id="spot">Spot<a class="headerlink" href="#spot" title="Permanent link">&para;</a></h4>
<p>Add <code>worker_price = "0.10"</code> to use spot instance workers (instead of "on-demand") and set a maximum spot price in USD. Clusters can tolerate spot market interuptions fairly well (reschedules pods, but cannot drain) to save money, with the tradeoff that requests for workers may go unfulfilled.</p>
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