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Improvements for creating EC2 clusters

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Sebastiaan van Steenis
2018-07-18 10:09:14 -07:00
committed by Denise
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layouts/shortcodes/step_create-cluster_node-pools.html
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<p>Add one or more <strong>Node Pools</strong> to your cluster. A <em>node pool</em> is a set of virtual machines configured identically to your Linux host. However, each node in the pool also has additional Kubernetes master and worker components installed.<p>
<p>Add one or more <strong>Node Pools</strong> to your cluster.<br/><br/>A <strong>Node Pool</strong> is a collection of nodes based on a Node Template. A Node Template defines the configuration of a Node, like what Operating System image, number of CPUs and amount of RAM. Each Node Pool can have one or more Nodes Roles associated with it.</p>
<blockquote>
<p><strong>Notes:</strong></p>
<ul>
<li>After you create each node template, you can use it to create additional node pools.</li>
<li>Each Kubernetes role (i.e. <code>etcd</code>, <code>Control</code>, and <code>Worker</code>) must be filled. You can either apply all three roles to one pool or spread them around.</li>
<li>Ideally, you should have at least three <code>etcd</code> nodes so that your cluster can fail over to another if a etcd node goes down.</li>
<li>After you create a Node Template, it will be saved and you will be able to re-use it in additional Node Pools.</li>
<li>Each Node Role (i.e. <code>etcd</code>, <code>Control Plane</code>, and <code>Worker</code>) must be fulfilled. Although it is possible to apply multiple Node Roles to a Node Pool, this is not recommended.</li>
<li>The recommended setup is to have a Node Pool with the <code>etcd</code> Node Role and a count of three, a Node Pool with the <code>Control Plane</code> Node Role and a count of at least two, and a Node Pool with the <code>Worker</code> Node Role and a count of at least two. Regarding the <code>etcd</code> Node Role, refer to the <a href="https://coreos.com/etcd/docs/latest/v2/admin_guide.html#optimal-cluster-size" target="_blank">etcd Admin Guide</a>.</li>
</ul>
</blockquote>