<p>I see that Kubernetes <code>Job</code> &amp; <code>Deployment</code> provide very similar configuration. Both can deploy one or more pods with certain configuration. So I have few queries around these:</p>
<ul>
<li>Is the pod specification <code>.spec.template</code> different in <code>Job</code> &amp; <code>Deployment</code>?</li>
<li>What is difference in <code>Job</code>'s <code>completions</code> &amp; <code>Deployment</code>'s <code>replicas</code>?</li>
<li>If a command is run in a <code>Deployment</code>'s only container and it completes (no server or daemon process containers), the pod would terminate. The same is applicable in a <code>Job</code> as well. So how is the pod lifecycle different in either of the resources?</li>
</ul>

<p>Many resources in Kubernetes use a <a href="https://kubernetes.io/docs/concepts/workloads/pods/#pod-templates" rel="noreferrer">Pod template</a>. Both <code>Deployments</code> and <code>Jobs</code> use it, because they manage Pods.</p>
<blockquote>
<p>Controllers for workload resources create Pods from a pod template and manage those Pods on your behalf.</p>
</blockquote>
<blockquote>
<p>PodTemplates are specifications for creating Pods, and are included in workload resources such as Deployments, Jobs, and DaemonSets.</p>
</blockquote>
<p>The main difference between <code>Deployments</code> and <code>Jobs</code> is <strong>how they handle a Pod that is terminated</strong>. A Deployment is intended to be a &quot;service&quot;, e.g. it should be up-and-running, so it will try to restart the Pods it manage, to match the desired number of replicas. While a Job is intended to execute and successfully terminate.</p>
