https://samarthya.me/tags/probes/Recent content in Probes on SamarthyaHugo -- gohugo.ioen© Samarthya 2018-2026. All rights reserved.Sat, 22 Aug 2020 10:53:05 +0000https://samarthya.me/posts/probes-k8s/Sat, 22 Aug 2020 10:53:05 +0000https://samarthya.me/posts/probes-k8s/<p>In this blog we will be talking about Liveness, Readiness and Startup probes of a container.</p> <div class="lead text-neutral-500 dark:text-neutral-400 !mb-9 text-xl"> A <em><strong><a href="https://samarthya.me/posts/services-k8s/" >Service</a></strong></em> in Kubernetes is an abstraction which defines a logical set of Pods and a policy by which to access them. — - Life without a service </div> <h2 class="relative group">What is Kubelet? <div id="what-is-kubelet" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#what-is-kubelet" aria-label="Anchor">#</a> </span> </h2> <ul> <li><code>Kubelet</code> is a primary node agent that runs on every node.</li> <li>Works in term of PodSpec, that describes a POD (JSON or Yaml).</li> </ul> <h2 class="relative group">Liveness Probe <div id="liveness-probe" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#liveness-probe" aria-label="Anchor">#</a> </span> </h2> <ul> <li>It is used by <code>kubelet</code> to decide when to restart the container.</li> <li><code>periodSeconds</code> defines when the <code>kubelet</code> check periodically.</li> <li><code>initialDelaySeconds</code> specifies the initial wait before checking.</li> </ul> <p>I just created a single container pod that will run <code>touch</code> command to create a file and then it deletes that specific file after a delay, on which the livenessProbe is listening on and then once liveness fails we can check the container.</p>