https://akshayd-dev.pages.dev/tags/devops/ Recent content in Devops on Akshay Deshpande Hugo en-us Thu, 20 Nov 2025 00:00:00 +0000 https://akshayd-dev.pages.dev/posts/prometheus-static-dynamic-scraping-on-eks/ Thu, 20 Nov 2025 00:00:00 +0000 https://akshayd-dev.pages.dev/posts/prometheus-static-dynamic-scraping-on-eks/ <p>This note is a mental model for <strong>how Prometheus discovers and scrapes metrics in Kubernetes</strong>.</p> <p>The lens I want to keep throughout is:</p> <ol> <li> <p><strong>Where will the scrape config file sit?</strong><br> (Prometheus repo vs application repo)</p> </li> <li> <p><strong>In which namespace will the serviceMonitor sit?</strong><br> (and how Prometheus finds it)</p> </li> </ol> <p>At a high level there are two ways to tell Prometheus about a <code>/metrics</code> endpoint:</p> <ol> <li> <p><strong>Static via</strong> in the Prometheus config file.</p> </li> <li> <p><strong>Dynamic via</strong> (CRD from Prometheus Operator) with label‑based discovery.</p> https://akshayd-dev.pages.dev/posts/memory-management-java-containers-on-k8s/ Sat, 08 Feb 2025 00:00:00 +0000 https://akshayd-dev.pages.dev/posts/memory-management-java-containers-on-k8s/ <p>This page documents a few aspects of memory management on Java containers on K8s clusters.</p> <p>For java containers, memory management on K8s have various factors:</p> <ul> <li> <p>Xmx and Xms limits managed by java</p> </li> <li> <p>Request/limit values for the container</p> </li> <li> <p>HPA policies used for scaling the number of pods</p> </li> </ul> <p>Misconfigurations / misunderstanding of any of these parameters leads to OOMs of java containers on K8s clusters.</p> <h3 id="memory-management-on-java-containers">Memory management on java containers:</h3> <ul> <li> <p><code>-XX:+UseContainerSupport</code> is enabled by default form java 10+</p>