How-To

A practical guide to backing up and restoring the etcd key-value database in a Kubernetes cluster. Covers snapshot-based and file-based backup methods, integrity checks, and static pod manifest updates.

A step-by-step guide to upgrading a Kubernetes cluster using kubeadm, covering control plane and worker node upgrades. Includes the full sequence from version planning through final verification.

Create a TLS secret from a certificate and key pair, then deploy a webhook server that mounts that secret to serve HTTPS on port 8443.

A practical guide to using the jcmd and jstack utilities for collecting thread dumps, heap data, and CPU information from a running JVM process. Includes ready-to-use scripts and one-liners for troubleshooting slow or hung Java applications.

A practical guide to configuring CPU, memory, and storage requests and limits in Kubernetes, covering container-level, Pod-level, and namespace-level resource controls. Includes troubleshooting steps for common scheduling and OOM issues.

Learn how to assign Kubernetes pods to specific nodes at creation time and how to reassign running pods using Binding objects. Covers scheduler behavior and common pitfalls that leave pods stuck in Pending state.