Latest Articles - Page 35

Find deprecated apiVersion strings in manifests, map legacy APIs to supported replacements, migrate Ingress from v1beta1 to v1, validate with server-side dry-run, and apply corrected YAML on any cluster.

Learn kubectl apply, edit, patch, replace, diff, and dry-run with practical Deployment examples and guidance on declarative versus live updates.

Use Kubernetes Kustomize bases and overlays to patch manifests, change images and replicas, generate configuration, preview changes, and apply with kubectl.

Learn Kubernetes blue-green and canary deployments with YAML examples. Switch Service selectors, test mixed traffic, promote releases, and roll back.

Install Helm, deploy and customize charts, upgrade and roll back releases, inspect history, and create, render, package, and test a basic Helm chart.

Create and scale Kubernetes Deployments, configure rolling updates with maxSurge and maxUnavailable, pause rollouts, inspect revisions, and roll back failed releases.

Use Kubernetes subPath to mount one file or directory, preserve image files, split a volume across paths, and handle ConfigMap update limitations.

Compare Kubernetes Job vs CronJob for one-time and scheduled batch work, including controller flow, retries, concurrency, suspension, and when to use each.

Create a Kubernetes Job with YAML, watch completions and parallelism, control retries with backoffLimit, limit runtime with activeDeadlineSeconds, and clean up finished Jobs with ttlSecondsAfterFinished.

Create a static PersistentVolume, bind a PersistentVolumeClaim, mount the claim in a Pod, verify data survives Pod deletion, and troubleshoot Pending claims and reclaim policies.

Learn Kubernetes volumes with YAML examples for emptyDir, ConfigMap, Secret, projected, hostPath, shared mounts, and Pod volume lifetime.

Learn Kubernetes CronJobs with YAML examples. Configure schedules, time zones, concurrency, missed-run deadlines, suspension, history, and manual Jobs.

Create a Kubernetes StatefulSet with a headless Service and volumeClaimTemplates, verify stable Pod names and DNS, test persistent storage across Pod recreation, scale in ordinal order, and manage rolling updates and PVC …

Learn Kubernetes sidecar containers with YAML. Compare native sidecars, shared volumes, localhost communication, adapter, and ambassador patterns.

Create a Kubernetes ReplicaSet with YAML, verify DESIRED and READY counts, test Pod replacement and scaling, compare ReplicaSet with Deployment, and see how Deployments manage ReplicaSets.

Compare Kubernetes Pod vs Deployment: key differences, minimal YAML for each, what happens when a Pod is deleted, scaling and updates, and when to use a bare Pod or a Deployment.

Create Kubernetes init containers with YAML, run sequential setup before application containers start, share an emptyDir volume, inspect Init status and logs, understand failure and restart behaviour, and compare init …

Compare Kubernetes Deployment vs StatefulSet: pod identity, storage, scaling, rollouts, when to use each, common selection mistakes, and a decision checklist for stateless versus stateful workloads.

Create a Kubernetes DaemonSet with YAML, verify one Pod per eligible node, restrict placement with nodeSelector, tolerate control-plane taints, replace missing Pods, and perform rolling updates and rollback.

Fix Too many open files (EMFILE) and set ulimit-style nofile, nproc, and file size limits in Kubernetes pods using a prlimit or ulimit entrypoint—separate from CPU and memory resources.limits, with Pod examples you can …

Compare Kubernetes Deployment vs DaemonSet by Pod placement, scaling, updates, and use cases. Learn when to choose application replicas or per-node agents.

Learn what a Kubernetes Pod is, create and inspect Pods with YAML and kubectl, read phases and container states, configure restartPolicy and lifecycle hooks, and understand graceful shutdown versus controller-managed …

Compare Kubernetes Pod, ReplicaSet, Deployment, StatefulSet, DaemonSet, Job, and CronJob workload resources and choose the right controller for stateless, stateful, node-level, and batch applications.

Compare Kubernetes labels and annotations: what each field is for, how selectors treat them, value limits, and when to use labels for grouping versus annotations for descriptive metadata.

Learn what Kubernetes annotations are, add them in YAML or with kubectl annotate, view and remove annotation keys, and choose annotations instead of labels for non-identifying metadata.

Learn how Kubernetes labels and selectors work, add and remove labels with kubectl on Pods, nodes, and Deployments, and use matchLabels and matchExpressions in YAML.

Use kubectl api-resources, api-versions, and explain to discover supported resource types, API versions, and valid YAML fields on any Kubernetes cluster.

Install kubectl on Rocky Linux, RHEL, Ubuntu, or Debian, then configure kubeconfig, contexts, and remote access to a Kubernetes cluster.

Learn the Linux boot process from UEFI or BIOS through GRUB, the kernel, initramfs, and systemd, with inspection commands and troubleshooting.

Create coordinated LVM snapshot sets with snapm, boot into a snapshot through Boom and GRUB, inspect an earlier system state, revert failed changes, monitor snapshot capacity, and delete snapshot sets on Rocky Linux …