49 articles
Learn what OCI (Open Container Initiative) is, what it standardizes, and why it matters for DevOps engineers. Covers image format, runtime spec, distribution spec, and practical tools like skopeo.
Learn what Docker multi-stage builds are and why they matter. Includes real examples shrinking a Go app from 800MB to 15MB and a Node.js app from 600MB to 80MB.
Building Docker images for both ARM64 and AMD64 fails with QEMU errors, manifest issues, or wrong architecture? Here are the exact fixes.
Docker and Kubernetes containers are built on Linux cgroups and namespaces. Understanding these fundamentals helps you debug container issues and set resource limits properly.
Nixpacks (used by Railway), Buildpacks (used by Heroku/Cloud Native), and Dockerfile are three ways to build container images. Honest comparison for DevOps engineers.
Honest review of Earthly after using it for Docker-based builds across GitHub Actions, GitLab CI, and local development. What it solves and where it falls short.
Docker layer caching can make your builds 10x faster or silently break them. Here's exactly how it works and how to use it properly.
Three serious container image scanning tools, one decision. Trivy, Grype, and Snyk each solve container security differently. Here's the honest comparison — speed, accuracy, CI/CD integration, and cost.
GitHub Actions is everywhere but Dagger and Earthly are challenging it hard. Here's an honest comparison of all three — performance, portability, learning curve, and when to use each.
Container image layers are the building blocks of Docker images. Learn how layers work, why they matter for build speed and security, and how to keep your images lean.
Multi-stage Docker builds failing mid-build? Fix RUN cache misses, COPY path errors, wrong base image, build args not passing between stages, and secret leaking in intermediate layers.
Build a tool that scans Dockerfiles for security issues using Claude API — finds hardcoded secrets, root users, unscanned base images, and missing security best practices.
Your Docker build works perfectly on your machine but fails in GitHub Actions, GitLab CI, or Jenkins. Here's every reason this happens and exactly how to fix it.
Getting 'no space left on device' during docker build? Here's exactly what's eating your disk and the commands to fix it fast without losing your images.
BuildKit is Docker's modern build engine. It makes your Docker builds faster, more secure, and more efficient. Here's what it actually does and why you should use it.
Every container needs a runtime to actually run. Docker has one. Kubernetes has one. They're different. Here's what a container runtime is, why it matters, and how containerd, runc, CRI-O, and Docker relate to each other.
Docker daemon fails to start, or the systemd service crashes immediately. Here's how to diagnose dockerd startup failures from storage driver conflicts to corrupted config files.
Three tools for running Kubernetes on your laptop. They're not all equal — kind is fastest for CI, k3d is lightest for dev, minikube has the best feature set. Here's the full comparison.
Feed any Dockerfile to Claude and get back a production-ready version with smaller image size, better layer caching, security fixes, and an explanation of every change.
Docker Compose lets you define and run multi-container applications with a single file. Here's what it does, how it works, and when to use it — explained simply.
Docker builds taking 10+ minutes every time? Here's how to fix layer caching, use BuildKit properly, and cut build times by 80% with multi-stage builds and cache mounts.
Building Docker images in Kubernetes CI/CD? Kaniko, BuildKit, and Docker-in-Docker all do it differently. Here's which one to use and why.
How do Docker containers talk to each other and to the outside world? Here's what Docker networking is, the difference between bridge, host, and overlay networks, and practical examples you'll use every day.
Docker Swarm is simpler. Kubernetes is more powerful. But which one is actually right for your use case? Honest comparison of architecture, complexity, scalability, and when to pick each in 2026.
docker push to ECR fails with 'Access Denied' or 'no basic auth credentials'. Here's every cause — expired token, wrong region, missing IAM permissions, ECR URI mismatch — and the exact fix for each.
Containers lose all data when they stop — Docker volumes fix that. Here's what Docker volumes are, how they work, the difference between volumes, bind mounts, and tmpfs, and when to use each.
Getting 'permission denied' or 'unauthorized: authentication required' when pushing Docker images in GitHub Actions? Here are all the causes and fixes.
Getting 'connection refused' between Docker Compose containers? Here are the 7 most common causes and how to fix each one, with working examples.
Deploy your own ChatGPT-like interface on Kubernetes using Ollama for local LLMs and OpenWebUI for the frontend. Full setup with GPU support and persistent storage.
Where you store your Docker images matters for cost, security, and CI/CD speed. Here's a detailed comparison of GHCR, Docker Hub, and AWS ECR to help you pick the right one.
Kubernetes deprecated Docker as a runtime in 2020. In 2026, containerd and CRI-O run most production clusters. Here's the difference and which one to pick.
A complete end-to-end DevSecOps pipeline with SAST, container scanning, secrets detection, DAST, and supply chain security using open-source tools.
Your ECS task starts and then immediately stops or keeps restarting. Here's every reason this happens and how to debug and fix it.
Step-by-step guide to building a production CI/CD pipeline that builds, scans, and pushes Docker images to AWS ECR using GitHub Actions.
EKS, ECS, Fargate — AWS has three ways to run containers. They overlap, but the right choice depends on your workload. Here's how to decide.
What is a container registry, why do you need one, and which one should you use? Docker Hub vs ECR vs GCR vs GitHub Container Registry — simply explained.
Complete guide to Podman: daemonless containers, rootless security, Docker compatibility, pods, systemd integration, and why teams are switching from Docker in 2026.
Wasm is coming for your containers. With WASI Preview 2, SpinKube, and wasmCloud gaining traction, WebAssembly might replace sidecars and lightweight microservices. Here's why.
OOMKilled crashes killing your pods? Here's the real cause, how to diagnose it fast, and the exact steps to fix it without breaking production.
CrashLoopBackOff, OOMKilled, exit code 1, exit code 137 — Docker containers restart for specific, diagnosable reasons. Here is how to identify the exact cause and fix it in minutes.
Your pod says Pending and nothing is happening. Here's how to diagnose every possible reason — insufficient resources, taints, PVC issues, node selectors — and fix them fast.
A complete guide to rolling updates, PodDisruptionBudgets, readiness probes, preStop hooks, and graceful shutdown — everything you need to deploy without dropping a single request.
A step-by-step guide to building a complete DevSecOps pipeline. Learn how to embed security scanning, SAST, secrets detection, and container vulnerability scanning into your CI/CD workflow using GitHub Actions.
Master Docker Compose in 2026. Learn how to write docker-compose.yml files, manage volumes, networks, environment variables, health checks, and run multi-container apps the right way.
The most complete Kubernetes troubleshooting guide for 2026. Learn how to diagnose and fix Pod crashes, ImagePullBackOff, OOMKilled, CrashLoopBackOff, networking issues, PVC problems, node NotReady, and more — with exact kubectl commands.
A complete Docker security checklist for production. Cover image hardening, runtime security, secrets management, network isolation, and scanning — with real examples.
Learn how to build a production-grade CI/CD pipeline using GitHub Actions. Covers Docker image builds, automated testing, secrets management, and Kubernetes deployments — with real workflow files.
A comprehensive guide to the essential DevOps tools for containers, CI/CD, infrastructure, monitoring, and security — curated for practicing engineers.
What is Docker, why engineers use it, and how to get started with containers from scratch. A practical, no-fluff guide.