Docker
Explore Docker articles in DevOps.
Docker Introduction
Learn what Docker is, how containers differ from virtual machines, and why containerization matters for modern development and DevOps.
Docker Architecture
Understand the Docker client, dockerd daemon, containerd, runc, registries, and the Linux kernel features that make containers work.
Dockerfile Basics
Write Dockerfiles that build correctly and cache well: FROM, COPY, RUN, CMD, ENTRYPOINT, ENV, ARG, USER, and .dockerignore explained.
Docker Image vs Container
Learn how Docker images and containers differ, how image layers and the writable layer work, and how a container's lifecycle behaves.
Docker Commands
A practical reference to the Docker CLI commands you use daily: run, exec, logs, build, ps, inspect, and cleanup, with examples.
Docker Volumes
Persist container data with Docker volumes, bind mounts, and tmpfs mounts, and learn when to use each, with backup and Compose examples.
Docker Networking
Understand Docker bridge, host, and none networks, user-defined networks, DNS-based service discovery, and port publishing with examples.
Docker Compose
Define and run multi-container applications with Docker Compose v2: services, networks, volumes, healthchecks, depends_on, and profiles.
Dockerize Spring Boot App
Containerize a Spring Boot application with a production-ready Dockerfile: JRE base image, non-root user, health check, and JVM memory flags.
Docker Multi Stage Build
Use multi-stage Docker builds to compile in a full toolchain image and ship a small runtime image, with Maven, Spring Boot, and Go examples.
Docker Security
Secure Docker images and containers: non-root users, read-only filesystems, dropped capabilities, secrets handling, and image scanning.
Docker Image Optimization
Shrink Docker images and speed up builds with slim base images, layer ordering, multi-stage builds, .dockerignore, and BuildKit cache mounts.
Docker Registry
Learn how Docker registries store images: tagging, pushing and pulling, Docker Hub, private registries, authentication, and tag strategy.
Docker Troubleshooting
Diagnose common Docker problems: crashing containers, exit codes, OOM kills, port conflicts, networking failures, and full disks, with commands.
Docker Production Best Practices
Run Docker in production reliably: pinned images, health checks, resource limits, logging, secrets, graceful shutdown, and a deployment checklist.