Practice containerization, Dockerfiles, networking, and orchestration concepts
Start Practicing NowMaster Dockerfile best practices and multi-stage builds
Understand Docker networks, volumes, and container communication
Learn Docker Compose and container orchestration basics
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Dockerfile and image creation
Docker Compose and multi-container apps
Docker networking and volumes
Container lifecycle management
Multi-stage builds and optimization
Docker security best practices
A: Images are read-only templates with application code, dependencies, and configuration. Containers are running instances of images - they're isolated processes with their own filesystem, network, and process space. One image can create multiple containers. Images are built in layers, containers add a writable layer on top.
A: Each Dockerfile instruction creates a layer. Layers are cached and reused across images, saving space and build time. Layers are read-only and stacked. When rebuilding, only changed layers and subsequent ones rebuild. Best practice: put frequently changing instructions (COPY code) last, stable ones (dependencies) first.
A: Multi-stage builds use multiple FROM statements in one Dockerfile. Build artifacts in one stage, copy only needed files to final stage. Benefits: smaller final images (no build tools), separation of build and runtime dependencies, improved security. Example: build with node:16, run with node:16-alpine copying only dist/.
A: Volumes are managed by Docker, stored in Docker area (/var/lib/docker/volumes), better for persistence. Bind mounts map any host path to container. Volumes are portable, work on Windows/Mac, can be backed up easily. Use volumes for data persistence, bind mounts for development (hot reload).
Master Dockerfile best practices: layer caching, .dockerignore, multi-stage builds
Understand Docker networking: bridge, host, overlay networks
Know the difference between CMD and ENTRYPOINT
Practice with docker-compose for multi-container applications
Understand container security: running as non-root user, scanning for vulnerabilities
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