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Docker

Docker is an open-source platform for developing, shipping, and running applications in lightweight, portable containers. Containers package software and its dependencies, ensuring consistency across environments and simplifying deployment.

🌟 Key Concepts​

  • Image: A snapshot of a filesystem and parameters needed to run an application.
  • Container: A running instance of an image.
  • Dockerfile: Script with instructions to build a Docker image.
  • Docker Hub: Public registry for sharing and downloading images.

📚 Useful Links​

Cheat Sheet​

Images​

docker build -t <image> .           # Build image from Dockerfile
docker build -t <image> . --no-cache # Build without cache
docker images                       # List local images
docker rmi <image>                  # Delete image
docker image prune                  # Remove all unused images

Docker Hub​

docker login -u <username>          # Login to Docker Hub
docker push <username>/<image>      # Publish image to Docker Hub
docker search <image>               # Search for image on Docker Hub
docker pull <image>                 # Pull image from Docker Hub

General​

docker -d                           # Start Docker daemon
docker --help                       # Get help
docker info                         # System-wide info

Containers​

docker run --name <name> <image>            # Create & run container
docker run -p <host>:<container> <image>    # Map ports
docker run -d <image>                       # Run in background
docker start|stop <name>                    # Start/stop container
docker rm <name>                            # Remove stopped container
docker exec -it <name> sh                   # Shell in running container
docker logs -f <name>                       # Follow container logs
docker inspect <name>                       # Inspect container
docker ps -a                                # List all containers
docker container stats                      # Resource usage stats

📝 Notes​

  • Use .dockerignore to exclude files from builds.
  • Clean up unused images and containers regularly.
  • Use volumes for persistent data.