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dockerCommands.md

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Docker Commands

1. Basic Commands

  • Run a Container: docker run [OPTIONS] IMAGE [COMMAND]

    • Example: docker run --name my-container -d nginx
    • -d: Run container in detached mode (in the background).
    • --name: Name the container for easier reference.

  • List Containers:

    • Running containers: docker ps
    • All containers (including stopped ones): docker ps -a

  • Start/Stop a Container:

    • Start: docker start CONTAINER_ID
    • Stop: docker stop CONTAINER_ID
    • Restart: docker restart CONTAINER_ID

  • Remove a Container: docker rm CONTAINER_ID

    • Use docker rm -f CONTAINER_ID to force-remove a running container.

  • Remove an Image: docker rmi IMAGE_ID

    • Use docker rmi -f IMAGE_ID to force-remove an image.

  • Execute a Command Inside a Running Container: docker exec -it CONTAINER_ID COMMAND

    • Example: docker exec -it my-container /bin/bash (access a shell in the container).

2. Image Management

  • Build an Image: docker build -t IMAGE_NAME PATH

    • Example: docker build -t my-app . (builds an image from the Dockerfile in the current directory).
    • -t: Tag an image with a name (optional).

  • Pull an Image: docker pull IMAGE

    • Example: docker pull nginx (downloads the latest nginx image from Docker Hub).

  • List Images: docker images

    • Shows all images on your system, with details like tag and size.

  • Tag an Image: docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

    • Example: docker tag my-app:latest my-repo/my-app:v1.0

  • Push an Image to a Repository: docker push IMAGE

    • Example: docker push my-repo/my-app:v1.0

3. Networking

  • Expose Ports: Use -p or --publish when running a container to map a host port to a container port.

    • Example: docker run -d -p 8080:80 nginx
      • Maps port 8080 on the host to port 80 in the container.

  • List Networks: docker network ls

    • Shows all Docker networks on the host.

  • Create a Network: docker network create NETWORK_NAME

    • Example: docker network create my-network

  • Connect a Container to a Network: docker network connect NETWORK_NAME CONTAINER_NAME

    • Example: docker network connect my-network my-container

  • Disconnect a Container from a Network: docker network disconnect NETWORK_NAME CONTAINER_NAME

4. Volumes and Storage

  • Create a Volume: docker volume create VOLUME_NAME

    • Example: docker volume create my-volume

  • List Volumes: docker volume ls

  • Mount a Volume: Use -v or --mount to attach a volume to a container.

    • docker run -d -v VOLUME_NAME:/path/in/container IMAGE
    • Example: docker run -d -v my-volume:/data nginx

  • Remove a Volume: docker volume rm VOLUME_NAME

5. Inspecting and Monitoring

  • Inspect a Container or Image: docker inspect CONTAINER_ID or docker inspect IMAGE_ID

    • Provides detailed configuration and status information.

  • Container Logs: docker logs CONTAINER_ID

    • Example: docker logs -f my-container (follows logs in real-time).

  • Container Resource Usage: docker stats

    • Shows CPU, memory, and I/O usage of running containers.

6. Docker Compose (for Multi-Container Applications)

  • Start Containers: docker-compose up

    • Use -d to run in detached mode: docker-compose up -d

  • Stop Containers: docker-compose down

  • Rebuild Images: docker-compose build

    • Rebuild images if the Dockerfile or dependencies have changed.

  • View Logs: docker-compose logs

    • Use -f for real-time logs: docker-compose logs -f

These commands should cover a wide range of Docker tasks, from setting up containers and managing images to handling networks and storage. Let me know if you need more details on any specific command!