Docker_Essential_Commands.md

Essential Docker Commands Cheat Sheet

General Commands

1. Check Docker Version:

   docker --version

2. Show System-Wide Docker Information:

   docker info

Container Lifecycle

1. List Running Containers:

   docker ps

2. List All Containers (Running and Stopped):

   docker ps -a

3. Restart a Stopped Container:

   docker start <container_id>

4. Stop a Running Container:

   docker stop <container_id>

5. Access a Running Container (Interactive Mode):

   docker exec -it <container_id> bash

6. Remove a Specific Container:

   docker rm <container_id>

Advanced Commands

1. Run a Container in Detached Mode:

   docker run -d <image_name>

2. Remove All Stopped Containers, Unused Images, and Volumes:

   docker system prune -a --volumes

3. Run a Container with Resource Limits:

   docker run --memory="512m" --cpus="1" <image_name>

Image Management

1. List All Docker Images:

   docker images

2. Pull a Specific Image from Docker Hub:

   docker pull <image_name>:<tag>

   Example:

   docker pull ubuntu:20.04

3. Export an Image to a .tar File:

   docker save -o my_image.tar <image_name>:<tag>

4. Load an Image from a .tar File:

   docker load -i my_image.tar

5. Tag an Image:

   docker tag <image_id> <new_image_name>:<tag>

6. Push an Image to a Docker Registry:

   docker push <image_name>:<tag>

7. Remove a Specific Image:

   docker rmi <image_id>

8. Remove All Unused Images:

   docker image prune -a

Saving, Importing, and Exporting

1. Save a Docker Image to a .tar File:

   docker save -o my_image.tar <image_name>:<tag>

2. Load a Docker Image from a .tar File:

   docker load -i my_image.tar

3. Export a Container to a .tar File:

   docker export -o my_container.tar <container_id>

4. Import a Container's Filesystem from a .tar File:

   cat my_container.tar | docker import - my_container

Volume Management

1. List All Volumes:

   docker volume ls

2. Create a Named Volume:

   docker volume create <volume_name>

3. Inspect a Volume:

   docker volume inspect <volume_name>

4. Remove a Volume:

   docker volume rm <volume_name>

Networking

1. List Docker Networks:

   docker network ls

2. Create a Docker Network:

   docker network create <network_name>

3. Connect a Container to a Network:

   docker network connect <network_name> <container_id>

4. Disconnect a Container from a Network:

   docker network disconnect <network_name> <container_id>

Debugging and Troubleshooting

1. View Container Logs:

   docker logs <container_id>

2. Inspect Container Details:

   docker inspect <container_id>

3. Check Resource Usage of Containers:

   docker stats

4. Check Disk Usage of Docker Resources:

   docker system df

Commands for Docker Compose

1. Start Services Defined in docker-compose.yml:

   docker-compose up

2. Stop Services:

   docker-compose down

3. Rebuild and Start Services:

   docker-compose up --build

4. Check Logs of Services:

   docker-compose logs

Key Cleanup Commands

1. Stop All Running Containers:

   docker stop $(docker ps -q)

2. Remove All Containers (Stopped or Running):

   docker rm $(docker ps -aq)

3. Remove All Unused Images:

   docker image prune -a

4. Remove All Docker Resources (DANGEROUS):

   docker system prune -a --volumes