Docker Cheatsheet
Some frequent docker commands parameters
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Here is a Docker cheat sheet covering the most important commands and concepts from installing to running containers and cleaning up:
Installation
On Ubuntu
sudo apt install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
sudo apt update
sudo apt install docker-ce
sudo systemctl start docker
Docker Compose Installation
sudo curl -L "https://github.com/docker/compose/releases/download/1.24.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
sudo ln -s /usr/local/bin/docker-compose /usr/bin/docker-compose
docker-compose --version
``").
## General Docker Commands
### Version and System Info
```bash
docker version # Displays Docker CLI and daemon versions
docker system info # Lists data about your Docker environment
docker help # View the help index
docker <command> --help # View help information for a specific command
Login and Logout
docker login # Login to Docker Hub
docker logout # Logout from Docker Hub
Image Management
List Images
docker images # List all images
docker images -a # List all images, including intermediate images
Pull Images
docker pull <image-name:version> # Download an image from Docker Hub
Build Images
docker build -t <image-name> . # Build an image from the current directory's Dockerfile
docker build -f <Dockerfile-path> -t <image-name> . # Build an image from a specific Dockerfile
docker build --build-arg foo=bar . # Build an image with build arguments
docker build --pull . # Pull updated versions of images referenced in FROM instructions
docker build --quiet . # Build an image without emitting output
Tag and Push Images
docker tag <local-image-name> <username>/<preferred-image-name>
docker push <username>/<preferred-image-name>
Remove Images
docker rmi <image-name> # Remove a specific image
docker image prune # Remove unused images
docker image prune -a # Remove all unused images
Container Management
Run Containers
docker run -itd --name <container-name> <image-name> # Run a container in detached mode
docker run -it -p <host-port>:<docker-port> <image-name> # Run a container with port mapping
docker run -it --name <container-name> <image-name> # Run a container interactively
List Containers
docker ps # List running containers
docker ps -a # List all containers
docker ps -s # List running containers with CPU and memory usage
Start, Stop, and Restart Containers
docker start <container-name> # Start a stopped container
docker stop <container-name> # Stop a running container
docker restart <container-name> # Restart a container
Remove Containers
docker rm <container-name> # Remove a stopped container
docker rm -f <container-name> # Forcefully remove a container
docker stop $(docker ps -a -q) && docker rm $(docker ps -a -q) # Remove all containers
Attach to Containers
docker attach <container-name> # Attach to a running container
docker exec -it <container-name> bash # Run a command in a running container interactively
Inspect Containers
docker inspect <container-name> # Inspect a container
docker logs <container-name> # View a container's logs
docker port <container-name> # Show a container's port mappings
Network Management
docker network ls # List all networks
docker network create <network-name> # Create a new network
docker network rm <network-name> # Remove a network
Volume Management
docker volume ls # List all volumes
docker volume create <volume-name> # Create a new volume
docker volume rm <volume-name> # Remove a volume
docker run -v <host-path>:<container-path> <image-name> # Mount a volume
Docker Compose
Basic Commands
docker-compose up # Start services defined in docker-compose.yml
docker-compose up -d # Start services in detached mode
docker-compose down # Stop and remove services
docker-compose ps # List running services
docker-compose logs # View logs of services
docker-compose start # Start services
docker-compose stop # Stop services
docker-compose pause # Pause services
docker-compose unpause # Unpause services
Dockerfile Commands
Build Image from Dockerfile
docker build -t <image-name> <Dockerfile-path> # Build an image from a Dockerfile
Example Dockerfile
FROM <base-image>
RUN <command>
COPY <source> <destination>
EXPOSE <port>
CMD ["<command>", "<argument>"]
Security and Secrets
Docker Secrets
docker secret create <secret-name> <file> # Create a secret
docker secret ls # List all secrets
docker secret rm <secret-name> # Remove a secret
Docker Security
- Use Docker secrets to centrally manage sensitive data and securely transmit it to containers.
- Secrets are encrypted during transit and at rest in a Docker swarm.
Cleanup
Remove Unused Resources
docker system prune # Remove unused data (images, containers, networks, volumes)
docker image prune # Remove unused images
docker container prune # Remove unused containers
docker network prune # Remove unused networks
docker volume prune # Remove unused volumes
Remove untagged images
Sometimes after big good compile there is a picture like this fomr the docker images command:
to remove those images with
docker rmi $(docker images --filter “dangling=true” -q --no-trunc)
this above is old and incompatible. dangling=true parameter is obsolete. Use
docker system prune
it will ask:
WARNING! This will remove:
- all stopped containers
- all volumes not used by at least one container
- all networks not used by at least one container
- all dangling images
You might decide to say Yes to this warning…
This cheat sheet covers the essential commands and concepts needed to manage Docker containers, images, networks, volumes, and more. For a deeper dive, refer to the detailed guides and tutorials available online.
