Docker Cheat Sheet

Images

• Build Build an image from the Dockerfile in this folder.Fill in docker build -t {{name}} .
• List images Images on this machine, with their sizes.Copy docker images
• Pull Download an image from a registry.Fill in docker pull {{image}}
• Tag Give an image a second name, such as user/app:1.0, before pushing it.Fill in docker tag {{image}} {{new_tag}}
• Push Upload an image to a registry.Fill in docker push {{image}}
• Remove image Delete an image from this machine.Fill in docker rmi {{image}}

Run a container

In -p 8080:80 and -v ${PWD}:/app, your machine is on the left and the container is on the right.

• Try an image Open a shell in a new container and delete the container when you exit.Fill in docker run --rm -it {{image}} sh
• Background, named Start it in the background under a name you choose.Fill in docker run -d --name {{name}} {{image}}
• Publish a port Port 8080 on your machine reaches port 80 in the container.Fill in docker run -d -p 8080:80 {{image}}
• Env variable Pass one environment variable.Fill in docker run -e KEY=value {{image}}
• Env file Pass every variable in a .env file.Fill in docker run --env-file .env {{image}}
• Mount this folder The current folder shows up at /app. ${PWD} works in PowerShell and bash.Fill in docker run -v ${PWD}:/app {{image}}

Manage containers

• Running Containers that are running now.Copy docker ps
• All containers Stopped ones included.Copy docker ps -a
• Stop Stop a container gracefully.Fill in docker stop {{container}}
• Start Start a stopped container again.Fill in docker start {{container}}
• Remove Delete a container, stopping it first if needed.Fill in docker rm -f {{container}}
• Stop all Stop every running container. Works in PowerShell and bash, not in cmd.Copy docker stop $(docker ps -q)

Look inside

• Follow logs Stream the output. Add --tail 100 to skip the old lines.Fill in docker logs -f {{container}}
• Shell inside Open a shell in a running container. Use bash if the image has it.Fill in docker exec -it {{container}} sh
• Inspect The full configuration as JSON: mounts, network, environment.Fill in docker inspect {{container}}
• Live usage CPU, memory and network for each container, updating live.Copy docker stats
• Port mappings Which ports on your machine lead into the container.Fill in docker port {{container}}
• Copy a file out Copy a file from the container into the current folder.Fill in docker cp {{container}}:{{path}} .

Docker Compose

down keeps your volumes. Add -v to delete them too, and with them the data in your database.

• Start Start every service in the background.Copy docker compose up -d
• Rebuild and start Rebuild the images first. Use it after changing a Dockerfile.Copy docker compose up -d --build
• Stop Stop and remove the containers and network. Volumes stay.Copy docker compose down
• Logs Stream the logs of every service. Add a service name for just one.Copy docker compose logs -f
• Status The services, their state and their ports.Copy docker compose ps
• Shell in a service Open a shell in a running service.Fill in docker compose exec {{service}} sh

Free up disk space

After prune -a, the next build or pull downloads everything again.

• Disk usage How much space images, containers, volumes and build cache use.Copy docker system df
• Clean up Remove stopped containers, unused networks, dangling images and build cache.Copy docker system prune
• Deep clean Also remove every image no container uses, and unused anonymous volumes.Copy docker system prune -a --volumes
• Remove stopped Remove all stopped containers.Copy docker container prune
• Unused images Remove every image that no container uses.Copy docker image prune -a
• Unused volumes Remove unused anonymous volumes. Add -a to include named ones.Copy docker volume prune