Cheatsheet

# Images
docker build -t myapp:1.2.3 .
docker build --target=build -t myapp:build .       # stage
docker build --build-arg NODE_ENV=production .
docker image ls
docker image prune -f
docker pull node:20-alpine
docker push myrepo/myapp:1.2.3

# Containers
docker run --rm -it myapp:1.2.3 sh
docker run -d --name api -p 3000:3000 -e DB_URL=... myapp:1.2.3
docker ps                       # running
docker ps -a                    # all
docker logs -f api
docker exec -it api sh
docker stop api && docker rm api
docker container prune -f

# Volumes + bind mounts
docker run -v $(pwd):/app -w /app node:20 npm test
docker volume create pgdata
docker run -v pgdata:/var/lib/postgresql/data postgres:16

# Networks
docker network create app
docker run --network=app --name db postgres:16
docker run --network=app -e DB_HOST=db myapp

# Compose
docker compose up -d
docker compose logs -f web
docker compose exec web sh
docker compose down -v          # stop AND remove volumes (destructive)

# Inspect + debug
docker inspect api
docker top api
docker stats
docker history myapp:1.2.3

# BuildKit cache and multi-platform
docker buildx build --platform linux/amd64,linux/arm64 -t myapp:1.2.3 --push .

# Disk usage
docker system df
docker system prune -a --volumes -f   # nuke everything

# Build + run + push
docker build -t img .
docker run -d -p 8080:80 img
docker push reg/img:tag