docker

name	docker
description	Build, run, and manage Docker containers and images. Use when the user asks about containers, Docker builds, logs, or deployment.
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Docker Skill

Use docker and docker compose via the Bash tool.

Build Image

# Standard build
docker build -t myapp:latest .

# Build with args, specific Dockerfile
docker build -t myapp:v1.2.0 \
  --build-arg NODE_ENV=production \
  -f deploy/Dockerfile \
  .

# Multi-platform build
docker buildx build --platform linux/amd64,linux/arm64 \
  -t ghcr.io/owner/myapp:latest --push .

Run Container

# Foreground
docker run --rm -it myapp:latest

# Background daemon
docker run -d \
  --name myapp \
  -p 8080:8080 \
  -v "$(pwd)/data:/data" \
  -e DATABASE_URL="$DATABASE_URL" \
  --restart unless-stopped \
  myapp:latest

Container Management

# List
docker ps                     # running
docker ps -a                  # all including stopped

# Logs
docker logs myapp -f          # follow
docker logs myapp --tail 100  # last 100 lines

# Execute inside container
docker exec -it myapp bash
docker exec myapp cat /etc/hosts

# Stop / Remove
docker stop myapp
docker rm myapp
docker rm -f myapp            # force stop + remove

Image Management

docker images                             # list local images
docker pull ghcr.io/owner/app:latest      # pull
docker rmi old-image:v1.0                 # remove
docker tag myapp:latest myapp:v1.2.0      # tag
docker push ghcr.io/owner/app:latest      # push to registry

Docker Compose

docker compose up -d                       # start all services
docker compose down                        # stop + remove containers
docker compose down -v                     # also remove volumes
docker compose logs -f web                 # follow service logs
docker compose exec web bash               # shell into service
docker compose ps                          # status
docker compose restart web                 # restart one service

System Cleanup

docker system prune -f           # remove unused containers, networks, images
docker system prune -af          # also remove unused images (aggressive)
docker volume prune -f           # remove unused volumes
docker system df                 # disk usage breakdown

Inspect & Debug

# Container details
docker inspect myapp | python3 -m json.tool

# Resource usage
docker stats --no-stream

# Port mappings
docker port myapp

# Network
docker network ls
docker network inspect bridge

Registry Login

# GitHub Container Registry
echo "$GITHUB_TOKEN" | docker login ghcr.io -u "$GITHUB_ACTOR" --password-stdin

# Docker Hub
docker login -u "$DOCKERHUB_USER" -p "$DOCKERHUB_TOKEN"

Tips

• Use --rm for one-off containers that should auto-clean up.
• Always pin image versions in production (myapp:v1.2.0 not latest).
• Use docker compose for multi-container setups.
• Check resource usage with docker stats before running heavy builds.