Docker Cheat Sheet - Martkos IT

Container Commands

docker runCreate & start
docker start/stopStart/stop
docker psList running
docker ps -aList all
docker rmRemove
docker logsView logs
docker exec -itRun command

Image Commands

docker imagesList images
docker pullDownload image
docker pushUpload image
docker buildBuild image
docker tagTag image
docker rmiRemove image

Volume Commands

docker volume lsList volumes
docker volume createCreate volume
docker volume rmRemove volume
docker volume inspectInspect
docker volume pruneRemove unused

Network Commands

docker network lsList networks
docker network createCreate network
docker network connectConnect container
docker network disconnectDisconnect
docker network inspectInspect

Run Options

# Common run options
docker run -d                     # Detached mode (background)
docker run -it                    # Interactive terminal
docker run --name myapp           # Assign name
docker run -p 8080:80            # Port mapping host:container
docker run -v /host:/container    # Volume mount
docker run -e VAR=value           # Environment variable
docker run --rm                   # Remove on exit
docker run --network mynet        # Specify network
docker run --restart always       # Restart policy
          

Dockerfile Instructions

FROM node:18-alpine              # Base image
WORKDIR /app                     # Set working directory
COPY package*.json ./            # Copy files
RUN npm ci --only=production     # Execute command
COPY . .                         # Copy app source
ENV NODE_ENV=production          # Set environment var
EXPOSE 3000                      # Document port
USER node                        # Run as non-root user
CMD ["node", "server.js"]       # Default command
          

Docker Compose Example

version: '3.8'
services:
  web:
    build: .
    ports:
      - "3000:3000"
    environment:
      - DATABASE_URL=postgres://db:5432/mydb
    depends_on:
      - db
  db:
    image: postgres:15
    volumes:
      - pgdata:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=mydb
volumes:
  pgdata:
          

Compose Commands

docker compose upStart services
docker compose up -dDetached mode
docker compose downStop & remove
docker compose logsView logs
docker compose psList services
docker compose buildBuild images

System Commands

docker system dfDisk usage
docker system pruneCleanup all
docker infoSystem info
docker statsLive stats
docker inspectLow-level info