Docker - Basic Commands / Cheatsheet

0-Snippets.md

Docker Snippets

MongoDB

• Running: docker run -d -p 27017-27019:27017-27019 --name mongodb mongo:4.0.4
• Bash: docker exec -it mongodb bash

MySQL

• Running: docker run -d -e MYSQL_ALLOW_EMPTY_PASSWORD=true -p 3306:3306 -v ~/Projects/Docker/mysql:/var/lib/mysql --name mysql mysql:5.7
• Bash: docker exec -it mysql bash

Memcached

• Running: docker run -d -p 11211:11211 --name memcached memcached -m 64
• Bash: docker exec -it memcached bash

docker-compose.yml

version: '3'
services:
  app:
    build:
      context: ./docker/app
      dockerfile: Dockerfile
    image: shippingdocker/app:latest
    networks:
     - appnet
    volumes:
     - ./application:/var/www/html
     working_dir: /var/www/html
  cache:
    image: redis:alpine
    networks:
     - appnet
    volumes:
     - cachedata:/data
  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: secret
      MYSQL_DATABASE: homestead
      MYSQL_USER: homestead
      MYSQL_PASSWORD: secret
    networks:
     - appnet
    volumes:
     - dbdata:/var/lib/mysql
networks:
  appnet:
    driver: bridge
volumes:
  dbdata:
    driver: local
  cachedata:
    driver: local

DockerBasicCommands.md

Docker - Basic Commands / Cheatsheet

• docker run --rm -it -p 8080:80 ubuntu:latest bash

  • -v local:remote - Map a remote folder
  • -p 8080:80 - Map ports
  • --rm - Remove container after finish
  • -d - Run container in background
  • -it - Run container in interactive mode
  • --name=app - Set a name (hostname) to a container
  • ubuntu:latest - Image name to use
  • bash - Pass a command to the container

• docker search nginx - Search an image

• docker image ls - List local images

• docker ps - List local running containers

• docker ps -a - List all local containers

• docker exec -it <container-id> <command> - Execute a command in a container with -it iteractive mode

• docker exec -d <container-id> <command> - Execute a command in a container with -d background mode

• docker build -t namespace/image:version -f Dockerfile . - Build an image, with the -t name, using -f Dockerfile and using . folder as base folder

• docker diff <container-id> - Show diff between image and actual container

• docker commit -a "John Doe" -m "App installed" <container-id> image:version

• docker stop <container-id> - Stops a container

• docker logs -f <container-id> - Show container logs, -f to follow log updates realtime

Networking

• docker network ls - List networks
• docker network create <network-name> - Create a new network
• docker network inspect <network-name> - Inspect a given network
• docker run -d --rm --network=<network-name> mysql:5.7 - Run container with specified network

Volumes

• docker volume ls - List volumes
• docker volume create <volume-name> - Create a new volume
• docker run -d --rm -v <volume-name>:/var/www/volume ubuntu:latest - Run container with attached container

Docker Composer

• docker-compose up -d - Run a container from a folder with docker-compose.yml file
• docker-compose down -d - Kill a container
• docker-compose exec <container> php artisan migrate - Execute a command inside a container

Tips

• Run processes without daemon, to supervisord and docker track processes states
• Docker Composer can read variables from .env files and use inside the yml with ${VARIABLE}

Source

• https://serversforhackers.com/t/containers

Dockerfile

FROM ubuntu:18.04

LABEL maintainer="John Doe"

ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update 

ADD default /etc/nginx/sites-available/default

CMD ["supervisord"]

ENTRYPOINT ["start-container.sh"]