Docker

Image vs Container

• container is a running env for image
  • it provides:
    • application image
      • postgres, redis
    • file system (virtual)
    • env configs
  • it has port to connect to the application that runs inside the container
    • for example: 5000

Basic commands

docker pull

1

docker pull <image>

• it pulls an image from the registry (by default: Docker Hub)

docker images

1

docker images

• returns list of downloaded/available images on your machine

docker run

1

docker run <image>

• it runs/start the image in the container

flags

• “-d” –> runs the image in the container in detached mode (smth like as a daemon), it also returns an id of started container

docker ps

1

docker ps

• returns list of all running containers
• the list contains ids of running containers
  • these ids could be used in other commands like docker stop <id> or docker start <id>

flags

• “-a” –> returns list of running and stopped containers

docker stop

1

docker stop <container_id>

• stops the container with id = <container_id>

docker start

1

docker start <container_id>

• start the container with id = <container_id>