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Docker Environment Variables

Environment Varialbes​

  • color = os.environ.get('APP_COLOR')

  • export APP_COLOR=buld; python app.py

  • docker run -e APP_COLOR=blue app-name

  • docker run -e APP_COLOR=black app-name

  • docker run -e APP_COLOR=red app-name

inspect environment varialbe​

  • docker inspect container-name

Docker commnad​

  • docker run nigix
    start a container

  • docker ps
    list current running containers

  • docker ps -a
    list all containers

  • docker stop container_name
    stop a container

  • docker rm container_name
    remove a container

  • docker images
    list all images

  • docker rmi image_name
    remove a image (image should not running for a container)

  • docker pull image
    only pull the image, not runing

Docker Append a commnad​

  • docker run ubuntu sleep 5
    sleep is append command

  • docker exec container_name cat /etc/hosts
    append a command into a running container

Run - attach and detach​

  • docker run -d container_name/app_name
    will run container in background

  • docker attach container_id(a043d)
    will attach back the container

Run -tag​

  • docker run redis:4.0
    :4.0 is a version tag for redis

Run STDIN​

  • docker run -i container_name/app_name

  • docker run -it container_name/app_name

Run PORT mapping​

  • docker run -p 80:5000 container_name/webapp

RUN Volume mapping​

  • docker run -v /opt/datadir:/var/lib/mysql mysql

Container logs​

  • docker logs container_name