Some important docker commands

docker_commands

* sudo systemctl status docker [check whether docker is running]

* getent group docker [check whether we are the memeber of the group, if not then we need 
                        to add in the group to run docker commands]

* to add in docker group
    sudo usermod -aG docker ${USER}
    su - ${USER} 

* docker pull image_name [pull the image]

* docker run image_name [run a container from an image]

* docker run image_name:tag 

* docker run image_name command [run docker container with a command]

* docker run --name container_name image_name [run a named container from an image]

* docker run -d image_name [run container in backend i.e., dettached mode]

* docker run -v /full/local/path:/mounted/dir/in/container [mount data volume in docker]

* docker run -p host_port:container_port [port forwarding]

* docker attach container_name [attach to the container running in backend, works only for running containers]

* docker run --name container_name -it ubuntu [for running bash while creating the container]

* docker exec -it container_id/name bash [running bash in another terminal for a running ubuntu container, 
                                          works only for running containers]

* It's not possible to enter a stopped container, because the processes are gone, and therefore, the namespac-
  es are gone as well.

* docker start -ia container_id/name [to start a stoped container]

* docker stop container_id/name

* -i [flag i for interactive mode]

* -e [flag for env var]

* docker ps [list all running containers]

* docker ps -a [list all containers]

* docker inspect container_name/id [details of the container]

* docker logs container_name [all logs of the container]

* docker history image_name

* docker stop container_id/container_name

* docker rm container_id/container_name [delete container permanantely]

* docker images [list of available images on the host]

* docker rmi image_id/image_name [remove image, first delete all containers made from this image]

* docker exec container_name command [execute command on the container]

* docker volume ls [data dir, local docker volume]

* docker volume rm volume-name [remove volume only if container is removed]

* docker build -t image_name -f mpath/to/dockerfile . [build custom docker images]

* docker login --username=yourhubusername [login to dockerhub]

* docker tag image_name/id yourhubusername/image_name:version [give version to image]

* docker push yourhubusername/image_name:version [push your custom image to dockerhub]

* docker inspect container_name [return low-level info on docker objects]

* docker logs container_name