Any changes to a running container is contained within and do not impact the image.
Any changes done to a container are not lost when a container is stopped. By default, docker ps does not show the stopped container.
View stopped container
$ docker ps -a (All stopped containers). The stopped container still exists and is not deleted. $ docker ps -l (Last container to exit)
docker run command converts an image into container. Similarly, you can convert a stopped container into an image. This is useful when you have a running container and you make some changes to the container. If you would like to distribute this as an image – docker commit is the command to use.
$ docker commit container ID is not the same as image id. This command creates the image but it does not have a name. We name the image with the tag command. $ docker tag
Above two commands can be clubbed into one:
$ docker commit
Remove stopped container
$ docker container rm
Remove an existing image
$ docker rmi
Running an image
# Spawn a container that will dosomething and exit as soon as the container is completed. It is accomplished by --rm option $ docker run --rm -ti sleep 5 # This will run the image, sleep for5seconds and exit the container. The container will get deleted as it finishes it's work (sleeping :))! #Exit container by pressing Ctrl + D or typing exit # Spawn a container that will run in detached mode docker run -d -ti bash
# Attaching to the container after running the container in detached mode docker attach
# Detaching from a container after attaching to it cannot be done with exit. Use a special key sequence Ctrl + P and Ctrl + Q to detach from the container. # Executing another process within the running container. Similar to attach docker exec -ti bash
# After executing another process, ifthe parent container exits. This child container will also automatically be exited.
Docker Flow
Listing all the docker images on the docker server
$ docker images$ docker run -tiView the running images (container) status
$ docker ps$ export FORMAT=\\nID\\t{{.ID}}\\nIMAGE\\t{{.Image}}\\nCOMMAND\\t{{.Command}}\\nCREATED\\t{{.RunningFor}}\\nSTATUS\\t{{.Status}}\\nPORTS\\t{{.Ports}}\\nNAMES\\t{{.Names}}\\n$ docker ps --format=$FORMATView stopped container
$ docker ps -a (All stopped containers). The stopped container still exists and is not deleted.$ docker ps -l (Last container to exit)$ docker commit container ID is not the same as image id. This command creates the image but it does not have a name. We name the image with the tag command.$ docker tag$ docker commitRemove stopped container
$ docker container rmRemove an existing image
$ docker rmiRunning an image
# Spawn a container that willdosomething and exit as soon as the container is completed. It is accomplished by --rm option$ docker run --rm -ti sleep5# This will run the image, sleepfor5seconds and exit the container. The container will get deleted as it finishes it's work (sleeping :))!#Exit container by pressing Ctrl + D or typing exit# Spawn a container that will run in detached modedocker run -d -ti bash# Attaching to the container after running the container in detached modedocker attach# Detaching from a container after attaching to it cannot be done with exit. Use a special key sequence Ctrl + P and Ctrl + Q to detach from the container.# Executing another process within the running container. Similar to attachdocker exec -ti bash# After executing another process,ifthe parent container exits. This child container will also automatically be exited.Archives
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