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       #Post#: 28--------------------------------------------------
       Docker basic commands
       By: sravan Date: October 26, 2017, 5:43 am
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       [attach=1]
       Note : if you are a root user, then the cursor will be "#".
       In Other words if cursor is "#", then the user is root user
       If it is "$", it is non root user.
       If you are non root user, then you have to use "sudo" infront of
       every docker command.
       1. sudo docker ps
       ps : processess snapshot
       2. sudo docker ps -a
       a = all
       3. sudo docker images
       4. sudo docker rmi {imageName}
       rmi = remove image
       5. sudo docker rm {conatainer id/names}
       rm = remove
       6. sudo docker pull  ubuntu
       Pull = will check locally. If it did not find, then pull pulls
       image from dockerhub
       7. sudo docker run -d ubuntu sleep 20
       -d = (detached mode) run the command in background
       8. sudo docker run -ti ubuntu bash
       -ti = is most useful for the docker exec command.
       -i - interactive - connects STDIN to the allocated terminal. Any
       command you enter after this via your keyboard goes into the
       terminal
       8. sudo docker exec -ti CONTAINER bash
       exec = executes a command on a running container
       you can enter any running docker container by running
       9. cat /etc/*release*
       you can use the above command once you are in any container
       10. docker attach {name}
       when you used docker run -d ... the console is detached of
       current console (console running in backgroud of that
       container).
       if you want to attach or bring that in foreground , then you
       have to use docker attach {name}
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