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Docker containers

Identifiying containers

A Container is identified by an id that looks like ada3b521615d. Additionally, a container is given a random(?) name like adoring_babbage or nifty_cray.

Status of containers

The possible states of containers are

Exporting a container's file system

The file system of a container can be exported to a tar archive with docker export.

Removing old Docker containers

$ docker rm $(docker ps -q -f status=exited)

$ docker rm $(docker ps --no-trunc -aq)
With Docker 1.13.x: 
$ docker container prune

Detaching and attaching again

$ docker run -it --name foo debian bash
root@aa4a579e2648:/# var=hello
<ctrl-p> <ctrl-q>
Container is detached.
Attach again: 
$docker attach foo
root@aa4a579e2648:/# echo $var

See also

docker run creates a container and runs a command in it.
docker ps lists containers.

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