List all containers:
docker ps -a`</pre>
Remover all stopped containers:
<pre style="background-color: #eeeeee; border: 0px; color: #222426; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, sans-serif; font-size: 13px; margin-bottom: 1em; max-height: 600px; overflow: auto; padding: 5px; width: auto; word-wrap: normal;">`docker rm `docker ps -aq`
docker-machine ls
To Prevent the virtualbox machine use many memory
VBoxManage controlvm default poweroff
after stop the docker