add a little info about ghosts
Docker-DCO-1.1-Signed-off-by: Sven Dowideit (github: SvenDowideit)
@@ -858,6 +858,9 @@ Running ``docker ps`` showing 2 linked containers.
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
4c01db0b339c ubuntu:12.04 bash 17 seconds ago Up 16 seconds webapp
d7886598dbe2 crosbymichael/redis:latest /redis-server --dir 33 minutes ago Up 33 minutes 6379/tcp redis,webapp/db
+ fd2645e2e2b5 busybox:latest top 10 days ago Ghost insane_ptolemy
+
+The last container is marked as a ``Ghost`` container. It is a container that was running when the docker daemon was restarted (upgraded, or ``-H`` settings changed). The container is still running, but as this docker daemon process is not able to manage it, you can't attach to it. To bring them out of ``Ghost`` Status, you need to use ``docker kill`` or ``docker restart``.
.. _cli_pull:
