This document provides tips and tricks for using Docker including how to view container processes and logs, check container stats, copy files between the host and container, fetch single values from Docker inspect, use Docker exec instead of SSH, and run a GUI application in a container by sharing the X11 socket.

1. Docker: Tips & Tricks
Dharmit Shah
@dharm1t

2. Who am I?
(Earlier)
@
@

3. Nice `docker ps` output
$ docker ps -a | less -S

4. Follow the logs
$ docker logs <containerid> -f

5. Stats for running container
$ docker stats <container-id> <container-id> … <container-id>

6. Copy files from host to container
$ docker cp /file/on/host <container-id>:/path/in/container

7. Fetch single value from docker
inspect
$ docker inspect --format '{{.State.Running}}' $(docker ps -lq)
$ docker inspect --format '{{.NetworkSettings.IPAddress}}' $(docker ps -lq)

8. docker exec instead of sshd or
nsenter
$ docker exec -it <container-id> /bin/bash

9. Old man staring at your mouse!
$ xhost local:root
$ docker run -d
-e DISPLAY=$DISPLAY
-v tmp/.X11-unix:/tmp/.X11-unix xeji

11. FROM debian:squeeze
RUN apt-get update &&
apt-get install -y xeji
RUN export uid=1000 gid=1000 &&
mkdir -p /home/developer &&
echo "developer:x:${uid}:${gid}:Developer,,,:/home/developer:/bin/bash" >>
/etc/passwd &&
echo "developer:x:${uid}:" >> /etc/group &&
echo "developer ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/developer &&
chmod 0440 /etc/sudoers.d/developer &&
chown ${uid}:${gid} -R /home/developer
USER developer
ENV HOME /home/developer
ENTRYPOINT ["/usr/bin/xeji"]