====== Docker on Debian ======

===== Prerequisites =====
  * Packages installed: debootstrap and friends.
  * I use Debian testing/jessie (now stable), and put sid into sources.list so I can apt-get install docker.io, because docker.io [[https://packages.qa.debian.org/d/docker.io/news/20150331T163915Z.html|removed from testing]] in late March 2015 and available only in sid.<code># vim /etc/apt/sources.list</code><code>deb http://yourrepo/debian/ sid main</code>
  * Update your packages list.<code># apt-get update</code>
  * Install docker.io with:<code># apt-get install docker.io</code>

===== Creating Minimal Base Docker Image =====

  * Use mkimage.sh to create Docker image.<code>$ sudo /usr/share/docker.io/contrib/mkimage.sh -t ${USER}/minbase debootstrap --variant=minbase --components=main --include=inetutils-ping,inetutils-traceroute,iproute jessie http://yourrepo/debian/</code>
  * Try to run 'echo':<code>$ sudo docker run -it ${USER}/minbase echo "hello citra"</code>or bash shell:<code>$ sudo docker run -it ${USER}/minbase /bin/bash</code>

===== Creating Custom Docker Image =====
  * Firstly, create a dockerfile for your container.<code>$ vim dockerfile</code><code>FROM stwn/minbase
MAINTAINER stwn@NOSPAMduniasemu.org

RUN apt-get update && apt-get install -y \
    apt-utils less sudo screen \
    openssh-server openssh-client \
    asterisk</code>
  * Build docker container based on the dockerfile.<code># docker build -t ${USER}/asterisk:test0 - < dockerfile</code>
===== Frequently Used Commands =====
  * Restart docker service with systemd:<code># systemctl restart docker.service</code>
  * Show images:<code># docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             VIRTUAL SIZE
stwn/minbase        latest              d816657c5182        3 minutes ago       123.7 MB
scratch             latest              511136ea3c5a        22 months ago       0 B</code>
  * Remove image:<code># docker rmi [IMAGE ID]</code>
  * Commit change:<code># docker commit [IMAGE ID] ${USER}/asterisk:test1</code>
  * Show all running containers:<code># docker ps -a</code>
  * Remove container:<code># docker rm [CONTAINER ID]</code>

===== Networking in Docker =====
There is a network interface named docker0 when we run Docker engine. This interface connected as a (virtual Ethernet) bridge to containers inside Docker and configured with private ip address/network.