Dockerhost

Ansible role to set up a Raspberry Pi 2 as a Docker host running on CentOS 7.

Requirements

A Raspberry Pi 2 (the one with 1GB RAM), and the latest CentOS 7 image for the Raspberry Pi 2, available from

http://mirror.centos.org/altarch/7/isos/armhfp/

(e.g. CentOS-Userland-7-armv7hl-Minimal-1511-RaspberryPi2.img.xz)

This compressed image needs to be extracted and written to an empty SD card (all existing data will be overwritten!), e.g. with

xz -cd <path-to-directory-containing-the-image>/CentOS-Userland-7-armv7hl-Minimal-1511-RaspberryPi2.img.xz | dd of=/dev/mmcblk0 bs=4M

if /dev/mmcblk0 is the SD card device; make sure to have umounted all partitions on the SD card!

Place the SD card into the Raspberry Pi 2, make sure a keyboard is connected, a network cable and a screen as well, and power it up. After the initial boot, login with

rpi2 login: root
Password: centos

Run

ip add sh eth0

and note the IP address next to the line beginning with "inet".

Copy your SSH key to the Raspberry using this IP address

ssh-copy-id root@<ipaddress>

you may need to remove the line beginning with this IP address in ~/.ssh/known_hosts in case you already have ssh'ed to this IP address before.

Role Variables

None right now.

Dependencies

None right now.

Example Playbook

- name: Deploy a docker host
  hosts: dockerhosts
  remote_user: root

  roles:
    - dockerhost

with an inventory file like this for example:

[dockerhosts]
dockerhost ansible_ssh_host=<above-ip-address> ansible_ssh_user=root

License

GPLv3

Author Information

Joachim Schröder, jos (at) redhat.com