1 Docker-Ansible base images
4 [![Circle CI](https://circleci.com/gh/William-Yeh/docker-ansible.svg?style=shield)](https://circleci.com/gh/William-Yeh/docker-ansible) [![Build Status](https://travis-ci.org/William-Yeh/docker-ansible.svg?branch=master)](https://travis-ci.org/William-Yeh/docker-ansible)
9 Repository name in Docker Hub: **[williamyeh/ansible](https://registry.hub.docker.com/u/williamyeh/ansible/)**
11 This repository contains Dockerized [Ansible](https://github.com/ansible/ansible), published to the public [Docker Hub](https://registry.hub.docker.com/) via **automated build** mechanism.
17 These are Docker images for [Ansible](https://github.com/ansible/ansible) software, installed in a selected Linux distributions.
19 - OS: Debian (jessie, wheezy), Ubuntu (trusty, precise), CentOS (7, 6)
21 - Ansible: usually the latest version.
28 - `williamyeh/ansible:debian8`
29 - `williamyeh/ansible:debian7`
30 - `williamyeh/ansible:ubuntu14.04`
31 - `williamyeh/ansible:ubuntu12.04`
32 - `williamyeh/ansible:centos7`
33 - `williamyeh/ansible:centos6`
37 - `williamyeh/ansible:debian8-onbuild`
38 - `williamyeh/ansible:debian7-onbuild`
39 - `williamyeh/ansible:ubuntu14.04-onbuild`
40 - `williamyeh/ansible:ubuntu12.04-onbuild`
41 - `williamyeh/ansible:centos7-onbuild`
42 - `williamyeh/ansible:centos6-onbuild`
47 Here comes a simplest working example for the impatient.
49 First, choose a base image you'd like to begin with. For example, `williamyeh/ansible:ubuntu14.04-onbuild`.
51 Second, put the following `Dockerfile` along with your playbook directory:
54 FROM williamyeh/ansible:ubuntu14.04-onbuild
56 # ==> Specify requirements filename; default = "requirements.yml"
57 #ENV REQUIREMENTS requirements.yml
59 # ==> Specify playbook filename; default = "playbook.yml"
60 #ENV PLAYBOOK playbook.yml
62 # ==> Specify inventory filename; default = "/etc/ansible/hosts"
63 #ENV INVENTORY inventory.ini
65 # ==> Executing Ansible...
66 RUN ansible-playbook-wrapper
69 Third, `docker build .`
73 For more advanced usage, the role in Ansible Galaxy [`williamyeh/nginx`](https://galaxy.ansible.com/list#/roles/2245) also demonstrates how to do a simple integration test for a variety of Linux distributions on [CircleCI](https://circleci.com/)'s and [Travis CI](https://travis-ci.org/)’s Ubuntu 12.04 worker instances.
78 ## Why yet another Ansible image for Docker?
80 There has been quite a few Ansible images for Docker (e.g., [search](https://registry.hub.docker.com/search?q=ansible) in the Docker Hub), so why reinvent the wheel?
82 In the beginning I used the [`ansible/ansible-docker-base`](https://github.com/ansible/ansible-docker-base) created by Ansible Inc. It worked well, but left some room for improvement:
84 - *Base OS image* - It provides only `centos:centos7` and `ubuntu:14.04`. Insufficent for me.
86 - *Unnecessary dependencies* - It installed, at the very beginning of its Dockerfile, the `software-properties-common` package, which in turns installed some Python packages. I prefered to incorporate these stuff only when absolutely needed.
88 Therefore, I built these Docker images on my own.
91 ### Comparison: image size
94 REPOSITORY TAG VIRTUAL SIZE
95 --------------------------- ------------------- ------------
96 ansible/centos7-ansible stable 367.5 MB
97 ansible/ubuntu14.04-ansible stable 286.6 MB
99 williamyeh/ansible centos6-onbuild 264.2 MB
100 williamyeh/ansible centos7-onbuild 275.3 MB
101 williamyeh/ansible debian7-onbuild 134.4 MB
102 williamyeh/ansible debian8-onbuild 178.3 MB
103 williamyeh/ansible ubuntu12.04-onbuild 181.9 MB
104 williamyeh/ansible ubuntu14.04-onbuild 238.3 MB
110 Used mostly as a *base image* for configuring, with Ansible, other software stack on some specified Linux distribution.
112 Take Debian/Ubuntu/CentOS for example. To test an Ansible `playbook.yml` against a variety of Linux distributions, we may use [Vagrant](https://www.vagrantup.com/) as follows:
117 Vagrant.configure(2) do |config|
119 # ==> Choose a Vagrant box to emulate Linux distribution...
120 config.vm.box = "ubuntu/trusty64"
121 #config.vm.box = "hashicorp/precise64"
122 #config.vm.box = "chef/debian-7.8"
123 #config.vm.box = "chef/centos-7.0"
124 #config.vm.box = "chef/centos-6.6"
127 # ==> Executing Ansible...
128 config.vm.provision "ansible" do |ansible|
129 ansible.playbook = "playbook.yml"
135 Virtual machines can emulate a variety of Linux distributions with good quality, at the cost of runtime overhead.
138 Docker to be a rescue. Now, with these **williamyeh/ansible** series, we may test an Ansible `playbook.yml` against a variety of Linux distributions as follows:
144 # ==> Choose a base image to emulate Linux distribution...
145 FROM williamyeh/ansible:ubuntu14.04
146 #FROM williamyeh/ansible:ubuntu12.04
147 #FROM williamyeh/ansible:debian8
148 #FROM williamyeh/ansible:debian7
149 #FROM williamyeh/ansible:centos7
150 #FROM williamyeh/ansible:centos6
153 # ==> Copying Ansible playbook...
157 # ==> Creating inventory file...
158 RUN echo localhost > inventory
160 # ==> Executing Ansible...
161 RUN ansible-playbook -i inventory playbook.yml \
162 --connection=local --sudo
165 Or, more simple with `onbuild` series:
170 # ==> Choose a base image to emulate Linux distribution...
171 FROM williamyeh/ansible:ubuntu14.04-onbuild
172 #FROM williamyeh/ansible:ubuntu12.04-onbuild
173 #FROM williamyeh/ansible:debian8-onbuild
174 #FROM williamyeh/ansible:debian7-onbuild
175 #FROM williamyeh/ansible:centos7-onbuild
176 #FROM williamyeh/ansible:centos6-onbuild
179 # ==> Specify requirements filename; default = "requirements.yml"
180 #ENV REQUIREMENTS requirements.yml
182 # ==> Specify playbook filename; default = "playbook.yml"
183 #ENV PLAYBOOK playbook.yml
185 # ==> Specify inventory filename; default = "/etc/ansible/hosts"
186 #ENV INVENTORY inventory.ini
188 # ==> Executing Ansible...
189 RUN ansible-playbook-wrapper
194 With Docker, we can test any Ansible playbook against any version of any Linux distribution without the help of Vagrant. More lightweight, and more portable across IaaS, PaaS, and even CaaS (Container as a Service) providers!
196 If better OS emulation (virtualization) isn't required, the Docker approach (containerization) should give you a more efficient Ansible experience.
202 Author: William Yeh <william.pjyeh@gmail.com>
204 Licensed under the Apache License V2.0. See the [LICENSE file](LICENSE) for details.