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), Alpine (3).
21 - Ansible: three version series -
23 1. the most recent *stable* version;
25 3. the *experimental* version.
30 ### Stable version (installed from official PyPI repo):
34 - `williamyeh/ansible:debian8`
35 - `williamyeh/ansible:debian7`
36 - `williamyeh/ansible:ubuntu14.04`
37 - `williamyeh/ansible:ubuntu12.04`
38 - `williamyeh/ansible:centos7`
39 - `williamyeh/ansible:centos6`
40 - `williamyeh/ansible:alpine3`
42 - Onbuild series (*recommended for common cases*):
44 - `williamyeh/ansible:debian8-onbuild`
45 - `williamyeh/ansible:debian7-onbuild`
46 - `williamyeh/ansible:ubuntu14.04-onbuild`
47 - `williamyeh/ansible:ubuntu12.04-onbuild`
48 - `williamyeh/ansible:centos7-onbuild`
49 - `williamyeh/ansible:centos6-onbuild`
50 - `williamyeh/ansible:alpine3-onbuild`
56 - `williamyeh/ansible:1.9-debian8`
57 - `williamyeh/ansible:1.9-debian7`
58 - `williamyeh/ansible:1.9-ubuntu14.04`
59 - `williamyeh/ansible:1.9-ubuntu12.04`
60 - `williamyeh/ansible:1.9-centos7`
61 - `williamyeh/ansible:1.9-centos6`
62 - `williamyeh/ansible:1.9-alpine3`
64 - Onbuild series (*recommended for common cases*):
66 - `williamyeh/ansible:1.9-debian8-onbuild`
67 - `williamyeh/ansible:1.9-debian7-onbuild`
68 - `williamyeh/ansible:1.9-ubuntu14.04-onbuild`
69 - `williamyeh/ansible:1.9-ubuntu12.04-onbuild`
70 - `williamyeh/ansible:1.9-centos7-onbuild`
71 - `williamyeh/ansible:1.9-centos6-onbuild`
72 - `williamyeh/ansible:1.9-alpine3-onbuild`
74 ### Experimental version (building directly from the git `master` source tree; use at your own risk!):
78 - `williamyeh/ansible:master-debian8`
79 - `williamyeh/ansible:master-debian7`
80 - `williamyeh/ansible:master-ubuntu14.04`
81 - `williamyeh/ansible:master-ubuntu12.04`
82 - `williamyeh/ansible:master-centos7`
83 - `williamyeh/ansible:master-centos6`
85 - Onbuild series (*recommended for common cases*):
87 - `williamyeh/ansible:master-debian8-onbuild`
88 - `williamyeh/ansible:master-debian7-onbuild`
89 - `williamyeh/ansible:master-ubuntu14.04-onbuild`
90 - `williamyeh/ansible:master-ubuntu12.04-onbuild`
91 - `williamyeh/ansible:master-centos7-onbuild`
92 - `williamyeh/ansible:master-centos6-onbuild`
98 Here comes a simplest working example for the impatient.
100 First, choose a base image you'd like to begin with. For example, `williamyeh/ansible:ubuntu14.04-onbuild`.
102 Second, put the following `Dockerfile` along with your playbook directory:
105 FROM williamyeh/ansible:ubuntu14.04-onbuild
107 # ==> Specify requirements filename; default = "requirements.yml"
108 #ENV REQUIREMENTS requirements.yml
110 # ==> Specify playbook filename; default = "playbook.yml"
111 #ENV PLAYBOOK playbook.yml
113 # ==> Specify inventory filename; default = "/etc/ansible/hosts"
114 #ENV INVENTORY inventory.ini
116 # ==> Executing Ansible (with a simple wrapper)...
117 RUN ansible-playbook-wrapper
120 Third, `docker build .`
124 For more advanced usage, the role in Ansible Galaxy [`williamyeh/nginx`](https://galaxy.ansible.com/williamyeh/nginx/) demonstrates how to perform a simple smoke test (*configuration needs test, too!*) on a variety of (*containerized*) Linux distributions via [CircleCI](https://circleci.com/)'s Ubuntu 12.04 and [Travis CI](https://travis-ci.org/)’s Ubuntu 14.04 worker instances.
129 ## Why yet another Ansible image for Docker?
131 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?
133 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:
135 - *Base OS image* - It provides only `centos:centos7` and `ubuntu:14.04`. Insufficent for me.
137 - *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.
139 Therefore, I built these Docker images on my own.
141 **NOTE:** [`ansible/ansible-docker-base`](https://github.com/ansible/ansible-docker-base) announced in September 2015: “Ansible no longer maintains images in Dockerhub directly.”
143 ### Comparison: image size
146 REPOSITORY TAG VIRTUAL SIZE
147 --------------------------- ------------------- ------------
148 ansible/centos7-ansible stable 367.5 MB
149 ansible/ubuntu14.04-ansible stable 286.6 MB
151 williamyeh/ansible alpine3-onbuild 66.4 MB
152 williamyeh/ansible centos6-onbuild 264.2 MB
153 williamyeh/ansible centos7-onbuild 275.3 MB
154 williamyeh/ansible debian7-onbuild 134.4 MB
155 williamyeh/ansible debian8-onbuild 178.3 MB
156 williamyeh/ansible ubuntu12.04-onbuild 181.9 MB
157 williamyeh/ansible ubuntu14.04-onbuild 238.3 MB
163 Used mostly as a *base image* for configuring other software stack on some specified Linux distribution(s).
165 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:
170 Vagrant.configure(2) do |config|
172 # ==> Choose a Vagrant box to emulate Linux distribution...
173 config.vm.box = "ubuntu/trusty64"
174 #config.vm.box = "ubuntu/precise64"
175 #config.vm.box = "debian/jessie64"
176 #config.vm.box = "debian/wheezy64"
177 #config.vm.box = "bento/centos-7.2"
178 #config.vm.box = "bento/centos-6.7"
179 #config.vm.box = "maier/alpine-3.3.1-x86_64"
182 # ==> Executing Ansible...
183 config.vm.provision "ansible" do |ansible|
184 ansible.playbook = "playbook.yml"
190 Virtual machines can emulate a variety of Linux distributions with good quality, at the cost of runtime overhead.
193 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:
199 # ==> Choose a base image to emulate Linux distribution...
200 FROM williamyeh/ansible:ubuntu14.04
201 #FROM williamyeh/ansible:ubuntu12.04
202 #FROM williamyeh/ansible:debian8
203 #FROM williamyeh/ansible:debian7
204 #FROM williamyeh/ansible:centos7
205 #FROM williamyeh/ansible:centos6
206 #FROM williamyeh/ansible:alpine3
209 # ==> Copying Ansible playbook...
213 # ==> Creating inventory file...
214 RUN echo localhost > inventory
216 # ==> Executing Ansible...
217 RUN ansible-playbook -i inventory playbook.yml \
218 --connection=local --sudo
221 You may also work with `onbuild` series, which take care of many routine steps for you:
226 # ==> Choose a base image to emulate Linux distribution...
227 FROM williamyeh/ansible:ubuntu14.04-onbuild
228 #FROM williamyeh/ansible:ubuntu12.04-onbuild
229 #FROM williamyeh/ansible:debian8-onbuild
230 #FROM williamyeh/ansible:debian7-onbuild
231 #FROM williamyeh/ansible:centos7-onbuild
232 #FROM williamyeh/ansible:centos6-onbuild
233 #FROM williamyeh/ansible:alpine3-onbuild
236 # ==> Specify requirements filename; default = "requirements.yml"
237 #ENV REQUIREMENTS requirements.yml
239 # ==> Specify playbook filename; default = "playbook.yml"
240 #ENV PLAYBOOK playbook.yml
242 # ==> Specify inventory filename; default = "/etc/ansible/hosts"
243 #ENV INVENTORY inventory.ini
245 # ==> Executing Ansible (with a simple wrapper)...
246 RUN ansible-playbook-wrapper
251 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!
253 If better OS emulation (virtualization) isn't required, the Docker approach (containerization) should give you a more efficient Ansible experience.
259 Author: William Yeh <william.pjyeh@gmail.com>
261 Licensed under the Apache License V2.0. See the [LICENSE file](LICENSE) for details.