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 (xenial, 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:ubuntu16.04`
37 - `williamyeh/ansible:ubuntu14.04`
38 - `williamyeh/ansible:ubuntu12.04`
39 - `williamyeh/ansible:centos7`
40 - `williamyeh/ansible:centos6`
41 - `williamyeh/ansible:alpine3`
43 - Onbuild series (*recommended for common cases*):
45 - `williamyeh/ansible:debian8-onbuild`
46 - `williamyeh/ansible:debian7-onbuild`
47 - `williamyeh/ansible:ubuntu16.04-onbuild`
48 - `williamyeh/ansible:ubuntu14.04-onbuild`
49 - `williamyeh/ansible:ubuntu12.04-onbuild`
50 - `williamyeh/ansible:centos7-onbuild`
51 - `williamyeh/ansible:centos6-onbuild`
52 - `williamyeh/ansible:alpine3-onbuild`
58 - `williamyeh/ansible:1.9-debian8`
59 - `williamyeh/ansible:1.9-debian7`
60 - `williamyeh/ansible:1.9-ubuntu14.04`
61 - `williamyeh/ansible:1.9-ubuntu12.04`
62 - `williamyeh/ansible:1.9-centos7`
63 - `williamyeh/ansible:1.9-centos6`
64 - `williamyeh/ansible:1.9-alpine3`
66 - Onbuild series (*recommended for common cases*):
68 - `williamyeh/ansible:1.9-debian8-onbuild`
69 - `williamyeh/ansible:1.9-debian7-onbuild`
70 - `williamyeh/ansible:1.9-ubuntu14.04-onbuild`
71 - `williamyeh/ansible:1.9-ubuntu12.04-onbuild`
72 - `williamyeh/ansible:1.9-centos7-onbuild`
73 - `williamyeh/ansible:1.9-centos6-onbuild`
74 - `williamyeh/ansible:1.9-alpine3-onbuild`
76 ### Experimental version (building directly from the git `master` source tree; use at your own risk!):
80 - `williamyeh/ansible:master-debian8`
81 - `williamyeh/ansible:master-debian7`
82 - `williamyeh/ansible:master-ubuntu16.04`
83 - `williamyeh/ansible:master-ubuntu14.04`
84 - `williamyeh/ansible:master-ubuntu12.04`
85 - `williamyeh/ansible:master-centos7`
86 - `williamyeh/ansible:master-centos6`
88 - Onbuild series (*recommended for common cases*):
90 - `williamyeh/ansible:master-debian8-onbuild`
91 - `williamyeh/ansible:master-debian7-onbuild`
92 - `williamyeh/ansible:master-ubuntu16.04-onbuild`
93 - `williamyeh/ansible:master-ubuntu14.04-onbuild`
94 - `williamyeh/ansible:master-ubuntu12.04-onbuild`
95 - `williamyeh/ansible:master-centos7-onbuild`
96 - `williamyeh/ansible:master-centos6-onbuild`
102 Here comes a simplest working example for the impatient.
104 First, choose a base image you'd like to begin with. For example, `williamyeh/ansible:ubuntu14.04-onbuild`.
106 Second, put the following `Dockerfile` along with your playbook directory:
109 FROM williamyeh/ansible:ubuntu14.04-onbuild
111 # ==> Specify requirements filename; default = "requirements.yml"
112 #ENV REQUIREMENTS requirements.yml
114 # ==> Specify playbook filename; default = "playbook.yml"
115 #ENV PLAYBOOK playbook.yml
117 # ==> Specify inventory filename; default = "/etc/ansible/hosts"
118 #ENV INVENTORY inventory.ini
120 # ==> Executing Ansible (with a simple wrapper)...
121 RUN ansible-playbook-wrapper
124 Third, `docker build .`
128 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 on [CircleCI](https://circleci.com/)'s Ubuntu 12.04 and [Travis CI](https://travis-ci.org/)’s Ubuntu 14.04 worker instances.
133 ## Why yet another Ansible image for Docker?
135 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?
137 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:
139 - *Base OS image* - It provides only `centos:centos7` and `ubuntu:14.04`. Insufficent for me.
141 - *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.
143 Therefore, I built these Docker images on my own.
145 **NOTE:** [`ansible/ansible-docker-base`](https://github.com/ansible/ansible-docker-base) announced in September 2015: “Ansible no longer maintains images in Dockerhub directly.”
147 ### Comparison: image size
150 REPOSITORY TAG VIRTUAL SIZE
151 --------------------------- ------------------- ------------
152 ansible/centos7-ansible stable 367.5 MB
153 ansible/ubuntu14.04-ansible stable 286.6 MB
155 williamyeh/ansible alpine3-onbuild 66.4 MB
156 williamyeh/ansible centos6-onbuild 264.2 MB
157 williamyeh/ansible centos7-onbuild 275.3 MB
158 williamyeh/ansible debian7-onbuild 134.4 MB
159 williamyeh/ansible debian8-onbuild 178.3 MB
160 williamyeh/ansible ubuntu12.04-onbuild 181.9 MB
161 williamyeh/ansible ubuntu14.04-onbuild 238.3 MB
167 Used mostly as a *base image* for configuring other software stack on some specified Linux distribution(s).
169 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:
174 Vagrant.configure(2) do |config|
176 # ==> Choose a Vagrant box to emulate Linux distribution...
177 #config.vm.box = "ubuntu/xenial64"
178 config.vm.box = "ubuntu/trusty64"
179 #config.vm.box = "ubuntu/precise64"
180 #config.vm.box = "debian/jessie64"
181 #config.vm.box = "debian/wheezy64"
182 #config.vm.box = "bento/centos-7.2"
183 #config.vm.box = "bento/centos-6.7"
184 #config.vm.box = "maier/alpine-3.3.1-x86_64"
187 # ==> Executing Ansible...
188 config.vm.provision "ansible" do |ansible|
189 ansible.playbook = "playbook.yml"
195 Virtual machines can emulate a variety of Linux distributions with good quality, at the cost of runtime overhead.
198 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:
204 # ==> Choose a base image to emulate Linux distribution...
205 #FROM williamyeh/ansible:ubuntu16.04
206 FROM williamyeh/ansible:ubuntu14.04
207 #FROM williamyeh/ansible:ubuntu12.04
208 #FROM williamyeh/ansible:debian8
209 #FROM williamyeh/ansible:debian7
210 #FROM williamyeh/ansible:centos7
211 #FROM williamyeh/ansible:centos6
212 #FROM williamyeh/ansible:alpine3
215 # ==> Copying Ansible playbook...
219 # ==> Creating inventory file...
220 RUN echo localhost > inventory
222 # ==> Executing Ansible...
223 RUN ansible-playbook -i inventory playbook.yml \
224 --connection=local --sudo
227 You may also work with `onbuild` series, which take care of many routine steps for you:
232 # ==> Choose a base image to emulate Linux distribution...
233 #FROM williamyeh/ansible:ubuntu16.04-onbuild
234 FROM williamyeh/ansible:ubuntu14.04-onbuild
235 #FROM williamyeh/ansible:ubuntu12.04-onbuild
236 #FROM williamyeh/ansible:debian8-onbuild
237 #FROM williamyeh/ansible:debian7-onbuild
238 #FROM williamyeh/ansible:centos7-onbuild
239 #FROM williamyeh/ansible:centos6-onbuild
240 #FROM williamyeh/ansible:alpine3-onbuild
243 # ==> Specify requirements filename; default = "requirements.yml"
244 #ENV REQUIREMENTS requirements.yml
246 # ==> Specify playbook filename; default = "playbook.yml"
247 #ENV PLAYBOOK playbook.yml
249 # ==> Specify inventory filename; default = "/etc/ansible/hosts"
250 #ENV INVENTORY inventory.ini
252 # ==> Executing Ansible (with a simple wrapper)...
253 RUN ansible-playbook-wrapper
258 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!
260 If better OS emulation (virtualization) isn't required, the Docker approach (containerization) should give you a more efficient Ansible experience.
266 Author: William Yeh <william.pjyeh@gmail.com>
268 Licensed under the Apache License V2.0. See the [LICENSE file](LICENSE) for details.