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: four variants -
23 1. provides the most recent *stable* version of Ansible; suitable for most people.
24 2. this variant is designed for building *minimal* images out of playbooks; i.e., the Ansible body will be removed when mission completed.
25 3. provides the old 1.9 version of Ansible.
26 4. provides the *experimental* version of Ansible.
31 ### Stable version (installed from official PyPI repo):
35 - `williamyeh/ansible:debian8`
36 - `williamyeh/ansible:debian7`
37 - `williamyeh/ansible:ubuntu16.04`
38 - `williamyeh/ansible:ubuntu14.04`
39 - `williamyeh/ansible:ubuntu12.04`
40 - `williamyeh/ansible:centos7`
41 - `williamyeh/ansible:centos6`
42 - `williamyeh/ansible:alpine3`
44 - Onbuild series (*recommended for common cases*):
46 - `williamyeh/ansible:debian8-onbuild`
47 - `williamyeh/ansible:debian7-onbuild`
48 - `williamyeh/ansible:ubuntu16.04-onbuild`
49 - `williamyeh/ansible:ubuntu14.04-onbuild`
50 - `williamyeh/ansible:ubuntu12.04-onbuild`
51 - `williamyeh/ansible:centos7-onbuild`
52 - `williamyeh/ansible:centos6-onbuild`
53 - `williamyeh/ansible:alpine3-onbuild`
56 ### Minimal configuration (the Ansible body will be removed when mission completed):
60 - `williamyeh/ansible:mini-alpine3`
61 - `williamyeh/ansible:mini-debian8`
68 - `williamyeh/ansible:1.9-debian8`
69 - `williamyeh/ansible:1.9-debian7`
70 - `williamyeh/ansible:1.9-ubuntu14.04`
71 - `williamyeh/ansible:1.9-ubuntu12.04`
72 - `williamyeh/ansible:1.9-centos7`
73 - `williamyeh/ansible:1.9-centos6`
74 - `williamyeh/ansible:1.9-alpine3`
76 - Onbuild series (*recommended for common cases*):
78 - `williamyeh/ansible:1.9-debian8-onbuild`
79 - `williamyeh/ansible:1.9-debian7-onbuild`
80 - `williamyeh/ansible:1.9-ubuntu14.04-onbuild`
81 - `williamyeh/ansible:1.9-ubuntu12.04-onbuild`
82 - `williamyeh/ansible:1.9-centos7-onbuild`
83 - `williamyeh/ansible:1.9-centos6-onbuild`
84 - `williamyeh/ansible:1.9-alpine3-onbuild`
87 ### Experimental version (building directly from the git `master` source tree; use at your own risk!):
91 - `williamyeh/ansible:master-debian8`
92 - `williamyeh/ansible:master-debian7`
93 - `williamyeh/ansible:master-ubuntu16.04`
94 - `williamyeh/ansible:master-ubuntu14.04`
95 - `williamyeh/ansible:master-ubuntu12.04`
96 - `williamyeh/ansible:master-centos7`
97 - `williamyeh/ansible:master-centos6`
99 - Onbuild series (*recommended for common cases*):
101 - `williamyeh/ansible:master-debian8-onbuild`
102 - `williamyeh/ansible:master-debian7-onbuild`
103 - `williamyeh/ansible:master-ubuntu16.04-onbuild`
104 - `williamyeh/ansible:master-ubuntu14.04-onbuild`
105 - `williamyeh/ansible:master-ubuntu12.04-onbuild`
106 - `williamyeh/ansible:master-centos7-onbuild`
107 - `williamyeh/ansible:master-centos6-onbuild`
113 Here comes a simplest working example for the impatient.
115 First, choose a base image you'd like to begin with. For example, `williamyeh/ansible:ubuntu14.04-onbuild`.
117 Second, put the following `Dockerfile` along with your playbook directory:
120 FROM williamyeh/ansible:ubuntu14.04-onbuild
122 # ==> Specify requirements filename; default = "requirements.yml"
123 #ENV REQUIREMENTS requirements.yml
125 # ==> Specify playbook filename; default = "playbook.yml"
126 #ENV PLAYBOOK playbook.yml
128 # ==> Specify inventory filename; default = "/etc/ansible/hosts"
129 #ENV INVENTORY inventory.ini
131 # ==> Executing Ansible (with a simple wrapper)...
132 RUN ansible-playbook-wrapper
135 Third, `docker build .`
139 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.
144 ## Why yet another Ansible image for Docker?
146 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?
148 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:
150 - *Base OS image* - It provides only `centos:centos7` and `ubuntu:14.04`. Insufficent for me.
152 - *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.
154 Therefore, I built these Docker images on my own.
156 **NOTE:** [`ansible/ansible-docker-base`](https://github.com/ansible/ansible-docker-base) announced in September 2015: “Ansible no longer maintains images in Dockerhub directly.”
158 ### Comparison: image size
161 REPOSITORY TAG VIRTUAL SIZE
162 --------------------------- ------------------- ------------
163 ansible/centos7-ansible stable 367.5 MB
164 ansible/ubuntu14.04-ansible stable 286.6 MB
166 williamyeh/ansible alpine3-onbuild 66.4 MB
167 williamyeh/ansible centos6-onbuild 264.2 MB
168 williamyeh/ansible centos7-onbuild 275.3 MB
169 williamyeh/ansible debian7-onbuild 134.4 MB
170 williamyeh/ansible debian8-onbuild 178.3 MB
171 williamyeh/ansible ubuntu12.04-onbuild 181.9 MB
172 williamyeh/ansible ubuntu14.04-onbuild 238.3 MB
178 Used mostly as a *base image* for configuring other software stack on some specified Linux distribution(s).
180 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:
185 Vagrant.configure(2) do |config|
187 # ==> Choose a Vagrant box to emulate Linux distribution...
188 #config.vm.box = "ubuntu/xenial64"
189 config.vm.box = "ubuntu/trusty64"
190 #config.vm.box = "ubuntu/precise64"
191 #config.vm.box = "debian/jessie64"
192 #config.vm.box = "debian/wheezy64"
193 #config.vm.box = "bento/centos-7.2"
194 #config.vm.box = "bento/centos-6.7"
195 #config.vm.box = "maier/alpine-3.3.1-x86_64"
198 # ==> Executing Ansible...
199 config.vm.provision "ansible" do |ansible|
200 ansible.playbook = "playbook.yml"
206 Virtual machines can emulate a variety of Linux distributions with good quality, at the cost of runtime overhead.
209 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:
215 # ==> Choose a base image to emulate Linux distribution...
216 #FROM williamyeh/ansible:ubuntu16.04
217 FROM williamyeh/ansible:ubuntu14.04
218 #FROM williamyeh/ansible:ubuntu12.04
219 #FROM williamyeh/ansible:debian8
220 #FROM williamyeh/ansible:debian7
221 #FROM williamyeh/ansible:centos7
222 #FROM williamyeh/ansible:centos6
223 #FROM williamyeh/ansible:alpine3
226 # ==> Copying Ansible playbook...
230 # ==> Creating inventory file...
231 RUN echo localhost > inventory
233 # ==> Executing Ansible...
234 RUN ansible-playbook -i inventory playbook.yml \
235 --connection=local --sudo
238 You may also work with `onbuild` series, which take care of many routine steps for you:
243 # ==> Choose a base image to emulate Linux distribution...
244 #FROM williamyeh/ansible:ubuntu16.04-onbuild
245 FROM williamyeh/ansible:ubuntu14.04-onbuild
246 #FROM williamyeh/ansible:ubuntu12.04-onbuild
247 #FROM williamyeh/ansible:debian8-onbuild
248 #FROM williamyeh/ansible:debian7-onbuild
249 #FROM williamyeh/ansible:centos7-onbuild
250 #FROM williamyeh/ansible:centos6-onbuild
251 #FROM williamyeh/ansible:alpine3-onbuild
254 # ==> Specify requirements filename; default = "requirements.yml"
255 #ENV REQUIREMENTS requirements.yml
257 # ==> Specify playbook filename; default = "playbook.yml"
258 #ENV PLAYBOOK playbook.yml
260 # ==> Specify inventory filename; default = "/etc/ansible/hosts"
261 #ENV INVENTORY inventory.ini
263 # ==> Executing Ansible (with a simple wrapper)...
264 RUN ansible-playbook-wrapper
269 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!
271 If better OS emulation (virtualization) isn't required, the Docker approach (containerization) should give you a more efficient Ansible experience.
277 Author: William Yeh <william.pjyeh@gmail.com>
279 Licensed under the Apache License V2.0. See the [LICENSE file](LICENSE) for details.