Beginning Adventures with Docker Module

[Joaquin Menchaca]

I created a vagrant environment to rapidly test code, and a custom inventory.py.  But alas, hosts: dockerexp.dev doesn't work, so screw it, hosts: all.

Now I have functional environment, time to do some docker stuff, try a simple docker_login: and find that it doesn't work.  What's this docker-py thingy? I have docker-py on my host development system.  From Ansible's marketing, I get that Ansible doesn't require any agent, it's simple, all that.  So, I am accustom that is a push tech.  Research later, find many others confused, find Ansible ticket, and most to their horror or chagrin, docker-py needs to be installed on the server.  WHAT?!?!? confused.

• http://stackoverflow.com/questions/38181433/ansible-cannot-import-docker-py-even-though-it-is-installed
• https://github.com/ansible/ansible-modules-core/issues/4246

Alright, install pip on Ubuntu.. WTF 26 package dependencies... No way... easy_install pip, pip install docker-py.  

Good to go, back to docker fun, ansible-playbook ...  

WTF... Minimum version is 1.7.0, which is greater than 1.10.0? or something, WTF... google, google, google.   

• Issue: https://github.com/ansible/ansible-modules-core/issues/4047
• PR: https://github.com/ansible/ansible-modules-core/pull/4048/commits

Apparently, there's been a bug there for a while, maybe it only showed up at 1.10.0.   Installed 1.7.0, works.  Installed 1.9.0, works.

Finally, now I can do docker... ansible-playbook.... FAIL..  Aaaaaah... but this time, it's my fault... fixed.

Ultimately, came up with these tasks for anywhere you want to use docker module, at least on Ubuntu:

  - name: Install easy_install
    apt: name=python-setuptools update_cache=yes
  - name: Install pip
    easy_install: name=pip state=latest
  - name: Install docker-py
    pip: name=docker-py version=1.9.0