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A quick way to get started creating a juju charm using ansible.

Disclaimer: this template does not try to explain what's possible with either ansible or juju - but if you know a bit about both, it will show you how you can easily use them together.

Make sure you have both git and bzr installed and then:

$ mkdir -p charms/precise && cd charms/precise
$ git clone mycharm
$ cd mycharm
$ make

That will pull in the required charm-helpers library and run the unit-tests. Take a look around at the hooks/ or the playbooks/site.yaml, or deploy it with:

$ juju deploy --repository=../.. local:charm-bootstrap-ansible

If you'd like to explore what's happening when the hooks run, once juju status tells you that the services has 'started', you can open another terminal up and run

$ juju debug-hooks charm-bootstrap-ansible/0

Back in your original terminal, let's change one of the config options (defined in the config.yaml):

$ juju set charm-bootstrap-ansible string-option="Hi there"

Back in your debug-hooks terminal, you'll see the prompt has changed to let you know it's ready to run the config-changed hook. Run the hook to see what it does with:

$ hooks/config-changed

You'll see the output of ansible running all the tasks tagged with 'config-changed', including a debug message with the value of the config option that you changed. Just 'exit' to let juju know the hook execution has finished.

Have fun exploring the possibilities of ansible and juju!

Note about Dependencies

The makefile to run tests requires the following dependencies

  • python-nose
  • python-mock
  • python-flake8
  • python-yaml
  • bzr

installable via:

$ sudo apt-get install bzr python-yaml python-nose python-mock python-flake8