Ansible Dynamic Inventory OpenStack

The dynamic_inventory_openstack.py file will allow you to dynamically populate an Ansible inventory file using metadata tags on OpenStack instances.

Before using this dynamic inventory file, you will need to modify the 'regions' variable on line 36 to reflect the region(s) that you are targeting in your OpenStack setup.

Host Groups

To set host groups you can add the 'ansible_host_groups' metadata tag to the openstack instances that you would like to target:

$ nova meta <serevr-id> set "ansible_host_groups=<ansible-group-name>" 

You can set multiple host groups using a comma to separate groups:

$ nova meta <serevr-id> set "ansible_host_groups=<ansible-group-name1>,<ansible-group-name2>,<ansible-group-name3>" 

Host Variables

To set host variables add a metadata tag for 'ansible_host_vars' to your instances:

$ nova meta <serevr-id> set "ansible_host_vars=<key>:<value>" 

You can set multiple host groups using a comma to separate groups:

$ nova meta <serevr-id> set "ansible_host_vars=<key1>:<value1>,<key2>:<value2>,<key3>:<value3>" 

To ensure that your instances are being picked up by the dynamic inventory file you can simply run the python script and examine the output:

$ source <your-openstack-rc-file>.sh
$ python dynamic_inventory_openstack.py

You can then use the dynamic inventory file with the 'ansible-playbook' commad using a '-i' flag.