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Inventory and variables
Our dynamic Inventory
OpenStack-Ansible ships with its own dynamic inventory. You can find more explanations on the inventory.
Variable precedence
Role defaults
Every role has a file, defaults/main.yml which holds the
usual variables overridable by a deployer, like a regular Ansible role.
This defaults are the closest possible to OpenStack standards.
Group vars and host vars
OpenStack-Ansible provides safe defaults for deployers in its group_vars folder. They take care of the wiring between different roles, like for example storing information on how to reach RabbitMQ from nova role.
You can override the existing group vars (and host vars) by creating your own folder in /etc/openstack_deploy/group_vars (and /etc/openstack_deploy/host_vars respectively).
If you want to change the location of the override folder, you can
adapt your openstack-ansible.rc file, or export
GROUP_VARS_PATH and HOST_VARS_PATH during your
shell session.
Role vars
Because OpenStack-Ansible is following Ansible precedence, every role
vars/ will take precedence over group vars. This is
intentional. You should avoid overriding these variables.
User variables
If you want to override a playbook or a role variable, you can define
the variable you want to override in a
/etc/openstack_deploy/user_*.yml file.