dd8c9932f4
1. Adds new structure to inventory 2. Updates index files 3. Corrects an instance of passive voice. Change-Id: I1e746bfbda430076459d757039bc21f9df6a4a8a
3.3 KiB
Generating the Inventory
The script that creates the inventory is located at
playbooks/inventory/dynamic_inventory.py.
Executing the dynamic_inventory.py script
When running an Ansible command (such as ansible,
ansible-playbook or openstack-ansible) Ansible
executes the dynamic_inventory.py script and use its output
as inventory.
Run the following command:
# from the playbooks directory
inventory/dynamic_inventory.py --config /etc/openstack_deploy/This invocation is useful when testing changes to the dynamic inventory script.
Inputs
The dynamic_inventory.py takes the --config
argument for the directory holding configuration from which to create
the inventory. If not specified, the default is
/etc/openstack_deploy/.
In addition to this argument, the base environment skeleton is
provided in the playbooks/inventory/env.d directory of the
OpenStack-Ansible codebase.
Should an env.d directory be found in the directory
specified by --config, its contents will be added to the
base environment, overriding any previous contents in the event of
conflicts.
Note
In all versions prior to , this argument was --file.
The following file must be present in the configuration directory:
openstack_user_config.yml
Additionally, the configuration or environment could be spread between two additional sub-directories:
conf.denv.d(for environment customization)
The dynamic inventory script does the following:
- Generates the names of each container that runs a service
- Creates container and IP address mappings
- Assigns containers to physical hosts
As an example, consider the following excerpt from
openstack_user_config.yml:
- identity_hosts:
- infra01:
ip: 10.0.0.10
- infra02:
ip: 10.0.0.11
- infra03:
ip: 10.0.0.12
The identity_hosts dictionary defines an Ansible
inventory group named identity_hosts containing the three
infra hosts. The configuration file
playbooks/inventory/env.d/keystone.yml defines additional
Ansible inventory groups for the containers that are deployed onto the
three hosts named with the prefix infra.
Note that any services marked with is_metal: true will
run on the allocated physical host and not in a container. For an
example of is_metal: true being used refer to
playbooks/inventory/env.d/cinder.yml in the
container_skel section.
Outputs
Once executed, the script will output an
openstack_inventory.json file into the directory specified
with the --config argument. This is used as the source of
truth for repeated runs.
Note
The openstack_inventory.json file is the source of truth
for the environment. Deleting this in a production environment means
that the UUID portion of container names will be regenerated, which then
results in new containers being created. Containers generated under the
previous version will no longer be recognized by Ansible, even if
reachable via SSH.
The same JSON structure is printed to stdout, which is consumed by Ansible as the inventory for the playbooks.