openstack-ansible-security/doc/source/developer-notes/V-51391.rst

When AIDE is first installed for V-38429, a new database will be created. The creation process takes some time because AIDE needs to review each file in its list of monitored files to get timestamps and hashes. The initialization will be forked into the background so that it doesn't slow down the playbook run.

Some directories are excluded from AIDE runs to prevent AIDE from wandering into directories where it shouldn't be hashing/monitoring files. The defaults/main.yml file has some recommended directories as part of the aide_exclude_dirs variable.