When an OpenStack infrastructure engineer installs a brand new service in an OpenStack environment, that OpenStack service's package will most likely use the following directories by default:

• Configuration files

/etc/<service-name>/*

In this location, we find configuration files for the respective service, typically using the .conf file extension. These files control the behavior of the API and any associated components that may be installed on the machine. This is also the directory where the policy.json authorization file resides.

• Data files

/var/lib/<service-name>/*

Data files are where the OpenStack service will store any relevant data. For example, in /var/lib/glance, Glance will store images in this directory. In /var/lib/nova, Nova will store the actual data written to an instance's ephemeral disk as well...