I am new to Ansible, but I have to maintain a set of playbooks, which correspond to services to be setup in a given environment. They need to be assigned a port, certificates, etc. This results in many files with lists of essentially always the same names and an assignment to them.
In many cases I think I can easily reuse the service_name as variable, but when mapping to IPs, ports or other numeric identifiers I have not yet figured out a way to deterministically assign them different numbers in a way that is reproducible, and preferably remains the same even when new services are added. I have considered using a SQLite database to store the services from and to generate the values from their ids, but I have no idea how to integrate that with Ansible.
I assume that assigning increasing port numbers is not something entirely new; it is something a lot of sysadmins to on a day-to-day basis so there has to be some way to do that.
Edit: We directly add the port numbers etc. in
group_vars/all.yml like this:
ports: service1:1024 service2:1025 service3:1026
The inventory is generated automatically, since we create additional jails (BSD) and depends on the roles that will be executed.