I'd like to get some feedback on whether or not implementing a DNS SRV feature
for connecting to PostgreSQL would be desirable/useful.
A big +1.
We currently use SRV records to tell postgresql what kind of server it is. This way all of our postgresql servers have an identical configuration, they just tailor themselves on startup as appropriate:
The above record in our case declares who the master is. If the postgresql startup says “hey, that’s me” it configures itself as a master. If the postgresql startup says “hey, that’s not me” it configures itself as a slave of the master.
We also use TXT records to define the databases we want (with protection against DNS security issues, we never remove a database based on a TXT record, but signed DNS records will help here).
We use a series of systemd “daemons” that are configured to run before and after postgresql to do the actual configuration on bootup, but it would be great if postgresql could just do this out the box.