multi-master with puppetdb

[Alexander Swen]

hi,

we consider to run a second instance of our puppet master and would like to know how we should do this.

We have one puppet master with a puppetdb instance on the same server. Puppetdb uses a postgres db on a postgr cluster.

My main concern is: can we run puppetdb on the second box two? with the same db as the first one?

thanks for your advise, best regards,

Alex

[Chris Price]

Hello Alexander,

There are a few things to consider before deciding how you'd like to set this up.

The first question, I think, is: why do you want to run two puppetdb services rather than just pointing both puppet masters to a single puppetdb service?  If you're goal is to share the postgres database, then in most cases, that will be your bottleneck (as opposed to the puppetdb service itself).  Thus, you might not be buying yourself much by adding a second puppetdb service.

Second: do you have a shared CA for the two puppet masters?  Since the puppetdb service's SSL auth will be based on a single puppet master's CA, you won't be able to connect to a single puppetdb service with two different masters using two different CA's.

Third: If you do decide to run two puppetdb services pointing to a single postgres instance--this *should* work, but it's not necessarily a recommended configuration.  You'd need to be very careful to make sure that the two puppetdb services were always running the *exact* same version as one another; if you were ever to upgrade one of them without upgrading the other, you might trigger a schema migration in the postgres database that would render it incompatible with the older version of puppetdb.

Please let us know if you have any additional questions!

Thanks

Chris