I have mongo Replica Set with 2 Mongo Nodes and 1 Arbiter and I just need to extend expiration date for mongo SSL certificates. I won't change the names of keys and key attributes like CN, O and etc. The question is should I then restart all mongo services or not ?
As far as I know MongoDB does not presently support online certificate rotation.
Meaning, you need to restart each node in sequence after you change the certificates.