Run script against replica set in MongoDB

Question

I have replica set of 3 nodes and I want to run a cleanup script against it every end of day. What I would do if there was only single node would be a simple bash script:

~/mongo/bin/mongo host:port cleanupScript.js

But since I want to run the same script against replica-set I can't use this approach. I would need to somehow find which node is primary and run the script against that node.

So the question: Is there a way how to run the script against whole replica set and let the mongo process pick the primary node and execute on it?

Thanks!

Answer 1

The mongo shell can connect directly to a replica set - this works with 2.4 (current), 2.2 (previous) and 2.0 (the version before that).

Assuming you have a replica set called myrs and your hosts are host1:27017 and host2:27017, use the following syntax:

mongo --host myrs/host1:27017,host2:27017

The shell will figure out the rest, including connecting to the primary and if the primary steps down or goes away it will reconnect to the new primary once it's elected.