I am on the second lab of chapter 3, trying to set up a sharded cluster. I have created the 3-node Config server replica set and I am about to start up a MongoS process.
The sample config file came with lab has the following for “configDB” parameter:
However, if I follow the lecture prior to the lab, the configDB should contain information on all 3 config servers, i.e.:
So, which is it? Do I need all 3 config server nodes, or having only the primary node is good enough?