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How can I create a replica set on MongoDB 4.0

How do I run replica set on MongoDB version 4.0. I am able to do it on the lower versions but I get an error asking me to downgrade my version and protocol version. Replication is not working on 4.0.

You have to migrate your replica set to 4.0 Upgrade a Replica set to 4.0 to use it with Mongo 4.0

Here is the whole doc about replica set : Replication

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