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https://access.redhat.com/site/documentation/en-US/OpenShift_Enterprise/2/html-single/Deployment_Guide/index.html#sect-Configuring_Redundancy 5.8.4.3. MongoDB Procedure 5.18. To Configure the Broker Application to Use a Replica Set: Step 2. Remove "Set MONGO_REPLICA_SETS to true" and the line below with MONGO_REPLICA_SETS="true" It doesn't hurt anything to put this in the file, but it's not in the broker.conf and doesn't do anything if added. Code now determines whether it's a replica set based on the MONGO_HOST_PORT var.