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Can we connect to Mongo DB without Mongos when we are not using Sharded Cluster ?

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I am in the process of migrating a replica set from a data center to AWS, but when I checked the settings, I noticed that the Sharding is not enabled, yet they are using 3 MongoS / Routers and 3 MongoC / Config servers - So since Sharding is not used in the current system, would it be safe to migrate the replica sets and not use MonogoS nor MongoC ? Can the users connect directly to Mongo database replica set without using MongoS ?
Or should I use at least 1 MongoS and 1 MongoC config server ?

posted Sep 19, 2015 by anonymous

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