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I have configured a three-node replica set in MongoDB; replication is in sync.

I am able to connect to each server individually, and using each server's private IP address I can to connect to the replica set like this:

mongo --host rs0/10.X.X.X:27017,10.X.X.X:27017,10.X.X.X:27017 -u root -p abc123 --authenticationDatabase admin

But when I try to connect to the replica set using the servers' public IP addresses, like this:

mongo --host rs0/52.X.X.X:27017,52.X.X.X:27017,52.X.X.X:27017 -u root -p abc123 --authenticationDatabase admin

I get an error: "No primary detected for set rs0".

Vince Bowdren
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shyam rakhecha
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    This really should be asked on [dba,stackexchange.com](https://dba.stackexchange.com) which is for questions and answers relating to database administration and configuration. StackOverflow is for :"programming" based questions, of which this is not. Please move your post to the appropriate site instead of posting here. – Neil Lunn Jun 13 '17 at 05:49

3 Answers3

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When you connect to the replica set, you should use the same addresses (ip addresses or host names) as the nodes use for each other in the replica set configuration. For replica set deployment, you need to:

Ensure that network traffic can pass between all members of the set and all clients in the network securely and efficiently.

In practice, it is best not to configure your replica set using public ip addresses; it is more secure to use the private ip addresses, which helps ensure that your database can only receive connections from authorised locations.

Vince Bowdren
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this might be one of the reason.

You should add all 3 servers public IP in to the bind ip values in all 3 servers /etc/mongod.conf

if your are using AWS, you need to allow all this IP for inbound access to another server.

Manivannan Thirugnanam
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Thanks guys for responses, It needed to configure replica with public Ips in rs.config

shyam rakhecha
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