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How to set up bindIp for a replica set?

Posted March 31, 2020 1k views
MongoDB

I am using the Ubuntu 18.04 MongoDB one click installation droplet. I have setup three droplets, and want to set up a replica set.
I was trying to follow some tutorials:

here

and here

I am stuck at setting a bindIp, and whenever I add the IP of my other droplets to bindIp, mongod won’t start, failing with this error:


Mar 31 15:52:01 db3.muhive.com systemd[1]: mongod.service: Main process exited, code=exited, status=48/n/a
Mar 31 15:52:01 db3.muhive.com systemd[1]: mongod.service: Failed with result 'exit-code'.

To be clear, this works:

# network interfaces
net:
  port: 27017
  bindIp: 127.0.0.1

but this doesn’t

# network interfaces
net:
  port: 27017
  bindIp: 127.0.0.1,db1.munhive.com,db2.munhive.com,db3.munhive.com

Pinging each of those individually does work though. How do I set this up? Do I need to configure a private network?

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deformercoding
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deformercoding

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1 answer
Rajkishore May 12, 2021

Hi @deformercoding

We have documentation to configure remove access for mongodb, Please feel free to check it out:

https://www.digitalocean.com/community/tutorials/how-to-configure-remote-access-for-mongodb-on-ubuntu-20-04

In the /etc/mongod.conf file make changes to bindIP as below to three mongodb nodes when you are setting up replication.

In mongodb1 server 

# network interfaces
net:
  port: 27017
  bindIp: 127.0.0.1,mongodb1

In mongodb2 server 

# network interfaces
net:
  port: 27017
  bindIp: 127.0.0.1,mongodb2

In mongodb3 server 

# network interfaces
net:
  port: 27017
  bindIp: 127.0.0.1,mongodb3

Once you made these changes, restart mongod service on all 3 nodes.

Always when you are binding to a non-localhost, please make sure to secure the database by enabling authentication.

https://www.digitalocean.com/community/tutorials/how-to-secure-mongodb-on-ubuntu-20-04

Hope this helps!

Regards,
Rajkishore

How To Secure MongoDB on Ubuntu 20.04
by Mark Drake
MongoDB doesn't have authentication enabled by default, meaning that any user with access to the server where the database is installed can add and delete data without restriction. In order to secure this vulnerability, this tutorial will walk you through creating an administrative user and enabling authentication. You'll then test to confirm that only this administrative user has access to the database.
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