Question

I want to setup Master Slave config for Mongo DB on my Ubuntu Machine. I can see the setting to do this in /etc/mongodb.conf but that would make my DB either Master or Slave.

Is there any way I can run two different server on same machine and use one as Master and other as slave. I want to do this for testing purpose.

Answer 1

For testing purposes you can start both instances manually, take a look at this link. Quoting from the docs:

IMPORTANT
Replica sets replace master-slave replication for most use cases. If possible, use replica sets rather than master-slave replication for all new production deployments. This documentation remains to support legacy deployments and for archival purposes only.

Locate the folder where the MongoDB binaries are located:

mkdir -p ../master
./mongod --dbpath ../master --master --logpath ../master/master.log --port 27017

Then open up another terminal, navigate to the same folder and run this:

mkdir -p ../slave    
./mongod --dbpath ../slave --slave --logpath ../slave/slave.log --port 27018 --source=localhost:27017