Kill , shutDownServer, rs.remove

[James_Bailie]

In the lecture the example used rs.remove - which I did and all went fine. I see in the pinned post ‘Remove Member…’ they use Kill or shutDownServer and do not mention at all the rs.remove method.

Are all 3 equivalent ways to do the same thing? or am I misunderstanding a difference between them?

[Shubham_Ranjan]

Hi @James_58604,

Removing a Member from Replica Set or Replica Set as Whole

Removing a Member from Replica Set:

• Shutdown your node which you want to remove. Two ways to do this:
  • Kill the mongod process by checking pid through the command below. The first column will show pid . Make sure you kill only the respective node process.

 vagrant@m103:~$ ps -ef | grep mongod
   501  2809  2568   0  5:12PM ttys000    0:00.00 grep mongod --port 27002 --dbpath...
   520  2809  2568   0  5:12PM ttys000    0:00.00 grep mongod --port 27001 --dbpath...
 vagrant@m103:~$ kill 501

• Or Connect to the respective node, run:

  db.shutdownServer()

• Connect to your primary node of your replica set using mongo --port 27xxx

• Authenticate yourself on admin :

  > use admin
  > db.auth("m103-admin","m103-pass")

• Run rs.remove("...") . Example:

  > rs.remove("192.168.103.100:27027")

In this pinned post, we have recommended to first shutdown the node before removing it from the replica set.

You can do it either ways :

1. kill <pid>

2. Connect to the node which you want to remove from your replica set and run this command.

   db.shutdownServer()

And then finally authenticate yourself against the admin db if you have not done it already and then run the rs.remove("...") command.

and do not mention at all the rs.remove method.

It’s mentioned here.

Are all 3 equivalent ways to do the same thing? or am I misunderstanding a difference between them?

The answer is no. rs.remove() removes a node from the replica set and the other two commands just shut down the mongod instances.

Hope it helps!

If you have any other query then please feel free to get back to us.

Happy Learning

Thanks,
Shubham Ranjan
Curriculum Support Engineer