Mongodb replicaset config - erase all config and begin from scratch

[iryndin]

Hi all,

I was playing with Mongodb Replica Sets (3-node replica set - all
nodes are full-servers) and found myself stuck into config issues and
all that stuff.

Is there a way to clear all the configs related to replica set and
begin playing from scratch with this?

Smth like (my fantasy) rs.eraseAllConfigs()

=)))

Regards,
Ivan

[Kristina Chodorow]

All of the replication information is kept in the local database.
Thus, the easiest way is to shut all of the members down, delete the
local.* files from the primary, delete all of the data files from the
other members, and start everyone back up again.

[Tim]

hi,

would that work with

mongo DB_NAME --eval 'db.dropDatabase();
for every DB, or do I have to delete these files manually?

best regards

[Kristina Chodorow]

Do not try to drop the local DB that way.  1) It won't work on the secondaries and 2) As soon the primary dropped it, the secondaries would be unable to replicate from the primary, since local is what's used for replication.

Shut down the servers and delete the files manually.

[Tilo]

you will also need to edit the /etc/mongod.conf file to uncomment the `replSet` 

[Marco Berri]

Hi!

I Use this procedure on MongoDB 3.0.8

https://gist.github.com/marcoberri/0dbab369afa69593d77b#file-downgrade_mongodb_replica_to_standalone-txt