How do I copy a database from one MongoDB server to another?

I have two mongodbs in different server, both start with --auth. Now I want to copy a db from one server to another.

> mongo
> use admin
> db.copyDatabase("mydb","mydb","another_server")

It shows:

{ "errmsg" : "", "ok" : 0 }

And:

> db.getLastError()
null

Seems no error, but the copy is not successful. What's the correct command to use?

If you are using --auth, you'll need to include your username/password in there...

Also you must be on the "destination" server when you run the command.

db.copyDatabase(<from_db>, <to_db>, <from_hostname>, <username>, <password>);

If all that doesn't work, you might want to try something like creating a slave of the database you want to copy ...

Starting from Mongo version 3.2 you can do it by using mongodump/mongorestore:

mongodump  --host <from_host> --db <from_db> --archive | mongorestore --host <to_host> --archive

Additional info could be found at:

https://docs.mongodb.com/manual/reference/program/mongodump/ https://docs.mongodb.com/manual/reference/program/mongorestore/

To make remote mongo reachable you can create ssh tunnel to it:

creates a tunnel to the remote mongodb server and tunnels it through port 27117 to the local client

ssh -fN -L 27117:localhost:27017 <remote_host> 

In this case the command to run on the local machine you want to restore to could be:

mongodump  --port 27117 --db <from_db> --archive | mongorestore --archive