Setting up a replica set

In this section, we will go over the most common deployment procedures to set up a replica set. These involve either converting a standalone server into a replica set or setting up a replica set from scratch.

Converting a standalone server into a replica set

To convert a standalone server into a replica set, we first need to cleanly shut down the mongo server as follows:

> use admin
> db.shutdownServer()

Then, we start the server with the --replSet configuration option via the command line as follows (or by using a configuration file, as we will explain in the following section):

1. First, we connect (via the mongo shell) to the new replica set-enabled instance as follows:

   > rs.initiate()

2. Now, we have the first server of our replica set. We can add the other servers (which must have also been started with --replSet) by using the mongo shell as follows: 

   > rs.add("<hostname><:port>")

Note

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