Database Reference
In-Depth Information
Understanding the migration process
As you already learned in previous chapters, there are two main ways to deploy a Mon-
goDB instance: using replica sets for deployment in a production environment and using a
single
mongod
instance for development or testing.
Although it's not a good idea to use a single
mongod
instance for the production environ-
ment, we will introduce both methods to move a single
mongod
instance and replica set.
First of all, there is a simple hack to migrate a replica set to another server. As you know, if
you add a new member to an existing replica set, this member will synchronize its
oplog
with the current
primary
node. This is shown in the following diagram:
