Navigate to Amazon Document DB console and locate your cluster using the cluster identifier
demo-documentdb. Check the box for the cluster identifier with the Role
Add instances from the Actions menu as shown below:
In the Add Instances window enter following :
Choose Instance class as
db.t3.medium to add the first replica.
Choose Add additional instance and Instance class as
db.t3.medium to add the second replica.
You can optionally select a Promotion Tier to define a failover preference. Choose Create to create both of the replica instances.
You will now see the two new Replica instances in
creating status. In a few minutes, the new instances will be available to provide additional capacity to the cluster.
Navigate to AWS Cloud9 management console and run the following command at the DocumentDB prompt to review the cluster status. If you are no longer connected to DocumentDB cluster, you will need to re-connect using an earlier step: Connecting to Amazon Document DB Cluster
When both Replica instances become available, the output should look similar to below indicating that the cluster has 1 writer and 2 Secondary nodes.
Congratulations! You have successfully scaled the cluster. In the next lab you will delete this cluster.