Login to instance

mongosh “mongodb://hostname_of_mongo:27017” –username XXXXXXXX –authenticationDatabase admin

Change Database

use admin

Create user

db.createUser({ user: "XXXXXXXX" , pwd: "XXXXXXXX", roles: ["userAdminAnyDatabase", "dbAdminAnyDatabase", "readWriteAnyDatabase"]})

Cluster management:

View Cluster Status 

rs.status()

Copy the replica set configuration to a variable.

In mongosh, use rs.conf() to retrieve the replica set configuration and assign it to a variable. For example:

cfg = rs.conf()

Change each member’s priority value.

Change each member’s members[n].priority value, as configured in the members array.

cfg.members[0].priority = 0.5cfg.members[1].priority = 2cfg.members[2].priority = 2

This sequence of operations modifies the value of cfg to set the priority for the first three members defined in the members array.

Assign the replica set the new configuration.

Use rs.reconfig() to apply the new configuration.

rs.reconfig(cfg)

This operation updates the configuration of the replica set using the configuration defined by the value of cfg.

Force a Member to Become Primary

Overview

You can force a replica set member to become primary by giving it a higher members[n].priority value than any other member in the set.

cfg.members[2].priority = 5