replicaset_initiate.sh

#!/bin/bash

######## Run this bash script on ONE replica set node to initiate the Mongodb replica set #########

# HOWTO:
	# System recommendation : Ubuntu 16.04	
	# Download the script on your master/primary replica set node
	# Open in bash and make it executable with command: chmod +x replicaset_initiate.sh
	# Run with command: sudo ./replicaset_initiate.sh

# OTHER USEFUL SCRIPTS:
	# For MongoDB installation: https://gist.github.com/Maria-UET/1368387e2e72d2de96fc824919dad176
	# For making a MongoDB replica set with three nodes: https://gist.github.com/Maria-UET/af4332f6dd9e57f2d0f6141dbb8dd447




# The username of your MongoDB user
USR="admin"
# The password of your MongoDB user. Password should be ideally read from a config.ini file, keeping passwords in bash scripts is not secure. 
PASS="password123"
DB="admin"
ROLE="root"
USER="manager"

# Replace with the hostnames of each node in the replica set
NODE1='node1'
NODE2='node2'
NODE3='node3'

PORT=27017

# Select ONLY one node as primary and set its priority : 1
mongo config = {
     _id : "rs0",
         members : [
             {_id : 0, host : "'$NODE1':$PORT", priority : 0}, 
             {_id : 1, host : "'$NODE2':$PORT", priority : 0}, 
             {_id : 2, host : "'$NODE3':$PORT", priority : 1},
    
         ]
    }

mongo rs.initiate(config)
sudo mongo --username $USR --password $PASS