How to create a replica set in mongodb (Taken from M101JS Course)

mongodb_create-replica_set.sh

#!/usr/bin/env bash

# Create directories for data
mkdir -p /data/rs1 /data/rs2 /data/rs3

# Start 3 server processes on three diferent ports
mongod --replSet m101 --logpath "1.log" --dbpath /data/rs1 --port 27017 --oplogSize 64 --fork --smallfiles
mongod --replSet m101 --logpath "2.log" --dbpath /data/rs2 --port 27018 --oplogSize 64 --smallfiles --fork
mongod --replSet m101 --logpath "3.log" --dbpath /data/rs3 --port 27019 --oplogSize 64 --smallfiles --fork