replicaSetSetup.md

The configuration file for the first node (node1.conf):

storage:
  dbPath: /var/mongodb/db/node1
net:
  bindIp: 192.168.103.100,localhost
  port: 27011
security:
  authorization: enabled
  keyFile: /var/mongodb/pki/m103-keyfile
systemLog:
  destination: file
  path: /var/mongodb/db/node1/mongod.log
  logAppend: true
processManagement:
  fork: true
replication:
  replSetName: m103-example

Creating the keyfile and setting permissions on it:

sudo mkdir -p /var/mongodb/pki/
sudo chown vagrant:vagrant /var/mongodb/pki/
openssl rand -base64 741 > /var/mongodb/pki/m103-keyfile
chmod 400 /var/mongodb/pki/m103-keyfile

Creating the dbpath for node1:

mkdir -p /var/mongodb/db/node1 Starting a mongod with node1.conf:

mongod -f node1.conf

Copying node1.conf to node2.conf and node3.conf:

cp node1.conf node2.conf
cp node2.conf node3.conf

Editing node2.conf using vi:

vi node2.conf

Saving the file and exiting vi:

:wq

node2.conf, after changing the dbpath, port, and logpath:

storage:
  dbPath: /var/mongodb/db/node2
net:
  bindIp: 192.168.103.100,localhost
  port: 27012
security:
  keyFile: /var/mongodb/pki/m103-keyfile
systemLog:
  destination: file
  path: /var/mongodb/db/node2/mongod.log
  logAppend: true
processManagement:
  fork: true
replication:
  replSetName: m103-example

node3.conf, after changing the dbpath, port, and logpath:

storage:
  dbPath: /var/mongodb/db/node3
net:
  bindIp: 192.168.103.100,localhost
  port: 27013
security:
  keyFile: /var/mongodb/pki/m103-keyfile
systemLog:
  destination: file
  path: /var/mongodb/db/node3/mongod.log
  logAppend: true
processManagement:
  fork: true
replication:
  replSetName: m103-example

Creating the data directories for node2 and node3:

mkdir /var/mongodb/db/{node2,node3}

Starting mongod processes with node2.conf and node3.conf:

mongod -f node2.conf
mongod -f node3.conf

Connecting to node1:

mongo --port 27011

Initiating the replica set:

rs.initiate()

Creating a user:

use admin
db.createUser({
  user: "m103-admin",
  pwd: "m103-pass",
  roles: [
    {role: "root", db: "admin"}
  ]
})

Exiting out of the Mongo shell and connecting to the entire replica set:

exit
mongo --host "m103-example/192.168.103.100:27011" -u "m103-admin"
-p "m103-pass" --authenticationDatabase "admin"

Getting replica set status:

rs.status()

Adding other members to replica set:

rs.add("m103.mongodb.university:27012")
rs.add("m103.mongodb.university:27013")

Getting an overview of the replica set topology:

rs.isMaster()

Stepping down the current primary:

rs.stepDown()

Checking replica set overview after election:

rs.isMaster()