MongoDB Replication on CentOS 7

I. Mongo 1
IP: 192.168.111.142
yum install epel-release -y
yum update -y
vi /etc/hosts
192.168.111.142 mongo01
192.168.111.143 mongo02
192.168.111.144 mongo03
setenfore 0
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
vi /etc/yum.repos.d/mongodb-org-4.2.repo
[mongodb-org-4.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.2.asc
yum install -y mongodb-org
openssl rand -base64 756 > mongo.key
mkdir /opt/mongo
mv ~/mongo.key /opt/mongo
scp /opt/mongo/mongo.key [email protected]:/opt/mongo/
scp /opt/mongo/mongo.key [email protected]:/opt/mongo/
chmod 400 /opt/mongo/mongo.key
chown mongod:mongod /opt/mongo/mongo.key
mongo
use admin
db.createUser({user: "happy", pwd: "TDAn94xB6Bw3uZmW", roles:[{role: "root", db: "admin"}]})
vi /etc/mongod.conf
net:
  port: 27017
  bindIp: 0.0.0.0
security:
  keyFile: /opt/mongo/mongo.key
replication:
  replSetName: happy
firewall-cmd --permanent --add-port=27017/tcp
firewall-cmd --reload
systemctl restart mongod
systemctl enable mongod
mongo -u happy -p --authenticationDatabase admin
rs.initiate()
rs.add("mongo02")
rs.addArb("mongo03")
rs.conf()
rs.status()
rs.isMaster()
mongo -u happy -p --authenticationDatabase admin
use demo
for (var i = 0; i <= 10; i++) db.exampleCollection.insert( { x : i } )
II. Mongo 2
IP: 192.168.111.143
yum install epel-release -y
yum update -y
vi /etc/hosts
192.168.111.142 mongo01
192.168.111.143 mongo02
192.168.111.144 mongo03
setenfore 0
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
vi /etc/yum.repos.d/mongodb-org-4.2.repo
[mongodb-org-4.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.2.asc
yum install -y mongodb-org
mkdir /opt/mongo
chmod 400 /opt/mongo/mongo.key
chown mongod:mongod /opt/mongo/mongo.key
mongo
use admin
db.createUser({user: "happy", pwd: "TDAn94xB6Bw3uZmW", roles:[{role: "root", db: "admin"}]})
vi /etc/mongod.conf
net:
  port: 27017
  bindIp: 0.0.0.0
security:
  keyFile: /opt/mongo/mongo.key
replication:
  replSetName: happy
firewall-cmd --permanent --add-port=27017/tcp
firewall-cmd --reload
systemctl restart mongod
systemctl enable mongod
netstat -plntu
mongo -u happy -p --authenticationDatabase admin
db.getMongo().setSlaveOk()
use demo
db.exampleCollection.find()
III. Mongo 3
IP: 192.168.111.144
yum install epel-release -y
yum update -y
vi /etc/hosts
192.168.111.142 mongo01
192.168.111.143 mongo02
192.168.111.144 mongo03
setenfore 0
sed -i --follow-symlinks 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
vi /etc/yum.repos.d/mongodb-org-4.2.repo
[mongodb-org-4.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.2.asc
yum install -y mongodb-org
mkdir /opt/mongo
chmod 400 /opt/mongo/mongo.key
chown mongod:mongod /opt/mongo/mongo.key
mongo
use admin
db.createUser({user: "happy", pwd: "TDAn94xB6Bw3uZmW", roles:[{role: "root", db: "admin"}]})
vi /etc/mongod.conf
net:
  port: 27017
  bindIp: 0.0.0.0
security:
  keyFile: /opt/mongo/mongo.key
replication:
  replSetName: happy
firewall-cmd --permanent --add-port=27017/tcp
firewall-cmd --reload
systemctl restart mongod
systemctl enable mongod