install-mongodb-on-ubuntu

install-mongodb

wget -qO - https://www.mongodb.org/static/pgp/server-4.2.asc | sudo apt-key add -
#wget -qO - https://www.mongodb.org/static/pgp/server-4.0.asc | sudo apt-key add -

echo "deb [ arch=amd64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.2 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.2.list
#echo "deb [ arch=amd64 ] https://repo.mongodb.org/apt/ubuntu bionic/mongodb-org/4.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.0.list

sudo apt-get update
sudo apt-get install -y mongodb-org=4.2.3 mongodb-org-server=4.2.3 mongodb-org-shell=4.2.3 mongodb-org-mongos=4.2.3 mongodb-org-tools=4.2.3
#sudo apt-get install -y mongodb-org=4.0.20 mongodb-org-server=4.0.20 mongodb-org-shell=4.0.20 mongodb-org-mongos=4.0.20 mongodb-org-tools=4.0.20
sudo systemctl start mongod
sudo systemctl enable mongod

mongo
use admin
db.createUser(
  {
    user: "root",
    pwd: "Passw0rd",
    roles: [ { role: "root", db: "admin" } ]
  }
)
#add below script  /etc/mongod.comf 
security:
  authorization: 'enabled'
net:
  port: 27017
  bindIp: 0.0.0.0

rs0

openssl rand -base64 756 > <path-to-keyfile>
chmod 400 <path-to-keyfile>

edit /etc/mongodb.conf

security:
  keyFile: <path-to-keyfile>
replication:
  replSetName: <replicaSetName>
  
  
  connect to mongo local and run
  
  rs.initiate(
  {
    _id : <replicaSetName>,
    members: [
      { _id : 0, host : "mongo1.example.net:27017" },
      { _id : 1, host : "mongo2.example.net:27017" },
      { _id : 2, host : "mongo3.example.net:27017" }
    ]
  }
)

Use rs.status() to locate the primary member.

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