MongoDB Master-Slave cluster with authentication setup

Master Server

1. create mongo db folder with sub folders like data, conf, && log

   mkdir -p /opt/mongo/data

   mkdir -p /opt/mongo/conf

   mkdir -p /opt/mongo/log

2. create a keyfile to secure mongo DB custer traffic. scp this file to slave server

   cd /srv/mongodb/

   openssl rand -base64 741 >>mongo-key

   chmod 700 mongo-key

3. vi /opt/mongo/conf/master.conf

   dbpath=/opt/mongo/data

   logpath=/opt/mongo/log/mongodb.log

   logappend=true

   fork=true

   port=27017

   oplogSize=2048
4. start mongo with command mongod --config /opt/mongo/conf/master.conf

5. login mongo and create admin account && local account repl for the cluster

   > use admin

   > db.createUser({user:"root", pwd:"123456", roles:[{role:"root", db:"admin"}]})

   > db.createUser({user:"repl", pwd:"123456", roles:[{role:"dbOwner", db:"local"}]})

   > show users

   {

       "_id" : "admin.root",

       "user" : "root",

       "db" : "admin",

       "roles" : [

           {

               "role" : "root",

               "db" : "admin"

           }

       ]

   }

   {

       "_id" : "admin.repl",

       "user" : "repl",

       "db" : "admin",

       "roles" : [

           {

               "role" : "dbOwner",

               "db" : "local"

           }

       ]

   }

6. modify the conf file and add the last 3 lines into the file

   dbpath=/opt/mongo/data

   logpath=/opt/mongo/log/mongodb.log

   logappend=true

   fork=true

   port=27017

   oplogSize=2048

    

    

   master=true

   auth=true

   keyFile=/opt/mongo/mongo-key

7. restart mongo with new config file

   mongod --config /opt/mongo/conf/master.conf --shutdown

   mongod --config /opt/mongo/conf/master.conf

Slave Server

1. create mongo db folder with sub folders like data, conf, && log; same as master

2. copy the keyfile to mongo folder and modify the slave.conf

   dbpath=/opt/mongo/data

   logpath=/opt/mongo/log/mongodb.log

   logappend=true

   fork=true

   port=27017

   oplogSize=2048

    

    

   slave=true

   auth=true

   keyFile=/opt/mongo/mongo-key

   source = [master ip]:[port]

3. start slave server

   mongod --config /opt/mongo/conf/slave.conf

4. login slave with admin credential, and active slave (important)

   rs.slaveOk()

Test

Create a test db and insert values into a new collection on master node

> use test

switched to db test

> db.products.insert( { item: "card", qty: 15 } )

WriteResult({ "nInserted" : 1 })

> show collections

products

Login to slave node and then verfiy if the new added test db exisits.

After the verification done, remember to delete the test db with command 

> use test

switched to db test

> db.dropDatabase()

{ "dropped" : "test", "ok" : 1 }