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

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