NixHat Solutions

Mysql Replication using SSH Tunneling

RETURN TO PART-1

Installation/Configuration of Saturn (mysql slave)

  • yum install -y mysql-server

  • Update the following values in /etc/my.cnf

    • server-id = 2

    • start the mysql server

  • Export the db dump.

    • cat universe.sql | mysql

  • Configure SSH Tunneling. Here, we will use a local user account

    • adduser sqltunel

    • su – sqltunnel

    • ssh-keygen -t rsa

    • Create a user account named sqltunnel in master server and copy the public key from slave to authorized_keys of master.

    • Verify the ssh connectivity and confirm that you are able to login without password

    • Lets create the ssh tunnel from slave server

      • ssh -f <master-ip> -L 3305:127.0.0.1:3306 -N

    • Now, the port 3305 in slave is actually, the port 3306 in master server.

    • Lets verify mysql connectivity

      • mysql -h 127.0.0.1 -P 3305 -u dbuser -p

Once its verified and confirmed that mysql ssh tunnel is working, lets move onto completing the final steps of replication.

  • Login to mysql and configure the master server details. Execute the mysql command

    • CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=103, MASTER_HOST='127.0.0.1', MASTER_PORT=3305, MASTER_USER='replication', MASTER_PASSWORD='slave';

 

MASTER_LOG_FILE and MASTER_LOG_POS -> the value is from the output which you got from master when you type “show master status”

  • mysql> START SLAVE;

  • Verify Mysql Replication status in slave server

    • mysql > show slave status\G

It should give you output “Yes” for Slave_IO_Running and Slave_SQL_Running.


 

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