MySql database replication

This was my first time setting up a MySql Database Replication instance between two servers. The instructions that I used from the mysql.com (How to set up Replication) was straight forward but there were a few gotcha’s which I decided to document in case I forget. If you’re an expert in this area and the instructions are incorrect please contact me so I can amend and update.

On the Master Server

This is the server which will have the master database. Master meaning that the information in this database will be replicated and copied to the slave database.

Create replication user account

Click on Add slave replication user

MySQL Add slave replication user

Enter all details (username, password)

MySQL Add slave replication user details

MySQL Add slave replication user list

This is the account that will be used on the slaves to connect to the master to authenticate and replicate the tables.

Export Database

According to the instructions from Mysql.com you need to flush the tables with read lock. To do this start mysql and enter:

mysql> FLUSH TABLES WITH READ LOCK;

Now if your database is empty I don’t believe you need to run this step.

Then you need to export the database by using the following command:

shell> mysqldump --all-databases --master-data > dbdump.db

It’s important you use –master-data so that it locks all tables in a seperate session. If you have a large database you can use the command gzip

shell> mysqldump --all-databases --master-data | gzip > dbdump.db

That’s pretty much all you need to do on the master server. You also need to make sure that your firewall allows incoming connection using port 3306.

Once you have configured the slave you can check the status on master to see which clients are replicating by clicking on Show Connected Slaves.

MySQL Show Connected slaves

On the slave server

You will need to import the mysql dump. So follow these steps

Start the slave, using the --skip-slave-start option so that replication does not start.
Import the dump file:
```
shell> mysql < fulldb.dump
```

Click configure

mysql slave replication configure

Enter the details that was used on the master server.

: mysql slave replication configure settings

Click Go and check the slave status

mysql slave replication check slave status

Once you have added the master settings you will have the option to check the master status

Add –report-host=host_name in the my.ini (I’m using WAMP). The hostname you can change to a unique word to identify your slaves.

I hope this has helped someone start replicating their mysql database. If there’s anything that I can improve in this post then please leave me a comment as I’m no expert in this area.

NOTE: I was getting some duplicate 1062 errors when Importing the dump file, so I just added this line to the my.ini file.

slave-skip-errors = 1062

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