About MySQL replicationMySQL replication is a process that allows you to easily maintain multiple copies of a MySQL data by having them copied automatically from a master to a slave database. This can helpful for many reasons including facilating a backup for the data,a way to analyze it without using the main database, or simply as a means to scale out.
This tutorial will cover a very simple example of mysql replication—one master will send information to a single slave. For the process to work you will need two IP addresses: one of the master server and and one of the slave.
This tutorial will use the following IP addresses:
220.127.116.119- Master Database
18.104.22.1686- Slave Database
SetupThis article assumes that you have user with sudo privileges and have MySQL installed. If you do not have mysql, you can install it with this command:
sudo apt-get install mysql-server mysql-client
Step One—Configure the Master DatabaseOpen up the mysql configuration file on the master server.
sudo nano /etc/mysql/my.cnfOnce inside that file, we need to make a few changes.
The first step is to find the next lines and comment them:
#bind-address = 127.0.0.1
This is because we want that our MySql listen to all the IP addresses.
The next configuration change refers to the server-id, located in the [mysqld] section. You can choose any number for this spot (it may just be easier to start with 1), but the number must be unique and cannot match any other server-id in your replication group. I'm going to go ahead and call this one 1.
Make sure this line is uncommented.
server-id = 1Move on to the log_bin line. This is where the real details of the replication are kept. The slave is going to copy all of the changes that are registered in the log. For this step we simply need to uncomment the line that refers to log_bin:
log_bin = /var/log/mysql/mysql-bin.logFinally, we need to designate the database that will be replicated on the slave server. You can include more than one database by repeating this line for all of the databases you will need.
binlog_do_db = newdatabaseAfter you make all of the changes, go ahead and save and exit out of the configuration file.
sudo service mysql restart or /etc/init.d/mysql restartThe next steps will take place in the MySQL shell, itself.
Open up the MySQL shell.
mysql -u root -pWe need to grant privileges to the slave. You can use this line to name your slave and set up their password. The command should be in this format:
GRANT REPLICATION SLAVE ON *.* TO 'slave_user'@'%' IDENTIFIED BY 'password';Follow up with:
FLUSH PRIVILEGES;The next part is a bit finicky. To accomplish the task you will need to open a new window or tab in addition to the one that you are already using a few steps down the line.
In your current tab switch to "newdatabase".
USE newdatabase;Following that, lock the database to prevent any new changes:
FLUSH TABLES WITH READ LOCK;Then type in:
SHOW MASTER STATUS;You will see a table that should look something like this:
mysql> SHOW MASTER STATUS;
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
| mysql-bin.000001 | 107 | newdatabase | |
1 row in set (0.00 sec)
This is the position from which the slave database will start replicating. Record these numbers, they will come in useful later.
Next run the quit; command to get the bash shell.
This is because If you make any new changes in the same window, the database will automatically unlock. For this reason, you should quit MySql command line or open a new tab or window and continue with the next steps there.
Proceeding the with the database still locked, export your database using mysqldump in the new window (make sure you are typing this command in the bash shell, not in MySQL).
mysqldump -u root -p --opt newdatabase > newdatabase.sqlNow, unlock the databases (making them writeable again). For that you must enter to the MySQL command line again. Finish up by exiting the shell (make sure you are typing this command in the MySQL, not in bash shell).
mysql -u root -p
Now you are all done with the configuration of the the master database.
Step Two—Configure the Slave DatabaseOnce you have configured the master database. You can put it aside for a while, and we will now begin to configure the slave database.
Log into your slave server, open up the MySQL shell and create the new database that you will be replicating from the master (then exit):
mysql -u root -p Enter password: CREATE DATABASE newdatabase; EXIT;Import the database that you previously exported from the master database.
mysql -u root -p newdatabase < /path/to/newdatabase.sqlNow we need to configure the slave configuration in the same way as we did the master:
sudo nano /etc/mysql/my.cnfWe have to make sure that we have a few things set up in this configuration. The first is the server-id. This number, as mentioned before needs to be unique. Since it is set on the default (still 1), be sure to change it's something different.
server-id = 2Following that, make sure that your have the following three criteria appropriately filled out:
relay-log = /var/log/mysql/mysql-relay-bin.log
log_bin = /var/log/mysql/mysql-bin.log
binlog_do_db = newdatabaseYou will need to add in the relay-log line: it is not there by default. Once you have made all of the necessary changes, save and exit out of the slave configuration file.
Restart MySQL once again:
sudo service mysql restart or /etc/init.d/mysql restartThe next step is to enable the replication from within the MySQL shell.
Open up the the MySQL shell once again and type in the following details, replacing the values to match your information:
mysql -u root -p
CHANGE MASTER TO MASTER_HOST='22.214.171.1249',MASTER_USER='slave_user',
This command accomplishes several things at the same time:
- It designates the current server as the slave of our master server.
- It provides the server the correct login credentials
- Last of all, it lets the slave server know where to start replicating from; the master log file and log position come from the numbers we wrote down previously.
Activate the slave server:
START SLAVE;You be able to see the details of the slave replication by typing in this command. The \G rearranges the text to make it more readable.
SHOW SLAVE STATUS\G quit;If there is an issue in connecting, you can try starting slave with a command to skip over it:
SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1; SLAVE START;All done.
IF YOU WANT TO SYNC SEVERAL BDS IN STEAD OF ONE DO THE FOLLOWING
MASTER: add lines to my.cnf
MASTER: SQL SYNTAX
GRANT REPLICATION SLAVE ON *.* TO 'user'@'%' IDENTIFIED BY 'password';
FLUSH TABLES WITH READ LOCK;
SHOW MASTER STATUS;
output> file | Position | Binlog_Do_DB
mysql-bin.000963 1570 database_name_1,database_name_2,database_name_3
SLAVE: add lines to my.cnf
SLAVE: SQL SYNTAX
CHANGE MASTER TO MASTER_HOST='192.168.0.2', MASTER_USER='user', MASTER_PASSWORD='password', MASTER_LOG_FILE='mysql-bin.000963', MASTER_LOG_POS=98;
SHOW SLAVE STATUS;