Mysql双机热备主从配置

replication on mysql:

Master/Slave. 

Master server is the production MySQL instance.

Slave server is the java host (123.57.39.*).

First we need to install MySQL server and client on the java host(123.57.39.*).

1.in master execute:

CREATE USER 'replica'@'123.57.39.*' IDENTIFIED BY 'replica@123';

GRANT REPLICATION SLAVE ON *.* TO 'replica'@'123.57.39.*';

flush privileges;

2.

add the following to [mysqld] segment in /etc/my.cnf of master DB.  And make sure mysql user is the owner of log-bin direcotry.  Otherwise you 

will get error when you startup MySQL.

server-id=1

log-bin=/var/lib/mysql/binlog/mysql-bin

expire_logs_days=7

3.

On Slave,add the following to [mysqld] segment in /etc/my.cnf

server-id=2

innodb_flush_log_at_trx_commit=2 //this line is not required,just improve innodb performance

expire_logs_days=7

4.in master,then copy data to slave

mysqldump --master-data=2 --user=root --password=fadfafafaD  --single-transaction --all-databases > replica.sql

5.copy the replica.sql to slave server,then import data in slave.

mysql --user=root --password=fadfafafaD  < replica.sql

6.change master settting on slave;view the privious replica.sql,using "more replica.sql",you will see some text like the follwing,

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=107;

record the red font part,then fill them into the following statement,then execute the following statement in slave mysql server.

CHANGE MASTER TO

MASTER_HOST = '123.57.38.*',

MASTER_USER = 'replica',

MASTER_PASSWORD = 'replica@123',

MASTER_LOG_FILE = 'mysql-bin.000001',

MASTER_LOG_POS = 107;

7.finally start slave;

Be don't forget to issue "show slave status\G' to check whether slave runs normally.