MySQL入门04-MySQL主从配置

环境:CentOS 6.7 + MySQL 5.6.30
主节点:192.168.56.102
从节点:192.168.56.103
已经分别安装好单机MySQL,现在配置两台MySQL的主从复制。

1.主节点授权同步用户

官方文档是分两步进行的:

mysql> CREATE USER ‘repl’@’%.mydomain.com’ IDENTIFIED BY ‘slavepass’;

mysql> GRANT REPLICATION SLAVE ON . TO ‘repl’@’%.mydomain.com’;

实际上一条命令即可:

grant replication slave,reload,super on *.* to 'repl'@'192.168.56.103' identified by 'asdfjkl';

2.主节点修改配置文件

vi /data/mysqldata/3306/my.cnf

添加内容,其实主要是server-id=102,另外对于InnoDB,官档建议加两个参数:

[mysqld]
server-id=102
#binlog-ignore-db = mysql
#replicate-do-db = xxdb

#InnoDB
innodb_flush_log_at_trx_commit=1
sync_binlog=1

主节点重启MySQL:

shell> mysqladmin shutdown
shell> mysqld_safe --defaults-file=/data/mysqldata/3306/my.cnf &

3.从节点修改配置文件

vi /data/mysqldata/3306/my.cnf

添加:

[mysqld]
server-id=103
#replicate-do-db = xxdb

从节点重启MySQL:

shell> mysqladmin shutdown
shell> mysqld_safe --defaults-file=/data/mysqldata/3306/my.cnf &

4.主节点锁定后查看状态

主节点上锁:

mysql> FLUSH TABLES WITH READ LOCK;

主节点查看状态:

(root@localhost)[(none)]>  show master status
    -> ;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000011 |      432 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

5.从节点配置并启动同步、查看状态

从节点配置:

mysql> CHANGE MASTER TO
    MASTER_HOST='192.168.56.102',
    MASTER_USER='repl',
    MASTER_PASSWORD='asdfjkl',
    MASTER_LOG_FILE='mysql-bin.000011',
    MASTER_LOG_POS=432;

这里的日志文件和当前位置是根据上一步查到的主节点状态填写的。

启动SLAVE:

mysql> START SLAVE;

查看从节点状态:

mysql> show slave status \G

6.主节点解锁并验证从节点是否正常同步

主节点解锁:

mysql> UNLOCK TABLES;

主节点建库:

mysql> create database xxdb;

从节点查看是否同步:

mysql> show databases;
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