mysql雙主架構搭建

一、分配主機IP

1、第一臺主資料庫:192.168.154.93

2、第二臺主資料庫:192.168.154.94

二、修改主資料庫配置檔案

# cat /etc/my.cnf

[mysqld]

server-id=1

log-bin=mysql-bin

binlog-ignore-db=mysql,information_schema,performance_schema

auto_increment_offset=1

auto_increment_increment=2

# systemctl restart mysqld

三、在主資料庫中建立主從複製帳號（授權給從資料庫伺服器）

mysql> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO 'slave'@'%' IDENTIFIED BY 'root';

mysql> FLUSH PRIVILEGES;

四、查詢主資料庫狀態 （記錄下返回結果的File列和Position列的值）

mysql> SHOW MASTER STATUS\G

*************************** 1. row ***************************

File: mysql-bin.000002

Position: 418

Binlog_Do_DB:

Binlog_Ignore_DB: mysql,information_schema,performance_schema

Executed_Gtid_Set:

1 row in set (0.00 sec)

五、修改第二臺資料庫配置檔案

第二臺主資料庫:192.168.10.70

1.配置主機:192.168.10.70

（2）修改檔案

# vi /etc/my.cnf

[mysqld]

server_id=2

log-bin=mysql-bin

replicate-ignore-db=mysql,information_schema,performance_schema

binlog-ignore-db=mysql,information_schema,performance_schema

auto_increment_offset=2

auto_increment_increment=2

log-slave-updates

# systemctl restart mysqld

（3）建立使用者並授權

mysql> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO 'slave'@'%' IDENTIFIED BY 'root';

mysql> FLUSH PRIVILEGES;

3.檢視第一臺主資料庫的狀態

mysql> SHOW MASTER STATUS\G

*************************** 1. row ***************************

File: mysql-bin.000002

Position: 418

Binlog_Do_DB:

Binlog_Ignore_DB: mysql,information_schema,performance_schema

Executed_Gtid_Set:

1 row in set (0.00 sec)

4.在第二臺主資料庫上同步第一臺

mysql> STOP SLAVE;

mysql> change master to master_host='192.168.154.93',

master_user='slave',

master_password='root',

master_log_file='mysql-bin.000002',

master_log_pos=418,

master_connect_retry=30;

mysql> START SLAVE;

mysql> SHOW SLAVE STATUS\G

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

5.在第一臺主資料庫上同步第二臺

先檢視第二臺主資料庫狀態

mysql> SHOW MASTER STATUS\G

*************************** 1. row ***************************

File: mysql-bin.000001

Position: 428

Binlog_Do_DB:

Binlog_Ignore_DB: mysql,information_schema,performance_schema

Executed_Gtid_Set:

1 row in set (0.00 sec)

然後到第一臺主資料庫上操作如下：

mysql> STOP SLAVE;

mysql> change master to master_host='192.168.154.94',

master_user='slave',

master_password='root',

master_log_file='mysql-bin.000001',

master_log_pos=428,

master_connect_retry=30;

mysql> START SLAVE;

mysql> SHOW SLAVE STATUS\G

至此搭建完成。

報錯1：[ERROR] Slave I/O: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work. Error_code: 1593

解決方案：

[root@localhost ~]# systemctl stop mysqld

[root@localhost ~]# mv /var/lib/mysql/auto.cnf /var/lib/mysql/auto.cnf.bak

[root@localhost ~]# systemctl start mysqld.service