mysql5.7.26做主主配置

一、首先两台服务器安装好mysql数据库环境

参照linux rpm方式安装mysql5.1

https://www.cnblogs.com/sky-cheng/p/10564604.html

二、在两台mysql上都创建复制账号

mysql> grant replication slave,replication client on *.* to 'repl'@'%' identified by 'Zaq1xsw@';
Query OK,  rows affected,  warning (0.00 sec)
mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select user,host from user;
+---------------+-----------+
| user          | host      |
+---------------+-----------+
| repl          | %         |
| root          | %         |
| mysql.session | localhost |
| mysql.sys     | localhost |
+---------------+-----------+
 rows in set (0.00 sec)

三、两台mysql服务器上上分别设置不同的Server_id，同时都开启二进制日志

mysql> show variables like '%server_id%';
+----------------+-------+
| Variable_name  | Value |
+----------------+-------+
| server_id      | 0     |
| server_id_bits | 32    |
+----------------+-------+

如果配置文件没有设置server_id参数，则默认都是0

编辑/etc/my.cnf

添加service_id,它的值可以跟服务器的IP最后一位数字一样，这样就能保证内网中的服务器ID不重复。一台设置

server_id=103
log-bin=master
binlog_format=row

另一台

server_id=
log-bin=master-
binlog_format=row

四、重启两台服务器的mysql服务

五、两台服务器分别执行change master操作

首先获取第一台数据库日志文件名称和偏移量：

mysql> show master status\G;
*************************** . row ***************************
             File: master-1.000001
         Position:
     Binlog_Do_DB:
 Binlog_Ignore_DB:
Executed_Gtid_Set:
 row in set (0.00 sec)

ERROR:
No query specified

在另外一台上执行

mysql> change master
    -> to
    -> master_host='172.28.18.69',
    -> master_port=,
    -> master_user='repl',
    -> master_password='xxxxxxxxx',
    -> master_log_file='master-1.000001',
    -> master_log_pos=;
Query OK,  rows affected,  warnings (0.20 sec)

开启这台上的主从复制

mysql> start slave;
Query OK,  rows affected (0.01 sec)

查看从库状态

mysql> show slave status\G
*************************** . row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.28.18.69
                  Master_User: repl
                  Master_Port:
                Connect_Retry:
              Master_Log_File: master-1.000001
          Read_Master_Log_Pos:
               Relay_Log_File: node2-relay-bin.
                Relay_Log_Pos:
        Relay_Master_Log_File: master-1.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno:
                   Last_Error:
                 Skip_Counter:
          Exec_Master_Log_Pos:
              Relay_Log_Space:
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos:
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master:
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno:
                Last_IO_Error:
               Last_SQL_Errno:
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id:
                  Master_UUID: c76bbd08-7acd-11e9-badd-14feb5dc2c77
             Master_Info_File: /home/mysql-5.7./data/master.info
                    SQL_Delay:
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count:
                  Master_Bind: 

Slave_IO_Running: Yes
Slave_SQL_Running: Yes从库同步线程启动成功，同样在另外一台服务器上也执行上述的操作，实际上主主配置就是互为主从配置。配置完后，在两台服务器上都可以查看主库和从库的状态

六、测试数据
在其中一台上插入数据，另外一台立即可以同步数据，表示配置成功。
首先在两台服务器上分别执行查询，看看表里数据是否一致

mysql> select * from test;
+------+------+
| id   | name |
+------+------+
|     | aaaa |
|     | bbbb |
|     | ccc  |
+------+------+
 rows in set (0.00 sec)

mysql> select * from test;
+------+------+
| id   | name |
+------+------+
|     | aaaa |
|     | bbbb |
|     | ccc  |
+------+------+

两台服务器数据一致，在其中一台插入数据

mysql> insert into test values(,'dddd');
Query OK,  row affected (0.03 sec)

mysql> select * from test;
+------+------+
| id   | name |
+------+------+
|     | aaaa |
|     | bbbb |
|     | ccc  |
|     | dddd |
+------+------+
 rows in set (0.00 sec)

另外一台查询

mysql> select * from test;
+------+------+
| id   | name |
+------+------+
|     | aaaa |
|     | bbbb |
|     | ccc  |
|     | dddd |
+------+------+
 rows in set (0.00 sec)

插入的数据已经同步了

再在这台服务器上插入数据

mysql> insert into test values(,'eeee');
Query OK,  row affected (0.02 sec)

mysql> select * form test
    -> ;
ERROR  (): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'form test' at line
mysql> select * from test;
+------+------+
| id   | name |
+------+------+
|     | aaaa |
|     | bbbb |
|     | ccc  |
|     | dddd |
|     | eeee |
+------+------+
 rows in set (0.00 sec)

在另外一台查询

mysql> select * from test;
+------+------+
| id   | name |
+------+------+
|     | aaaa |
|     | bbbb |
|     | ccc  |
|     | dddd |
|     | eeee |
+------+------+
 rows in set (0.00 sec)

数据同步了，至此mysql主主配置成功。