mysql5.7.26做主从复制配置

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 |
+---------------+-----------+
4 rows in set (0.00 sec)

三、Master、Slave上分别设置不同的Server_id，主库上开启二进制日志

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。master上

server_id=103
log-bin=master
binlog_format=row

slave上

server_id=69

四、将主库做一次全量备份，并恢复到从库上

在主库上操作

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
5 rows in set (0.00 sec)

主库有一个test数据库

mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| test           |
+----------------+
1 row in set (0.00 sec)

有一个test表

mysql> select * from test;
+------+------+
| id   | name |
+------+------+
|    1 | aaaa |
+------+------+
1 row in set (0.00 sec)

表里有一条数据，开始备份主库

[root@node2 data]# mysqldump -uroot -p --all-databases > /home/mysql-5.7.26/bak/bak.sql
[root@node2 data]# scp -P25601 /home/mysql-5.7.26/bak/bak.sql root@172.28.18.69:/home/mysql-5.7.26/bak/

在从库上操作，恢复主库数据

[root@localhost log]# mysql -uroot -p < /home/mysql-5.7.26/bak/bak.sql 
Enter password: 
[root@localhost log]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.7.26 MySQL Community Server (GPL)

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
5 rows in set (0.00 sec)

mysql> 

此时，从库里test数据库有了，里面也有test数据表里记录

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| test               |
+--------------------+
5 rows in set (0.00 sec)

mysql> use test;
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 * from test
    -> ;
+------+------+
| id   | name |
+------+------+
|    1 | aaaa |
+------+------+
1 row in set (0.01 sec)

五、在slave上change msater 操作配置主从复制

首先获取主库日志文件名称和偏移量

mysql> show master status \G;
*************************** 1. row ***************************
             File: master.000001
         Position: 154
     Binlog_Do_DB: 
 Binlog_Ignore_DB: 
Executed_Gtid_Set: 
1 row in set (0.00 sec)

ERROR: 
No query specified

mysql> 

在从库上执行

mysql> change master to 
    -> master_host=‘172.28.18.103‘,
    -> master_port=3306,
    -> master_user=‘repl‘,
    -> master_password=‘Zaq1xsw@‘,
    -> master_log_file=‘master.000001‘,
    -> master_log_pos=154;
Query OK, 0 rows affected, 2 warnings (0.21 sec)

启动从库

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

查看从库状态

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.28.18.103
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master.000001
          Read_Master_Log_Pos: 154
               Relay_Log_File: localhost-relay-bin.000002
                Relay_Log_Pos: 317
        Relay_Master_Log_File: master.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: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 154
              Relay_Log_Space: 528
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File: 
           Master_SSL_CA_Path: 
              Master_SSL_Cert: 
            Master_SSL_Cipher: 
               Master_SSL_Key: 
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 103
                  Master_UUID: ddbee8c3-76da-11e9-9174-90b11c15be09
             Master_Info_File: /home/mysql-5.7.26/data/master.info

此时:

Slave_IO_Running: Yes
Slave_SQL_Running: Yes

主从复制配置已经生效

六、测试数据

在主库插入一条数据

mysql> insert test values(2,‘bbbb‘);
Query OK, 1 row affected (0.03 sec)

从库上查询

mysql> select * from test;
+------+------+
| id   | name |
+------+------+
|    1 | aaaa |
|    2 | bbbb |
+------+------+
2 rows in set (0.00 sec)

数据已经复制成功了。

mysql5.7.26做主从复制配置

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