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Linux-MySQL-主主复制

作者：互联网

主主复制

主主复制：两个节点，都可以更新数据，并且互为主从

容易产生的问题：数据不一致；因此慎用

考虑要点：自动增长id

配置一个节点使用奇数id

auto_increment_offset=1   #开始点
auto_increment_increment=2 #增长幅度

另一个节点使用偶数id

auto_increment_offset=2
auto_increment_increment=2

主主复制的配置步骤：

  1. 各节点使用一个惟一server_id
  2. 都启动binary log和relay log
  3. 创建拥有复制权限的用户账号
  4. 定义自动增长id字段的数值范围各为奇偶
  5. 均把对方指定为主节点，并启动复制线程

实现两个节点主主复制模型

实验环境

机器

centos7       地址10.0.0.7      

centso7　　地址10.0.0.77    

已安装MySQL5.7数据库

第一个master1主节点

创建日志路径

[root@centos7-liyj ~]#mkdir -p /data/mysql/logbin
[root@centos7-liyj ~]#chown -R mysql.mysql /data/mysql/

配置文件添加

[root@centos7-liyj ~]#vim /etc/my.cnf
[root@centos7-liyj ~]#cat /etc/my.cnf
[mysqld]
datadir=/data/mysql
skip_name_resolve=1
socket=/data/mysql/mysql.sock        
log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid

server-id=7                             #全局唯一ID编号
log-bin=/data/mysql/logbin/mysql-bin　　 #二进制日志路径
auto_increment_offset=1　　　　　　　　　　 #开始点
auto_increment_increment=2　　　　　　　　 #增长幅度

[client]
socket=/data/mysql/mysql.sock

重启数据库服务

[root@centos7-liyj ~]#systemctl restart mysqld

记录二进制日志位置

[root@centos7-liyj ~]#mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.37-log Source distribution

Copyright (c) 2000, 2022, Oracle and/or its affiliates.

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  master logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       154 |
+------------------+-----------+
1 row in set (0.00 sec)

创建复制用户并授权

mysql> create user repluser"10.0.0.%" identified by "123456";

mysql> grant replication slave on *.* to repluser@"10.0.0.%";

 

第二个master2主节点

创建日志路径

[root@centos7-liyj ~]#mkdir -p /data/mysql/logbin
[root@centos7-liyj ~]#chown -R mysql.mysql /data/mysql/

 配置文件

[root@centos7-liyj ~]#vim /etc/my.cnf
[root@centos7-liyj ~]#cat /etc/my.cnf
[mysqld]
datadir=/data/mysql
skip_name_resolve=1
socket=/data/mysql/mysql.sock        
log-error=/data/mysql/mysql.log
pid-file=/data/mysql/mysql.pid

server-id=77                              #全局唯一ID编号
log-bin=/data/mysql/logbin/mysql-bin       #二进制日志路径
auto_increment_offset=2　　　　　　　　　　　 #开始点
auto_increment_increment=2　　　　　　　　　 #增长幅度

[client]
socket=/data/mysql/mysql.sock

重启数据库服务

[root@centos7-liyj ~]#systemctl restart mysqld

登录数据库配置 复制同步

mysql> CHANGE MASTER TO
    -> MASTER_HOST='10.0.0.7',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='123456',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='mysql-bin.000001',
    -> MASTER_LOG_POS=154;
Query OK, 0 rows affected, 2 warnings (0.00 sec)

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)

mysql> show master logs;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       154 |
+------------------+-----------+
1 row in set (0.00 sec)

开启复制

mysql> start slave;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.7
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 627
               Relay_Log_File: centos7-liyj-relay-bin.000002
                Relay_Log_Pos: 793
        Relay_Master_Log_File: mysql-bin.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: 627
              Relay_Log_Space: 1007
              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: 7
                  Master_UUID: 6eba5dd5-d036-11ec-80f9-0050563aaca0
             Master_Info_File: /data/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)
从节点状态信息

 

在第一个master节点上

mysql> CHANGE MASTER TO
    -> MASTER_HOST='10.0.0.77',
    -> MASTER_USER='repluser',
    -> MASTER_PASSWORD='123456',
    -> MASTER_PORT=3306,
    -> MASTER_LOG_FILE='mysql-bin.000001',
    -> MASTER_LOG_POS=154;
Query OK, 0 rows affected, 2 warnings (0.00 sec)

开启复制

mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 10.0.0.77
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 154
               Relay_Log_File: centos7-liyj-relay-bin.000002
                Relay_Log_Pos: 320
        Relay_Master_Log_File: mysql-bin.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: 534
              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: 77
                  Master_UUID: 8d1ce2f2-d008-11ec-8556-005056399ee0
             Master_Info_File: /data/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
1 row in set (0.00 sec)

ERROR: 
No query specified
主节点状态信息

测试

第一节点master1创建数据库
mysql> create database school;
Query OK, 1 row affected (0.00 sec)

第二节点master2查看

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| logbin |
| mysql |
| performance_schema |
| school |
| sys |
+--------------------+
6 rows in set (0.00 sec)

第二节点master2创建表

mysql> use school;
Database changed
mysql> create table student (
    -> id int UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    -> name VARCHAR(20) NOT NULL,
    -> age tinyint UNSIGNED,
    -> gender ENUM('M','F') default 'M'
    -> )ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.03 sec)

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

mysql> desc student;
+--------+---------------------+------+-----+---------+----------------+
| Field  | Type                | Null | Key | Default | Extra          |
+--------+---------------------+------+-----+---------+----------------+
| id     | int(10) unsigned    | NO   | PRI | NULL    | auto_increment |
| name   | varchar(20)         | NO   |     | NULL    |                |
| age    | tinyint(3) unsigned | YES  |     | NULL    |                |
| gender | enum('M','F')       | YES  |     | M       |                |
+--------+---------------------+------+-----+---------+----------------+
4 rows in set (0.02 sec)

第一节点master1查看
mysql> use school
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> show tables ;
+------------------+
| Tables_in_school |
+------------------+
| student          |
+------------------+
1 row in set (0.00 sec)

mysql> desc student;
+--------+---------------------+------+-----+---------+----------------+
| Field  | Type                | Null | Key | Default | Extra          |
+--------+---------------------+------+-----+---------+----------------+
| id     | int(10) unsigned    | NO   | PRI | NULL    | auto_increment |
| name   | varchar(20)         | NO   |     | NULL    |                |
| age    | tinyint(3) unsigned | YES  |     | NULL    |                |
| gender | enum('M','F')       | YES  |     | M       |                |
+--------+---------------------+------+-----+---------+----------------+
4 rows in set (0.00 sec)

 

标签：Log,主主,mysql,SSL,Master,Linux,MySQL,sec,data
来源： https://www.cnblogs.com/lyj1023/p/16270856.html