### 环境准备 系统: `CentOS7` 数据库: `MySQL5.7` Master节点: `172.16.0.100(node1)` Slave节点: `172.16.0.101(node2)`   ### 安装MySQL `Master/Slave节点` ```bash yum localinstall https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm yum install mysql-community-server ``` 启动数据库 ```bash systemctl enable mysqld systemctl start mysqld ``` 获取数据库临时密码 ```bash grep 'temporary password' /var/log/mysqld.log ``` 对数据库进行加固 ```bash mysql_secure_installation ```   ### 配置Master 修改数据库配置 ```bash vim /etc/my.cnf ``` ```ini bind-address = 172.16.0.100 server-id = 1 log_bin = mysql-bin ``` 重启数据库 ```bash systemctl restart mysqld ``` 创建复制账号 ```sql mysql> CREATE USER 'replica'@'172.16.0.101' IDENTIFIED BY 'strong_password'; mysql> GRANT REPLICATION SLAVE ON *.* TO 'replica'@'172.16.0.101'; mysql> FLUSH PRIVILEGES; ``` 查看二进制日志文件和位置 ```sql mysql> SHOW MASTER STATUS\G ``` ``` *************************** 1. row *************************** File: mysql-bin.000001 Position: 623 Binlog_Do_DB: Binlog_Ignore_DB: Executed_Gtid_Set: 1 row in set (0.00 sec) ``` `注意：文件:mysql-bin.000001,位置:623`   ### 配置Slave 修改数据库配置 ```bash vim /etc/my.cnf ``` ```ini bind-address = 172.16.0.101 server-id = 2 log_bin = mysql-bin ``` 重启数据库 ```bash systemctl restart mysqld ``` 停止slave线程 ```sql mysql> STOP SLAVE; ``` 配置slave复制master ```sql mysql> CHANGE MASTER TO mysql> MASTER_HOST='172.16.0.100', mysql> MASTER_USER='replica', mysql> MASTER_PASSWORD='strong_password', mysql> MASTER_LOG_FILE='mysql-bin.000001', mysql> MASTER_LOG_POS=623; ``` 启动slave线程 ```sql mysql> START SLAVE; ``` 查看slave状态 ```sql mysql >show slave status\G ``` ``` *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 172.16.0.100 Master_User: replica Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 1576 Relay_Log_File: node2-relay-bin.000002 Relay_Log_Pos: 1273 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: 1576 Relay_Log_Space: 1480 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: 1 Master_UUID: f8cc4c10-b429-11e9-9ff9-5600023106ec Master_Info_File: /var/lib/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: ``` ### 开启半同步复制 安装半同步复制插件 `Master` ```sql mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so'; #安装Master半同步复制插件 mysql> set global rpl_semi_sync_master_enabled=on; #开启Master半同步复制 mysql> show variables like '%semi%'; #查看半同步复制参数 mysql> show plugins; #查看加载的插件 ``` ``` ``` `Slave` ```sql mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so'; #安装Slave半同步复制插件 mysql> set global rpl_semi_sync_slave_enabled=on; #开启Slave半同步复制 mysql> show variables like '%semi%'; #查看半同步复制参数 mysql> show plugins; #查看加载的插件 ``` 重启IO线程 `Slave` ```sql mysql> stop slave io_thread; mysql> start slave io_thread; ``` 查看半同步复制信息 `Master` ```sql mysql> show global status like '%semi%'; ``` ``` +--------------------------------------------+-------+ | Variable_name | Value | +--------------------------------------------+-------+ | Rpl_semi_sync_master_clients | 1 | | Rpl_semi_sync_master_net_avg_wait_time | 0 | | Rpl_semi_sync_master_net_wait_time | 0 | | Rpl_semi_sync_master_net_waits | 0 | | Rpl_semi_sync_master_no_times | 0 | | Rpl_semi_sync_master_no_tx | 0 | | Rpl_semi_sync_master_status | ON | | Rpl_semi_sync_master_timefunc_failures | 0 | | Rpl_semi_sync_master_tx_avg_wait_time | 0 | | Rpl_semi_sync_master_tx_wait_time | 0 | | Rpl_semi_sync_master_tx_waits | 0 | | Rpl_semi_sync_master_wait_pos_backtraverse | 0 | | Rpl_semi_sync_master_wait_sessions | 0 | | Rpl_semi_sync_master_yes_tx | 0 | +--------------------------------------------+-------+ ``` `Rpl_semi_sync_master_no_tx`表示没有成功接收slave提交的事务 `Rpl_semi_sync_master_yes_tx`表示成功接收slave事务回复的次数 配置开机自启动半同步复制 `Master` ```bash vim /etc/my.cnf ``` ```ini rpl_semi_sync_master_enabled = on ``` `Slave` ```bash vim /etc/my.cnf ``` ```ini rpl_semi_sync_slave_enabled = on ```   ### 测试主从 `Master` ```sql mysql> CREATE DATABASE replicatest; ``` `Slave` ```sql mysql> show databases; ``` ``` +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | replicatest | | sys | +--------------------+ ``` `通过输出可以看到slave已经同步成功了!`