MySQL主从复制杂记

Posted 2020-10-27

mysql主从复制架构及实现

主从配置

0、master1为主，master2为从节点

1、开启主节点的二进制日志、serverID

[[email protected] ~]# vim /etc/my.cnf
[mysqld]

log_bin=master-bin
server-id=1
innodb-file-per-table=ON
skip_name_resolve=ON

systemctl start mariadb.service

MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE ‘%log%‘;
| log_bin                                   | ON      

MariaDB [(none)]> SHOW MASTER LOGS;
+------------------+-----------+
| Log_name         | File_size |
+------------------+-----------+
| mysql-bin.000001 |       264 |
| mysql-bin.000002 |       264 |
| mysql-bin.000003 |       264 |
| mysql-bin.000004 |       245 |
+------------------+-----------+

MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE ‘%server%‘;
+----------------------+-------------------+
| Variable_name        | Value             |
+----------------------+-------------------+
| character_set_server | latin1            |
| collation_server     | latin1_swedish_ci |
| server_id            | 1                 |
+----------------------+-------------------+

2、主节点创建一个有写权限的账户

MariaDB [(none)]> GRANT REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO ‘repluser‘@‘10.201.106.%‘ IDENTIFIED BY ‘replpass‘;
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

3、从节点配置开启中继日志，创建唯一ID号

[mysqld]

innodb_file_per_table=ON
relay-log=relay-log
relay-log-index=relay-log.index
server-id=7
skip_name_resolve=ON

MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE ‘%log%‘;
| relay_log                                 | relay-log

MariaDB [(none)]> SHOW GLOBAL VARIABLES LIKE ‘%server%‘;
+----------------------+-------------------+
| Variable_name        | Value             |
+----------------------+-------------------+
| character_set_server | latin1            |
| collation_server     | latin1_swedish_ci |
| server_id            | 7                 |
+----------------------+-------------------+

4、从节点连接主服务器，并启用复制线程

MariaDB [(none)]> CHANGE MASTER TO MASTER_HOST=‘10.201.106.131‘,MASTER_USER=‘repluser‘,MASTER_PASSWORD=‘replpass‘,MASTER_LOG_FILE=‘master-bin.000003‘,MASTER_LOG_POS=498;

MariaDB [(none)]> SHOW SLAVE STATUS\G
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: 10.201.106.131
                  Master_User: repluser
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: master-bin.000003
          Read_Master_Log_Pos: 498
               Relay_Log_File: relay-log.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: master-bin.000003
             Slave_IO_Running: No
            Slave_SQL_Running: No
              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: 498
              Relay_Log_Space: 245
              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: NULL
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: 0
1 row in set (0.05 sec)

启动复制线程：
MariaDB [(none)]> START SLAVE;

5、验证同步

MariaDB [(none)]> CREATE DATABASE mydb;
MariaDB [(none)]> SHOW MASTER STATUS;
+-------------------+----------+--------------+------------------+
| File              | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-bin.000003 |     1087 |              |                  |
+-------------------+----------+--------------+------------------+

从节点：
MariaDB [(none)]> SHOW SLAVE STATUS\G
1. row
Slave_IO_State: Waiting for master to send event
Master_Host: 10.201.106.131
Master_User: repluser
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000003
Read_Master_Log_Pos: 1087