mysql8.0.27基于二进制文件的主从复制

首先准备两台服务器（或两个mysql）一个主一个从

• 192.168.2.161
• 192.168.2.162

mysql> select version();
+-------------------------+
| version()               |
+-------------------------+
| 8.0.27-0ubuntu0.20.04.1 |
+-------------------------+
1 row in set (0.00 sec)

1.配置服务器server_id

主服务器

server-id               = 1

从服务器

server-id               = 2

2.主mysql 创建复制用户

mysql> CREATE USER 'repl2'@'%' IDENTIFIED BY 'repl2';
Query OK, 0 rows affected (0.00 sec)

mysql> GRANT REPLICATION SLAVE ON *.* TO 'repl2'@'%';
Query OK, 0 rows affected (0.01 sec)

如果需要修改用户密码加密方式，也可以在创建用户时使用WITH mysql_native_password

mysql> ALTER USER 'repl2'@'%' IDENTIFIED WITH mysql_native_password BY 'repl2';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.01 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 Host,User,plugin from user;
+-------------+------------------+-----------------------+
| Host        | User             | plugin                |
+-------------+------------------+-----------------------+
| %           | repl1            | caching_sha2_password |
| %           | root             | mysql_native_password |
| 192.168.2.* | repl2            | mysql_native_password |
| localhost   | debian-sys-maint | caching_sha2_password |
| localhost   | mysql.infoschema | caching_sha2_password |
| localhost   | mysql.session    | caching_sha2_password |
| localhost   | mysql.sys        | caching_sha2_password |
+-------------+------------------+-----------------------+
7 rows in set (0.00 sec)

3. 获取复制源二进制日志坐标

主节点执行 加锁

mysql> FLUSH TABLES WITH READ LOCK;
Query OK, 0 rows affected (0.00 sec)

mysql>  SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+------------------------------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set                        |
+------------------+----------+--------------+------------------+------------------------------------------+
| mysql-bin.000006 |      196 |              |                  | cfcb5034-5ca9-11ec-8b10-0800275be603:2-3 |
+------------------+----------+--------------+------------------+------------------------------------------+
1 row in set (0.00 sec)

4.备份主节点

root@mysql-master:/etc/mysql# mysqldump -uroot -p --all-databases --master-data > dbdump.db
Enter password:

释放锁
```bash
mysql> UNLOCK TABLES;
Query OK, 0 rows affected (0.00 sec)

将备份数据拷贝到从节点，然后导入数据库

root@mysql-master:/etc/mysql# mysql -uroot -p  < dbdump.sql
Enter password:

5.设置从节点

在 MySQL 8.0.23 之前

mysql> CHANGE MASTER TO
    ->     MASTER_HOST='source_host_name',
    ->     MASTER_USER='replication_user_name',
    ->     MASTER_PASSWORD='replication_password',
    ->     MASTER_LOG_FILE='recorded_log_file_name',
    ->     MASTER_LOG_POS=recorded_log_position;

8.0.23之后

mysql> CHANGE REPLICATION SOURCE TO
    ->     SOURCE_HOST='source_host_name',
    ->     SOURCE_USER='replication_user_name',
    ->     SOURCE_PASSWORD='replication_password',
    ->     SOURCE_LOG_FILE='recorded_log_file_name',
    ->     SOURCE_LOG_POS=recorded_log_position;

CHANGE REPLICATION SOURCE TO SOURCE_HOST='192.168.2.161', SOURCE_USER='repl2', SOURCE_PASSWORD='repl2', SOURCE_LOG_FILE='mysql-bin.000006', SOURCE_LOG_POS=196 ;

从节点开始复制

mysql> start replica;
Query OK, 0 rows affected, 1 warning (0.00 sec)

查看复制状态

mysql> start replica;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> SHOW REPLICA STATUS\G
*************************** 1. row ***************************
             Replica_IO_State: Waiting for source to send event
                  Source_Host: 192.168.2.161
                  Source_User: repl3
                  Source_Port: 3306
                Connect_Retry: 60
              Source_Log_File: mysql-bin.000006
          Read_Source_Log_Pos: 2534
               Relay_Log_File: mysql-node1-relay-bin.000003
                Relay_Log_Pos: 324
        Relay_Source_Log_File: mysql-bin.000006
           Replica_IO_Running: Yes
          Replica_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_Source_Log_Pos: 2534
              Relay_Log_Space: 3045
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Source_SSL_Allowed: No
           Source_SSL_CA_File:
           Source_SSL_CA_Path:
              Source_SSL_Cert:
            Source_SSL_Cipher:
               Source_SSL_Key:
        Seconds_Behind_Source: 0
Source_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Source_Server_Id: 1
                  Source_UUID: af1ff730-5e42-11ec-8ec1-0800275be603
             Source_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
    Replica_SQL_Running_State: Replica has read all relay log; waiting for more updates
           Source_Retry_Count: 86400
                  Source_Bind:
      Last_IO_Error_Timestamp:
     Last_SQL_Error_Timestamp:
               Source_SSL_Crl:
           Source_SSL_Crlpath:
           Retrieved_Gtid_Set:
            Executed_Gtid_Set:
                Auto_Position: 0
         Replicate_Rewrite_DB:
                 Channel_Name:
           Source_TLS_Version:
       Source_public_key_path:
        Get_Source_public_key: 0
            Network_Namespace:
1 row in set (0.00 sec)

成功！