Mysql主从原理
准备环境
master 192.168.1.110 mysql Ver 8.0.23 for Linux on x86_64
slave 192.168.1.111 mysql Ver 8.0.23 for Linux on x86_64
master 设置
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| /etc/my.cnf
[mysqld]
## 同一局域网内注意要唯一
server-id=100
## 开启二进制日志功能，可以随便取（关键）
log-bin=mysql-bin
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重启mysql
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| systemctl restart msyqld
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创建slave用户
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| mysql> CREATE USER 'slave'@'%' IDENTIFIED BY 'zxc321';
##给予slave REPLICATION SLAVE，REPLICATION CLIENT权限用于主从数据库同步数据。
mysql> GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';
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查看master状态
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| mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000002 | 616 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
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由于安装的msyql版本为8.0的如果不进行下面配置会提示报错
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| 2021-03-06T13:05:02.551439Z 18 [ERROR] [MY-010584] [Repl] Slave I/O for channel '': error connecting to master 'slave@192.168.1.110:3306' - retry-time: 30 retries: 11 message: Authentication plugin 'caching_sha2_password' reported error: Authentication requires secure connection. Error_code: MY-002061
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我们将mysql master密码规则改为mysql_native_password
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| mysql> alter user 'slave'@'%' identified with mysql_native_password by 'zxc321';
flush privileges;
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slave设置
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| /etc/my.cnf
[mysqld]
## 设置server_id,注意要唯一
server-id=101
## 开启二进制日志功能，以备Slave作为其它Slave的Master时使用
log-bin=mysql-slave-bin
## relay_log配置中继日志
relay_log=edu-mysql-relay-bin
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重启mysql
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| systemctl restart msyqld
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进入mysql配置
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| mysql> change master to master_host='192.168.1.110', master_user='slave', master_password='zxc321', master_port=3306, master_log_file='mysql-bin.000002', master_log_pos= 616, master_connect_retry=30;
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slave命令
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| start slave 启动
stop slave 关闭
show slave status \G 查看
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| mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.1.110
Master_User: slave
Master_Port: 3306
Connect_Retry: 30
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 801
Relay_Log_File: edu-mysql-relay-bin.000002
Relay_Log_Pos: 509
Relay_Master_Log_File: mysql-bin.000002
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: 801
Relay_Log_Space: 722
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: 100
Master_UUID: 2a56788f-7e61-11eb-a92d-000c29d71937
Master_Info_File: mysql.slave_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:
Master_public_key_path:
Get_master_public_key: 0
Network_Namespace:
1 row in set, 1 warning (0.01 sec)
#以下两项都为Yes则说明主从已经开启
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
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测试
在master创建test数据库
