前言：
眼前兄弟们对“mysql跳过主从”大约比较重视，各位老铁们都想要知道一些“mysql跳过主从”的相关知识。那么小编也在网络上网罗了一些对于“mysql跳过主从””的相关文章，希望我们能喜欢，你们一起来学习一下吧！前述主从复制（也称AB复制)允许将来自一个MySQL数据库服务器（主服务器）的数据复制到一个或多个MySQL数据库服务器(从服务器)。复制是异步的从站不需要永久连接以接收来自主站的更新。工作原理master将改变记录到二进制日志(binary log)中(这些记录叫做二进制日志事件，binary log events)；slave将master的binary log events拷贝到它的中继日志(relay log)；slave重做中继日志中的事件，将改变反映它自己的数据。搭建主从复制
数据库的安装，可以参考这篇博文，默认已经安装好MySQL，且有两台服务器
1、Master 节点配置
[root@localhost ~]# vim /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，可以随意取(关键)log-bin=mysql-bin## 复制过滤：不需要备份的数据库，不输出(mysql库一般不同步)binlog-ignore-db=mysql## 为每个session分配的内存，在事务过程中用来存储二进制日志的缓存binlog_cache_size=1M## 主从复制的格式(mixed,statement,row，默认格式是statement)binlog_format=mixed复制代码2、slave节点配置
[root@localhost ~]# vim /etc/my.cnf[mysqld]## 同一局域网内注意要唯一server-id=102## 开启二进制日志功能，可以随意取(关键)log-bin=mysql-slave-bin## relay_log 配置中继日志relay_log=edu-mysql-relay-bin## 复制过滤：不需要备份的数据库，不输出(mysql库一般不同步)binlog-ignore-db=mysql## 如果需要同步函数或者存储过程log_bin_trust_function_creators=true## 为每个session分配的内存，在事务过程中用来存储二进制日志的缓存binlog_cache_size=1M## 主从复制的格式(mixed,statement,row，默认格式是statement)binlog_format=mixed##跳过主从复制中遇到的所有错误或指定类型的错误，避免slave端复制中断。##如:1062错误是指一些主键重复，1032错误是因为主从数据库数据不一致slave_skip_errors=1062复制代码3、重启MySQL
systemctl restart mysqld复制代码4、在master服务器授权slave服务器可以同步权限(master节点执行)
mysql > mysql -uroot -pmaster的密码# 授予slave服务器可以同步master服务mysql > grant replication slave,replication client on *.* to 'root'@'slave服务的ip' identified by 'slave服务器的密码';mysql > flush privileges;# 查看MySQL现在有哪些用户及对应的IP权限(可以不执行，只是一个查看)mysql > select user,host from mysql.user;# 5.7密码策略加强，可能会遇如下错误mysql> grant replication slave,replication client on *.* to 'root'@'115.236.38.120' identified by 'admin123';# ERROR 1819 (HY000): Your password does not satisfy the current policy requirementsmysql> set global validate_password_policy=0;Query OK, 0 rows affected (0.00 sec)mysql> set global validate_password_mixed_case_count=0;Query OK, 0 rows affected (0.00 sec)mysql> set global validate_password_number_count=3;Query OK, 0 rows affected (0.00 sec)mysql> set global validate_password_special_char_count=0;Query OK, 0 rows affected (0.00 sec)mysql> set global validate_password_length=3;Query OK, 0 rows affected (0.00 sec)mysql> grant replication slave,replication client on *.* to 'root'@'115.236.38.120' identified by 'admin123';Query OK, 0 rows affected, 1 warning (0.01 sec)复制代码5、查看MySQL现在有哪些用户及对应的IP权限
[root@localhost ~]# mysql -uroot -padmin123mysql> select user,host from mysql.user;+---------------+----------------+| user | host |+---------------+----------------+| root | % || root | 115.236.38.120 || mysql.session | localhost || mysql.sys | localhost || root | localhost |+---------------+----------------+5 rows in set (0.00 sec)6、查询master服务的binlog文件名和位置(master节点执行)
mysql> show master status;+------------------+----------+--------------+------------------+-------------------+| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |+------------------+----------+--------------+------------------+-------------------+| mysql-bin.000003 | 622 | | mysql | |+------------------+----------+--------------+------------------+-------------------+1 row in set (0.00 sec)7、slave进行关联master节点(slave节点执行)
这里注意一下 master_log_file和 master_log_pos 都是 master 服务器通过 show master status 获得。
命令
> change master to master_host='master服务器ip', master_user=' root ', master_password='master密码', master_port=3306,master_log_file='mysql-bin.000003',master_log_pos=622
mysql> change master to master_host='115.236.38.101', master_user='root', master_password='admin123', master_port=3306,master_log_file='mysql-bin.000003',master_log_pos=622;Query OK, 0 rows affected, 2 warnings (0.00 sec)mysql> start slave;Query OK, 0 rows affected (0.01 sec)mysql> show slave status\G;*************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 115.236.38.101 Master_User: root Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000005 Read_Master_Log_Pos: 154 Relay_Log_File: edu-mysql-relay-bin.000002 Relay_Log_Pos: 320 Relay_Master_Log_File: mysql-bin.000005 # 两个都为yes表示成功 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: 531 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: 0Master_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: 2b66e049-8ab0-11eb-8601-000c29e77dc3 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: 1 row in set (0.00 sec)ERROR: No query specified问题排查1、主从复制Connecting 问题网络不通检测IP、端口密码不对检查是否创建用于同步的用户和密码是否正确pos不对检查Master的 Postion2、MYSQL镜像服务器因错误停止的恢复—Slave_SQL_Running: No
> stop slave;> set global sql_slave_skip_counter=1;> start slave;> show slave status\G;3、从MYSQL服务器Slave_lO_Runnng: No的解决master节点执行，获取日志文件和post
> show master status;slave节点重新绑定
> stop slave;> change master to master_host='115.236.38.101', master_user='root', master_password='admin123', master_port=3306,master_log_file='mysql-bin.000003',master_log_pos=622;> start slave;
作者：吃猫的鱼_
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