一、如果版本不一样请执行以下操作：

MySQL 跨版本主从复制时报错：ERROR 1794 (HY000): Slave is not configured or failed to initialize properly.

背景： zabbix 数据库迁移，搭建主从，主是5.6.25，从是5.7.15，流式备份应用 redo.log 之后，change master 和reset slave 时报出如下错误

mysql> CHANGE MASTER TO->   MASTER_HOST=‘192.168.40.129‘,->   MASTER_USER=‘repl‘,->   MASTER_PASSWORD=‘repl_123‘,->   MASTER_PORT=3306,->   MASTER_LOG_FILE=‘mysql-bin.000005‘,       ->   MASTER_LOG_POS=749,->   MASTER_AUTO_POSITION=0;
ERROR 1794 (HY000): Slave is not configured or failed to initialize properly. You must at least set --server-id to enable either a master or a slave. Additional error messages can be found in the MySQL error log.

原因：从 5.6.25 版本使用 innobackupex 备份，在 5.7.15 版本中应用恢复，ibd系统表需要重建

解决步骤：

1、drop 备份的 ibd表

#登录数据库
mysql -uroot -p
#使用mysql数据库
use mysql;
#删除
drop table slave_master_info;
drop table slave_relay_log_info;
drop table slave_worker_info;
drop table innodb_index_stats;
drop table innodb_table_stats;
#重建
source /app/mysql-5.7.25/share/mysql_system_tables.sql
#退出mysql
quit
#重启mysql
/etc/init.d/mysqld restart
或者service mysqld restart
注：这里根据自己的mysql路径进行修改即可

至此，问题解决，登陆数据库，重新 change master to 即可！

二、如果版本一样，请执行以下操作

2.1. 编辑/etc/my.cnf

vi /etc/my.cnf

2.2. 添加如下2行代码

log-bin=mysql-bin
server-id=2

2.3. 重启mysql

#重启mysql
/etc/init.d/mysqld restart
或者service mysqld restart
注：这里根据自己的mysql路径进行修改即可

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Slave is not configured or failed to initialize properly. You must at least set --server-id

一、如果版本不一样请执行以下操作：

二、如果版本一样，请执行以下操作

2.1. 编辑/etc/my.cnf

2.2. 添加如下2行代码

2.3. 重启mysql

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