2020-07-01T14:34:42.709318Z 12 [ERROR] [MY-013117] [Repl] Slave I/O for channel ‘’: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it). Error_code: MY-013117
2020-07-01T14:34:42.709318Z 12 [ERROR] [MY-013117] [Repl] Slave I/O for channel '': Fatal error: The slave I/O thread stops because master and slave have equal MySQL server ids; these ids must be different for replication to work (or the --replicate-same-server-id option must be used on slave but this does not always make sense; please check the manual before using it). Error_code: MY-013117
這個報錯比較隱形，看着啓停都是成功SUCCESS，所以之前都忽略了警告，
[root@localhost data]# service mysql stop
my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
Shutting down MySQL.... SUCCESS!
[root@localhost data]# service mysql start
my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
Starting MySQL.my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
my_print_defaults: [Warning] World-writable config file '/etc/my.cnf' is ignored.
SUCCESS!
後面不管怎麼配置都沒有生效，所以想起來可能不能忽略，然後嘗試配置，更改權限後成功。
[root@localhost data]# ll /etc/my.cnf
-rwxrwxrwx. 1 root root 613 Jul 1 08:32 /etc/my.cnf
[root@localhost data]# chmod -R 755 /etc/my.cnf
[root@localhost data]# ll /etc/my.cnf
-rwxr-xr-x. 1 root root 613 Jul 1 08:32 /etc/my.cnf
[root@localhost data]# service mysql restart
Shutting down MySQL.. SUCCESS!
Starting MySQL.Logging to '/usr/local/mysql/data/mysql.log'.
SUCCESS!
沒有警告了，之前修改的server-id在重啓後也生效了