MySQL 一台从库的错误日志，大量报下面的错误信息
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2018-11-16 15:11:12 10951 [Note] Slave: received end packet from server, apparent master shutdown: 2018-11-16 15:11:12 10951 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysql-bin.000369' at position 255843250 2018-11-16 15:11:12 10951 [Warning] Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information. 2018-11-16 15:20:09 10951 [Note] Slave: received end packet from server, apparent master shutdown: 2018-11-16 15:20:09 10951 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysql-bin.000369' at position 276447773 2018-11-16 15:20:09 10951 [Warning] Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
这套DB有三台从库，而主库上面通过命令只能看到两台从库
root [(none)]> show slave hosts; +-----------+------+------+-----------+--------------------------------------+ | Server_id | Host | Port | Master_id | Slave_UUID | +-----------+------+------+-----------+--------------------------------------+ | 1373324 | | 3324 | 174144 | 5dfa3e4b-df15-11e8-8c37-06cbe47ccefb | | 174192 | | 3306 | 174144 | b24e27f0-dce5-11e8-bdf4-0cc47a397e1c | +-----------+------+------+-----------+--------------------------------------+ 2 rows in set (0.00 sec)
到缺少的那台从库上面检查server-id，看有没有和其他从库相同
server-id并不相同
mysql> show global variables like 'server%id%'; +----------------+--------------------------------------+ | Variable_name | Value | +----------------+--------------------------------------+ | server_id | 2461620 | | server_id_bits | 32 | | server_uuid | b24e27f0-dce5-11e8-bdf4-0cc47a397e1c | +----------------+--------------------------------------+ 3 rows in set (0.00 sec)
排除了server-id，还有可能是DB的uuid相同而导致从数据库注册不到主库。
删除数据库目录下面的server-id文件
# cd /disk1/mysql3320 # cat auto.cnf [auto] server-uuid=11478f92-e973-11e8-8fcf-0cc47a663554 # rm auto.cnf
之后重启问题从库，报错消失。