180720 10:00:54 [ERROR] Can‘t open the mysql.plugin table. Please run mysql_upgrade to create it. 180720 10:00:54 InnoDB: Initializing buffer pool, size = 8.0M 180720 10:00:54 InnoDB: Completed initialization of buffer pool InnoDB: Error: log file ./ib_logfile0 is of different size 0 5242881 bytes InnoDB: than specified in the .cnf file 0 5242880 bytes! 180720 10:00:54 [ERROR] Plugin ‘InnoDB‘ init function returned error. 180720 10:00:54 [ERROR] Plugin ‘InnoDB‘ registration as a STORAGE ENGINE failed. 180720 10:00:54 [ERROR] Fatal error: Can‘t open and lock privilege tables: Table ‘mysql.host‘
1.解决：mysql_install_db --user=mysql --basedir=/usr/ --ldata=/var/lib/mysql/
2.查看分析错误
vim /var/lib/mysql/instance-ggicik0l.err
mysql中mysql数据库丢失报错Can't open the mysql.plugin table
原文：https://www.cnblogs.com/weizaiyes/p/11502544.html