1、日志中出现 [ERROR] InnoDB: The Auto-extending innodb_system data file ‘./ibdata1‘ is of a different size 640 pages (rounded down to MB) than specified in the .cnf file: initial 768 pages, max 0 (relevant if non-zero) pages! 有类似错误
解决方案：在/etc/my.cnf 中修改或增加 innodb_data_file_path=ibdata1:10M:autoextend 计算方式：640页*16K/页 / 1024K/M = 10M
2、mysql.user table is damaged. Please run mysql_upgrade.
解决方案：删除data 目录下的所有东西，使用 mysqld –initialize –user=mysql 命令初始化系统，保证系统能正常启动。
3、mysql登录及密码修改
出现 error: ‘Access denied for user ‘root‘@‘localhost‘ (using password: YES)‘ 提示不能正常登录
解决方案：
安全启动mysql
mysqld_safe –user=mysql –skip-grant-tables –skip-networking &
mysql
mysql> update user set authentication_string=PASSWORD(‘root‘) where user=‘root‘;
Query OK, 1 row affected, 1 warning (0.04 sec)
Rows matched: 1 Changed: 1 Warnings: 1
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)
修改成功
重新启动mysql也成功
mysql登录后，提示修改密码
mysql> show databases;
ERROR 1820 (HY000): You must reset your password using ALTER USER statement before executing this statement.
mysql> set PASSWORD=Password(‘root‘);
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> alter user root@localhost PASSWORD EXPIRE NEVER;
Query OK, 0 rows affected (0.00 sec)
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.01 sec)
密码修改成功，密码也不提示过期了。