MySQL初始化问题
shell> mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
shell> service mysqld restart
Stopping mysqld: [ OK ]
MySQL Daemon failed to start.
Starting mysqld: [FAILED]
#日志中报错如下：
[ERROR] Fatal error: mysql.user table is damaged. Please run mysql_upgrade.
[ERROR] Aborting
#这种情况本人是在MySQL5.1到5.7版本升级时遇到的，升级到5.7后，数据库启动失败
#解决的办法就是重新初始化数据库
shell> rm -fr /var/lib/mysql
shell> mysqld --initialize --user=mysql
shell> service mysqld restart
Stopping mysqld: [ OK ]
Starting mysqld: [ OK ]
