MySQL启动失败 找不到原因 后来查询
/var/lib/mysql目录下的localhost.localdomain.err文件
出现错误是
[root@localhost local]# service mysql start 160704 15:57:28 [ERROR] /usr/sbin/mysqld: Can't find file: './mysql/host.frm' (errno: 13) 160704 15:57:28 [ERROR] Fatal error: Can't open and lock privilege tables: Can't find file: './mysql/host.frm' (errno: 13) 160704 15:57:28 mysqld_safe mysqld from pid file /var/lib/mysql/localhost.localdomain.pid ended
后经在/etc/my.cnf文件中datadir目录权限是否正确
于是修改了权限，就可以成功启动
[root@localhost local]# service mysql start Starting MySQL.. [确定]
第二:
http://www.linuxidc.com/Linux/2013-03/81340.htm
第三:
非正常关闭mysql，同时更改了my.cnf 导致启动时不支持innodb，出现如下错误：
[ERROR] Plugin ‘InnoDB’ init function returned error.
[ERROR] Plugin ‘InnoDB’ registration as a STORAGE ENGINE failed.
[ERROR] Unknown/unsupported table type: InnoDB
[ERROR] Aborting
解决办法：
删除log(/var/lib/mysql/ibdata1)文件和data(/var/lib/mysql/ib_logfile0或ib_logfile1)的初始化文件
重新运行mysql_install_db
再启动
第四:
mysql报错Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
今天在安装mysql后，启动时候没有启动成功，查看了下日志报错如下:
---------------------------------------------
[root@localhost local]# less /var/log/mysqld.log
1、查看报错信息如下:
[ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
2、经过查阅资料得知。要敲如下命令解决:
mysql_install_db –usrer=mysql datadir=/var/lib/mysql
datadir是我的mysql存放文件目录
3、然后重启mysql还是不行:
MySQL Daemon failed to start.
正在启动 mysqld： [失败]
4、然后试了下单独的命令，启动完成
mysql_install_db
5、启动mysql服务
[root@mysql mysqld]# /etc/init.d/mysqld restart
停止 mysqld： [确定]
正在启动 mysqld： [确定]
