小记一次mysql启动失败没有日志的处理

本来mysql好的，之前清理了一次tmp下的东西，mysql在查询的时候提示：

Can't create/write to file '/tmp/ib0n3frL

然后停止启动：

[root@sevck_linux mysql]# service mysqld start
MySQL Daemon failed to start.
Starting mysqld: [FAILED]

启动失败了，看一下日志，发现配置的时候没添加日志配置

查找my.cnf,在[mysqld]下添加log-error=/var/log/mysql/mysql-error.log

配置mysql的错误日志，mysql目录自行设置，其中记住一点，chown -R mysql:mysql /tmp/mysql

赋予mysql目录权限，因为我是root, mysql运行权限为mysql，没有权限

再启动mysql尝试：

 :: InnoDB: Mutexes and rw_locks use GCC atomic builtins
 :: InnoDB: Compressed tables use zlib 1.2.
 :: InnoDB: Using Linux native AIO
^G/usr/libexec/mysqld: Can't create/write to file '/tmp/mysql_data/ibAGn543' (Errcode: 13)
 ::  InnoDB: Error: unable to create temporary file; errno:
 :: [ERROR] Plugin 'InnoDB' init function returned error.
 :: [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
 :: [ERROR] Unknown/unsupported storage engine: InnoDB
 :: [ERROR] Aborting

 :: [Note] /usr/libexec/mysqld: Shutdown complete

原来是Can't create/write to file，那么就好解决了，看看mysql_data目录是否存在。

chmod  -R 777 /tmp

赋予写的权限，启动mysql:

root@sevck_linux mysql]# service mysqld start
Starting mysqld:                                           [  OK  ]

just do it.