mysql启动不起来

在刚编译安装完成mysql，启动mysql时报了下面错误：

/etc/init.d/mysqld start
Starting MySQL... ERROR! The server quit without updating PID file (/application/mysql-5.6./data/ZabbixServer.pid).

显示是没有mysq的pid文件

创建之后还是启动不起来，报上述错误。

查看mysql错误日志：

-- ::  [Note] Plugin 'FEDERATED' is disabled.
-- ::  [Note] InnoDB: Using atomics to ref count buffer pool pages
-- ::  [Note] InnoDB: The InnoDB memory heap is disabled
-- ::  [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
-- ::  [Note] InnoDB: Memory barrier is not used
-- ::  [Note] InnoDB: Compressed tables use zlib 1.2.
-- ::  [Note] InnoDB: Using Linux native AIO
-- ::  [Note] InnoDB: Using CPU crc32 instructions
-- ::  [Note] InnoDB: Initializing buffer pool, size = 128.0M
-- ::  [Note] InnoDB: Completed initialization of buffer pool
-- :: 2524 [Note] InnoDB: Highest supported file format is Barracuda.
-- ::  [Note] InnoDB:  rollback segment(s) are active.
-- ::  [Note] InnoDB: Waiting for purge to start
-- ::  [Note] InnoDB: 5.6. started; log sequence number
-- ::  [Note] Server hostname (bind-address): '*'; port:
-- ::  [Note] IPv6 is available.
-- ::  [Note]   - '::' resolves to '::';
-- ::  [Note] Server socket created on IP: '::'.
-- ::  [ERROR] Can't start server : Bind on unix socket: Permission denie
d
-- ::  [ERROR] Do you already have another mysqld server running on socke
t: /application/mysql-5.6./tmp/mysql.sock ?
-- ::  [ERROR] Aborting

socket套接字没有权限；那就加上权限chmod 777 tmp

重启：/etc/init.d/mysqld start

Starting MySQL. SUCCESS!

启动成功，

提示：遇到错误，首先要学会看报错日志，判断问题出现在什么地方，然后再上网查阅解决办法。