在剛編譯安裝完成mysql，啟動mysql時報了下面錯誤：
/etc/init.d/mysqld start Starting MySQL... ERROR! The server quit without updating PID file (/application/mysql-5.6.40/data/ZabbixServer.pid).
顯示是沒有mysq的pid文件
創建之后還是啟動不起來，報上述錯誤。
查看mysql錯誤日志：
2018-09-14 08:28:25 2524 [Note] Plugin 'FEDERATED' is disabled. 2018-09-14 08:28:25 2524 [Note] InnoDB: Using atomics to ref count buffer pool pages 2018-09-14 08:28:25 2524 [Note] InnoDB: The InnoDB memory heap is disabled 2018-09-14 08:28:25 2524 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins 2018-09-14 08:28:25 2524 [Note] InnoDB: Memory barrier is not used 2018-09-14 08:28:25 2524 [Note] InnoDB: Compressed tables use zlib 1.2.3 2018-09-14 08:28:25 2524 [Note] InnoDB: Using Linux native AIO 2018-09-14 08:28:25 2524 [Note] InnoDB: Using CPU crc32 instructions 2018-09-14 08:28:25 2524 [Note] InnoDB: Initializing buffer pool, size = 128.0M 2018-09-14 08:28:25 2524 [Note] InnoDB: Completed initialization of buffer pool 2018-09-14 08:28:25 2524 [Note] InnoDB: Highest supported file format is Barracuda. 2018-09-14 08:28:25 2524 [Note] InnoDB: 128 rollback segment(s) are active. 2018-09-14 08:28:25 2524 [Note] InnoDB: Waiting for purge to start 2018-09-14 08:28:25 2524 [Note] InnoDB: 5.6.40 started; log sequence number 1626087 2018-09-14 08:28:25 2524 [Note] Server hostname (bind-address): '*'; port: 3306 2018-09-14 08:28:25 2524 [Note] IPv6 is available. 2018-09-14 08:28:25 2524 [Note] - '::' resolves to '::'; 2018-09-14 08:28:25 2524 [Note] Server socket created on IP: '::'. 2018-09-14 08:28:25 2524 [ERROR] Can't start server : Bind on unix socket: Permission denie d 2018-09-14 08:28:25 2524 [ERROR] Do you already have another mysqld server running on socke t: /application/mysql-5.6.40/tmp/mysql.sock ? 2018-09-14 08:28:25 2524 [ERROR] Aborting
socket套接字沒有權限；那就加上權限chmod 777 tmp
重啟：/etc/init.d/mysqld start
Starting MySQL. SUCCESS!
啟動成功，
提示：遇到錯誤，首先要學會看報錯日志，判斷問題出現在什么地方，然后再上網查閱解決辦法。