The server quit without updating PID file

[root@fjgh ~]# service mysqld start
Starting MySQL... ERROR! The server quit without updating PID file (/usr/local/mysql-5.5.62/data/fjgh.pid).

　　

查看日志文件 /usr/local/mysql-5.5.62/data/fjgh.err

  :: [Note] Plugin 'FEDERATED' is disabled.
  :: InnoDB: The InnoDB memory heap is disabled
  :: InnoDB: Mutexes and rw_locks use GCC atomic builtins
  :: InnoDB: Compressed tables use zlib 1.2.
  :: InnoDB: Using Linux native AIO
  :: InnoDB: Initializing buffer pool, size = 128.0M
  :: InnoDB: Completed initialization of buffer pool
  :: InnoDB: highest supported file format is Barracuda.
  ::  InnoDB: Waiting for the background threads to start
  :: InnoDB: 5.5. started; log sequence number
  :: [Note] Server hostname (bind-address): '0.0.0.0'; port:
  :: [Note]   - '0.0.0.0' resolves to '0.0.0.0';
  :: [Note] Server socket created on IP: '0.0.0.0'.
  :: [ERROR] Can't start server : Bind on unix socket: Permission denied
  :: [ERROR] Do you already have another mysqld server running on socket: /var/lib/mysql/mysql.sock ?
  :: [ERROR] Aborting

注意  Can't start server : Bind on unix socket: Permission denied

发现  /var/lib/mysql 目录下并没有生成mysql.sock  预计是权限问题

于是修改

[root@fjgh ~]# chmod  /var/lib/mysql
[root@fjgh ~]# service mysqld start
Starting MySQL.. SUCCESS! 

启动成功

突然又发现 mysql -v 执行出错

[root@fjgh bin]# mysql -v
-bash: msysql: command not found

查看环境变量配置

[root@fjgh bin]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/local/java/jdk1..0_212/bin:/root/bin:/usr/local/mysql-5.5./bin

发现配置的mysql的bin目录不对，应该是  /usr/local/mysql-5.5.62/bin

修改，刷新配置即可

[root@fjgh bin]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/local/java/jdk1..0_212/bin:/root/bin:/usr/local/mysql-5.5./bin
[root@fjgh bin]# source ~/.bash_profile
[root@fjgh bin]# echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/local/java/jdk1..0_212/bin:/root/bin:/usr/local/mysql-5.5./bin:/root/bin:/usr/local/mysql-5.5./bin