无法连接到Mysql服务器;无法创建/写入pid文件

您好我似乎无法连接到我的mysql服务器,我收到以下错误

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111)

当我检查日志时,它向我显示以下内容：

130314 12:36:16 [Note] Plugin 'FEDERATED' is disabled.
/usr/sbin/mysqld: Table 'plugin' is read only
130314 12:36:16 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
130314 12:36:16  InnoDB: Initializing buffer pool,size = 8.0M
130314 12:36:16  InnoDB: Completed initialization of buffer pool
130314 12:36:16  InnoDB: Started; log sequence number 13 1336891001
130314 12:36:16 [ERROR] /usr/sbin/mysqld: Can't create/write to file '/var/lib/mysql/live.pid' (Errcode: 13)
130314 12:36:16 [ERROR] Can't start server: can't create PID file: Permission denied

140812 09:35:53 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
140812  9:35:53  InnoDB: Initializing buffer pool,size = 8.0M
140812  9:35:53  InnoDB: Completed initialization of buffer pool
140812  9:35:53  InnoDB: Started; log sequence number 0 197396648
140812  9:35:53 [ERROR] /usr/libexec/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 13)
140812  9:35:53 [ERROR] Can't start server: can't create PID file: Permission denied
140812 09:35:53 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

因此解决方案是将mysql用户分配给此目录：

# chown mysql:mysql /var/run/mysqld

然后启动mysqld

# service mysqld start

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