无法连接到Mysql服务器;无法创建/写pid文件

Question

你好，我似乎无法连接到我的MySQL服务器时，我得到以下错误

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

当我检查了日志，它向我展示了以下内容：

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 

Answer 1

我在Redhat下有同样的问题，this page有步骤来使它工作。

Answer 2

我有与MySQL的示例问题。我在根权限下运行，但不知道为什么会发生此错误。问题是mysql用户没有权限在/var/run/mysqld中创建pid文件。 完整的日志可能看起来像：

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，解决办法是mysql用户分配到该目录：

# chown mysql:mysql /var/run/mysqld 

，然后启动mysqld

# service mysqld start 

Answer 3

在某些情况下，这个错误因为我们在日志文件中有错误的权限/var/log/mysqld.log

chown mysql:mysql /var/run/mysqld 

Answer 4

2小时后失踪质量Netflix的节目我只是径自：

chmod -R 777 /usr/local/mysql 
chmod -R 777 /usr/local/mysql-5.6.19-osx10.7-x86_64 

...在OSX小牛。 PITA。