Cant connect to Mysql server ; Can't create/write the pid file

问题:

Hello I cant seem to connect to my mysql server, i get the following error

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

when i checked the logs , it showed me the following :

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 

回答1:

I had sample problem with mysql. I run under root permission but don't known why this error happen. The problem is mysql user don't have permission to create pid file in /var/run/mysqld. Full log could look like:

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 

So the solution is assign mysql user to this directory:

# chown mysql:mysql /var/run/mysqld 

and then start mysqld

# service mysqld start 

回答2:

I had the same problem under Redhat and this page had the steps to get it to work.

回答3:

In some cases, this error is because we have wrong permissions in log file /var/log/mysqld.log

chown mysql:mysql /var/run/mysqld 

回答4:

After 2 hours of missing quality Netflix programming I just went ahead and:

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

... on OSX Mavericks. PITA.

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