Mysql問題：沒有mysql.sock

Question

昨天我正在使用我的電腦上安裝的MySQL。
我下載的XAMPP，所以我有我改變了對my.cnf文件的路徑套接字：

/opt/lampp/var/mysql/mysql.sock 

這個文件只是在那裏。今天，我想繼續做這個工作，我發現文件不存在了，所以我得到了下面的錯誤，而我啓動MySQL服務器：

ERROR 2002 (HY000): 
Can't connect to local MySQL server through socket 
'/opt/lampp/var/mysql/mysql.sock' (2) 

這裏有一些測試中，我提出：

mujeresponja@ubuntu:~$ ps -fea | grep mysqld 
1000  15707 15615 0 16:28 pts/1 00:00:00 grep --color=auto mysqld 
mujeresponja@ubuntu:~$ ps -fea | grep mysql 
1000  15709 15615 0 16:29 pts/1 00:00:00 grep --color=auto mysql 

作爲一種可能的解決方案，我卸載了xampp並重新安裝了它，並且還安裝了一個新的MySQL服務器，以防萬一。無論如何，該文件已不存在了。

編輯 凡的mysql.sock是應該的，而不是有兩個文件mysql_upgrade_info（其中只包含5.5.8），另一個二進制文件名爲ubuntu.err：

mujeresponja@ubuntu:/opt/lampp/var/mysql$ sudo cat ubuntu.err 
110403 17:28:52 mysqld_safe Starting mysqld daemon with databases from /opt/lampp/var/mysql 
110403 17:28:52 [Note] Plugin 'FEDERATED' is disabled. 
/opt/lampp/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13) 
110403 17:28:52 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 
InnoDB: The InnoDB memory heap is disabled 
InnoDB: Mutexes and rw_locks use InnoDB's own implementation 
InnoDB: Compressed tables use zlib 1.2.3 
110403 17:28:52 InnoDB: Initializing buffer pool, size = 16.0M 
110403 17:28:52 InnoDB: Completed initialization of buffer pool 
110403 17:28:52 InnoDB: Operating system error number 13 in a file operation. 
InnoDB: The error means mysqld does not have the access rights to 
InnoDB: the directory. 
InnoDB: File name /opt/lampp/var/mysql/ibdata1 
InnoDB: File operation call: 'create'. 
InnoDB: Cannot continue operation. 
110403 17:28:52 mysqld_safe mysqld from pid file /opt/lampp/var/mysql/ubuntu.pid ended 
110403 17:29:22 mysqld_safe Starting mysqld daemon with databases from /opt/lampp/var/mysql 
110403 17:29:22 [Note] Plugin 'FEDERATED' is disabled. 
/opt/lampp/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13) 
110403 17:29:22 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 
InnoDB: The InnoDB memory heap is disabled 
InnoDB: Mutexes and rw_locks use InnoDB's own implementation 
InnoDB: Compressed tables use zlib 1.2.3 
110403 17:29:22 InnoDB: Initializing buffer pool, size = 16.0M 
110403 17:29:22 InnoDB: Completed initialization of buffer pool 
110403 17:29:22 InnoDB: Operating system error number 13 in a file operation. 
InnoDB: The error means mysqld does not have the access rights to 
InnoDB: the directory. 
InnoDB: File name /opt/lampp/var/mysql/ibdata1 
InnoDB: File operation call: 'create'. 
InnoDB: Cannot continue operation. 
110403 17:29:22 mysqld_safe mysqld from pid file /opt/lampp/var/mysql/ubuntu.pid ended 

（對不起，我不知道如何以適當的方式顯示終端消息） 任何人都可以幫助我嗎？提前致謝！

Answer 1

你可以找到實際的套接字文件，並創建一個符號鏈接導致它如下：

# check path to socket from mysql settings 
mysqladmin | grep d.sock 

# create a symbolic link 
ln -s path_to_mysql_socket /opt/lampp/var/mysql/mysql.sock 

Answer 2

雖然你做的測試有點亂碼，我會假設測試只是證明mysql沒有運行。

根據MySQL的配置方式本身應該有一個啓動文件的地方，通常是周圍的/etc/rc.*目錄，你需要運行rc.mysql開始（也可能是在一個S<nn>MySQL rc3.d中的目錄，例如

Answer 3

我沒有找到某種原因，我的問題 我只是unisntalled並重新安裝，然後一切正常。
這不是一個真正的解決方案，但它工作。祝你好運

Answer 4

當我向*。*授予其他用戶時，我遇到了同樣的情況。 Mysql試圖爲mysql數據庫提供權限，並引發了這場災難：即刻，mysql.sock文件消失了。

發生這種情況與5.6版

Answer 5

我與你有同樣的問題，我發現一些有用的信息：

2015-08-14 10:51:17 30934 [ERROR] InnoDB: Unable to lock /opt/lampp/var/mysql/ibdata1, error: 11 
2015-08-14 10:51:17 30934 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files. 

所以，我重新啓動電腦並重新啓動XAMPP，問題是解決。