解决Linux MySQL报错ERROR 2002 (HY000)

---------------------------------1---------------------------------

在Linux安装MySQL有时候会出现[mysql]ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) 这样的错误，具体解决办法如下：

[root@www ~]# rm -rf /var/lib/mysql/*
[root@www ~]# rm /var/lock/subsys/mysqld
rm: remove regular empty file `/var/lock/subsys/mysqld'? y
[root@www ~]# killall mysqld
[root@www ~]# service mysqld start
[root@www ~]# /etc/rc.d/init.d/mysqld status
mysqld (pid 5457) is running...

---------------------------------2---------------------------------

[root@r710-1 /]# mysql -u root
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
[root@r710-1 /]# vi /etc/my.cnf
##########添加如下内容：
[client]
socket=/var/lib/mysql/mysql.sock

##########保存退出后，
##########重启mysql
[root@r710-1 /]# service mysqld restart
Shutting down MySQL. [ OK ]
Starting MySQL. [ OK ]

[root@r710-1 /]# mysql -u root -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
[root@r710-1 /]# mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.45 MySQL Community Server (GPL)

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'rootpassword' WITH GRANT OPTION;

Query OK, 0 rows affected (0.00 sec)

mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'rootpassword' WITH GRANT OPTION;

exit
Bye
[root@r710-1 /]# mysql -u root -p

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当用户在执行mysql时报错
"ERROR 2002 (HY000): Cant connect to local MySQL server through socket /tmp/mysql.sock (2)"

原因是由于mysql 的mysql.sock 默认是在/var/lib/mysql/mysql.sock下，但linux系统总是去/tmp/mysql.sock查找，如果mysql.sock不存在，系统就会报错。

解决办法：
1.直接指定mysql通道
[root@localhost ~]# find / -name mysql.sock
/var/lib/mysql/mysql.sock
[root@localhost ~]# mysql --socket=/var/lib/mysql/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2 to server version: 5.0.22

Type help; or \h for help. Type \c to clear the buffer.

mysql>

2. 为mysql.sock创建软连接(类似快捷方式)
[root@localhost ~]# ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock

[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3 to server version: 5.0.22

Type help; or \h for help. Type \c to clear the buffer.

mysql>

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