启动mysql时报错：

Starting mysqld daemon with databases from /var/lib/mysql

STOPPING server from pid file /var/run/mysqld/mysqld.pid

071112 00:22:06 mysqld ended

查看日志：

＃less /var/log/mysqld.log

其中有一段如下：

071112 0:22:06 [ERROR] /usr/local/mysql/bin/mysqld: Can't

create/write to file '/var/run/mysqld/mysqld.pid' (Errcode:

2)

071112 0:22:06 [ERROR] Can't start server: can't create PID file:

No such file or directory

071112 00:22:06 mysqld ended

#cd /var/run/

#ls

mysqld目录不存在，创建它：

#mkdir /var/run/mysqld

#cd /var/run/mysqld

创建文件mysqld.pid：

#touch mysqld.pid

#cd..

#chown -R mysql mysqld .

#cd /usr/local/mysql/

#bin/mysqld_safe --user=mysql &

nohup: ignoring input and redirecting stderr to stdout

Starting mysqld daemon with databases from /var/lib/mysql

能正常启动

#bin/mysqladmin -u root password root

又出错

[root@localhost mysql]# bin/mysqladmin -u root password

root

bin/mysqladmin: connect to server at 'localhost' failed

error: 'Can't connect to local MySQL server through socket

'/tmp/mysql.sock' (2)'

Check that mysqld is running and that the socket: '/tmp/mysql.sock'

exists!

[root@localhost mysql]# bin/mysql -u root -p

Enter password:

ERROR 2002 (HY000): Can't connect to local MySQL server through

socket '/tmp/mysql.sock' (2)

分析：是/tmp/mysql.sock 不存在

# cd /var/lib/mysql/

由于mysql 默认的mysql.sock 是在/var/lib/mysql/mysql.sock，创建符号连接：

# ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock

# bin/mysql -u root

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 1

Server version: 5.0.45 MySQL Community Server (GPL)

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

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