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安装过程：

su 到root 权限。

#tar -zvxf mysql-5.0.45-linux-i686.tar.gz

#mv mysql-5.0.45/ /usr/local/mysql

#cd /usr/local/mysql

#groupadd mysql

#useradd -g mysql mysql

#chown -R mysql .

#chgrp -R mysql .

#scripts/mysql_install_db --user=mysql

#chown -R root .

#chown -R mysql data

#bin/mysqld_safe --user=mysql &

按照官方文档说这就应该能启动了，可是报错如下：

nohup: ignoring input and redirecting stderr to stdout

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

#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/

ibdata1 ib_logfile0 ib_logfile1 mysql/ mysql.sock test/

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.

mysql>

修改root 密码

#cd /usr/local/mysql/

#bin/mysqladmin -u root -p password yourpassword

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