Mysql installation and environment variable settings and password cracking

1、mysql安装

#usedel mysql

#groupdel mysql

#groupadd mysql

#useradd -g mysql mysql

#tar -zxvf mysql-5.1.55.tar.gz

#cd mysql-5.1.55

#./configure

#>—prefix=/program/mysql                 //安装路径

#>—localstatedir=/var/lib/mysql         //数据库文件存放路径

#>—with-comment=Source

#>—with-server-suffix=-Community

#>—with-mysqld-user=mysql

#>—without-debug

#>—with-big-tables

#>—with-charset=utf8

#>—with-collation=utf8_unicode_ci

#>—with-extra-charsets=all

#>—with-pthread

#>—enable-static

#>—enable-thread-safe-client

#>—with-client-ldflags=-all-static

#>—with-mysqld-ldflags=-all-static

#>—enable-assembler

#>—without-innodb

 

#>—with-innodb

 

#>—without-isam

 

#>—without-ndb-debug

 

#>—with-unix-socket-path=/var/lib/mysql/mysql.sock

 

#make && make install

 

#cp ./support-files/my-medium.cnf /etc/my.cnf

 

#/usr/local/mysql/bin/mysql_install_db —user=mysql

 

#chown mysql:mysql -R /usr/local/mysql

 

#chgrp -R mysql /usr/local/mysql

 

#/usr/local/mysql/bin/mysqld_safe —user=mysql &

 

#chmod +x ./support-files/mysql.server

 

#cp ./support-files/mysql.server /etc/init.d/mysqld

 

#chkconfig –add mysqld

 

#chkconfig –level 2345 mysqld on

 

#service mysqld restart

 

#/usr/local/mysql/bin/mysqladmin -uroot password “new_pass”  //修改root用户密码

 

#netstat -nplt |grep mysql            //查看mysql监听端口的信息

 

#ps -aux |grep mysql                //查看mysql运行的进程信息

 

 

2、mysql密码恢复

 

#service mysqld stop

 

#killall -TERM mysqld

 

#/usr/local/mysql/bin/safe_mysqld —skip-grant-tables &

 

#/usr/local/mysql/bin/mysq/mysql

 

>use msyqlmysql

 

>upadate user set password=password(“new_pass”) where user=”root”;

 

>flush privileges;

 

>exit

 

#service mysqld start#mysql -uroot -p        //如果提示输入密码表明破解密码成功完成；

 

 

3、mysql环境变量的设置：

 

第一种：

 

#export PATH=$PATH:/usr/local/mysql/bin/

 

#export   //查看环境变量

 

第二种：

 

#vi /etc/profileexport PATH=”$PATH:文件路径”        //通过配置文件修改环境变量（需要注销系统才能生效）

 

#env       //查看环境变量

 

第三种：

 

#vi /root/.bashrcexport PATH=”$PATH:文件路径”        //修改root用户的环境变量（需要注销系统才能生效）

 

#echo $PATH  //查看环境变量