sudo groupadd mysql  
sudo useradd -r -g mysql mysql #-r：创建无登录权限的账户

tar –zxvf mysql-5.5.-linux2.-x86_64.tar.gz  
sudo mv mysql-5.5.-linux2.-x86_64 /usr/local/

cd /usr/local/
sudo ln -s  mysql-5.5.-linux2.-x86_64 mysql
sudo chown -R mysql .  
sudo chgrp -R mysql .
cd mysql/bin
sudo chown -h mysql:mysql libmysqlclient.so. libmysqlclient.so libmysqlclient_r.so. libmysqlclient_r.so

sudo scripts/mysql_install_db --user=mysql   

# 将文件的所有属性改为root用户。  
sudo chown -R root .  
# 将数据目录的所有属性改为mysql用户。  
sudo chown -R mysql data  
# 下面这条给所有人弄data的权限，仅为了方便调试,不需要  
sudo chmod a+rwx -R data  

# 下面的命令可选。copy配置文件到相关目录  
sudo cp support-files/my-medium.cnf /etc/my.cnf  
启动mysql  
sudo bin/mysqld_safe --user=mysql &  
# 下面的命令可选。开机自启动mysql.server服务.  
# To start mysqld at boot time you have to copy  
# support-files/mysql.server to the right place for your system  
sudo cp support-files/mysql.server /etc/init.d/mysql.server  
service mysql.server start  
# 查看启动是否正常  
./bin/mysqladmin version

./bin/mysqladmin -u root -p password ='root'