debian方式：
apt-get install mysql-server-5.5
mysql -u root -p
redhat安装方式
一、下载并解压
$ wget http://cdn.mysql.com/Downloads/MySQL-5.5/MySQL-5.5.42-1.el6.x86_64.rpm-bundle.tar
解压后得到以下几个文件：
$ tar -xvf MySQL-5.5.42-1.el6.x86_64.rpm-bundle.tar
MySQL-shared-5.5.42-1.el6.x86_64.rpm
MySQL-shared-compat-5.5.42-1.el6.x86_64.rpm
MySQL-server-5.5.42-1.el6.x86_64.rpm
MySQL-devel-5.5.42-1.el6.x86_64.rpm
MySQL-test-5.5.42-1.el6.x86_64.rpm
MySQL-client-5.5.42-1.el6.x86_64.rpm
MySQL-embedded-5.5.42-1.el6.x86_64.rpm
二、安装
1、安装server
（1）# rpm -ivh MySQL-server-5.5.42-1.el6.x86_64.rpm
（2）若出现冲突错误，则是由于linux可能自带了mysql的库，需要先将之删除
# rpm -e mysql-libs.x86_64 --nodeps
2、安装client
# rpm -ivh MySQL-client-5.5.42-1.el6.x86_64.rpm
三、关于配置文件
# ls *.cnf
my-huge.cnf my-innodb-heavy-4G.cnf my-large.cnf my-medium.cnf my-small.cnf
# pwd
/usr/share/mysql
使用rpm方法进行安装时，配置文件放在/usr/share/mysql中，可根据需要放到其它地方。
四、启动及关闭
1、方式一：命令行方式
# mysqld_safe &
# mysqladmin -uroot shutdown
2、方式二：服务方式
# service mysql start
# service mysql stop
# service mysql restart
3、连接数据库开始使用
# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.42 MySQL Community Server (GPL)
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
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