centos下面用yum命令直接安装不了redis，因为官方源里面没有自带这个
1：去下面的网站下载EPEL对应的版本：（epel是fedora维护的yum源，里面软件众多）
http://fedoraproject.org/wiki/EPEL
2：我下载的是这个：
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
3：安装epel：
rpm -ivh epel-release-6-8.noarch.rpm
warning: epel-release-6-8.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Preparing... ########################################### [100%]
1:epel-release ########################################### [100%]
4：安装redis：
[root@CentOS6 ~]# yum install redis
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/metalink | 4.1 kB 00:00
* base: mirrors.btte.net
* epel: mirrors.sohu.com
* extras: mirrors.btte.net
* updates: mirrors.btte.net
epel | 4.3 kB 00:00
epel/primary_db | 5.0 MB 00:43
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package redis.x86_64 0:2.4.10-1.el6 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
redis x86_64 2.4.10-1.el6 epel 213 k
Transaction Summary
================================================================================
Install 1 Package(s)
Total download size: 213 k
Installed size: 668 k
Is this ok [y/N]:y
安装完成，启动
service redis start
用win机器下一个redis客户端，直接链接，默认的情况下，是拒绝链接的，这个时候，改下配置
在/etc/redis.conf里面，将bind localhost注释掉即可