mysql与redis的区别
mysql将数据储存在磁盘中，而redis运行时数据存在内存中，redis也支持数据持久化。
1、下载安装包、解压、安装
$ wget http://download.redis.io/releases/redis-2.8.3.tar.gz
$ tar xzf redis-2.8.3.tar.gz
$ cd redis-2.8.3
$ make
2、异常问题解决
（1）cc未找到
/bin/sh: cc: command not found
make[1]: *** [adlist.o] Error 127
make[1]: Leaving directory `/root/linux/redis-2.8.3/src'
make: *** [all] Error 2
[root@VM_0_5_centos redis-2.8.3]# ls
00-RELEASENOTES BUGS CONTRIBUTING COPYING deps INSTALL Makefile MANIFESTO README redis.conf runtest sentinel.conf src tests utils
[root@VM_0_5_centos redis-2.8.3]# make install
cd src && make install
make[1]: Entering directory `/root/linux/redis-2.8.3/src'
CC adlist.o
/bin/sh: cc: command not found
make[1]: *** [adlist.o] Error 127
make[1]: Leaving directory `/root/linux/redis-2.8.3/src'
make: *** [install] Error 2
解决方法，安装gcc
yum install gcc
（2）adlist.o 错误
cd src && make all
make[1]: Entering directory `/root/linux/redis-3.0.1/src'
CC adlist.o
In file included from adlist.c:34:0:
zmalloc.h:50:31: fatal error: jemalloc/jemalloc.h: No such file or directory
#include <jemalloc/jemalloc.h>
^
compilation terminated.
make[1]: *** [adlist.o] Error 1
make[1]: Leaving directory `/root/linux/redis-3.0.1/src'
make: *** [all] Error 2
解决方法，修改配置
编辑src/.make-settings里的OPT,将OPT改为OPT=-O2 -march=x86-64
（3）编译 redis 报错 error: jemalloc/jemalloc.h: No such file or directory
zmalloc.h:50:31: error: jemalloc/jemalloc.h: No such file or directory
zmalloc.h:55:2: error: #error "Newer version of jemalloc required"
原因是jemalloc重载了Linux下的ANSI C的malloc和free函数。解决办法：make时添加参数。
make MALLOC=libc
(4) You need tcl 8.5 or newer in order to run the Redis test
yum install tcl
3、启动服务
./redis-server ../redis.conf &
检查端口是否在监听，在监听说明启动成功
netstat -lntp | grep 6379
4、设置密码
将redis.conf中的#requirepass foobared去掉注释，foobared改为自己的密码
5、客户端连接
如果设置了密码，直接连接会报无权限的错误，需要在连接时输入密码
$ ./redis-cli -h 127.0.0.1 -p 6379 -a foobared
6、出现权限拒绝时
验证密码即可 :输入命令auth "密码"
127.0.0.1:6379> auth "xiaoxigua"
OK