Centos版本为6.9，Redis版本为4.0.4
首先下载Redis，官网为 https://redis.io/download
$ wget http://download.redis.io/releases/redis-4.0.4.tar.gz
$ tar xzf redis-4.0.4.tar.gz
$ cd redis-4.0.4
$ make
$ make test
$ make install
这里在执行 make test 的时候如果出现问题,需要Tcl8.5的库
错误1：
You need tcl 8.5 or newer in order to run the Redis test
解决：
# yum install tcl
错误2：
[exception]: Executing test client: NOREPLICAS Not enough good slaves to write..
NOREPLICAS Not enough good slaves to write.
......
Killing still running Redis server 63439
Killing still running Redis server 63486
Killing still running Redis server 63519
Killing still running Redis server 63546
Killing still running Redis server 63574
Killing still running Redis server 63591
I/O error reading reply
......
解决：
vim tests/integration/replication-2.tcl
- after 1000
+ after 10000
错误3：
[err]: Slave should be able to synchronize with the master
in tests/integration/replication-psync.tcl
Replication not started.
解决：
遇见过一次，重试make test就ok了。
错误4：
[err]: Test replication partial resync: ok psync (diskless: yes, reconnect: 1) in tests/integration/replication-psync.tcl
解决：
vimtests/integration/replication-psync.tcl
- after 100
+ after 1000
接下来 make PREFIX=/usr/local/redis install
会在/usr/local/redis下生产bin文件夹 bin下面有
redis-benchmark redis性能检测工具
redis-check-rdb 检查rbd日志的工具
redis-sentinelRedis集群的管理工具监控多个master-slave集群，发现master宕机后能进行自动切换
redis-check-aof 检查aof日志的 工具
redis-cli redis-server 等文件
我们来到bin的目录下，执行 ./redis-server& ,如果看到下图就说明redis服务已经启动成功。
稍后再写如何开启自动开启redis服务
接下来开始安装PHP的Redis扩展
yum install php-devel
wget https://github.com/nicolasff/phpredis/archive/master.zip
如果没装unzip，需要先安装unzip
yum install unzip
unzip master.zip
解压目录为phpredis-master，进入该文件夹，开始编译php扩展
phpize
配置环境
./configure
编译
make && make install
进入/usr/lib64/php/modules/文件夹，发现redis.so的扩展
修改/etc/php.ini,添加下面的扩展
重启服务器
service httpd restart
重启服务器后查看phpinfo，如下图所示
