Redis是高效的对象缓存程序。如果您有基于Litespeed (OpenLitespeed)服务器Wordpress网站，且已经安装了LSCache, 那么配合对象缓存程序，能够让您的网站进一步提速。
不过，同为对象缓存程序，Redis和Memcached只能选择一项安装。对于Litespeed/Wordpress系统，这两者作为对象缓存程序在性能上没有太大差异。上一次我们介绍了编译安装Memcached的方法，今天我们将介绍如何安装Redis服务器。
本文作者为香菇肥牛，原文链接为https://qing.su/article/install-redis-for-litespeed.html, 转载需注明原文链接。谢谢！
1. 系统环境
本文的操作系统为Ubuntu 20.04 LTS 64 bit, 服务器操作环境为OpenLitespeed服务器与LSPHP 7.4.
其他版本的安装步骤类似。
2. 安装Redis服务器
我们直接从包管理器安装Redis服务器即可。执行下面的命令：
1 2 | apt-get update && apt-get upgrade -y apt-get install redis -y |
如果您使用的是CentOS系列，安装Redis服务器的命令如下：
1 2 3 | yum update -y yum install epel-release -y yum install redis -y |
3. 编译安装php-redis拓展
Redis的安装要比Memcached简单得多，主要原因是其PHP拓展安装比较方便。
首先，安装必要的编译环境。
1 | apt-get install build-essential zlib1g-dev libexpat1-dev openssl libssl-dev libsasl2-dev libpcre3-dev -y |
然后从pecl获取php-redis源码：
1 2 3 | wget https://pecl.php.net/get/redis -O redis.tgz tar xvf redis.tgz cd redis-* |
开始编译之前，首先需要用phpize将源码预处理。一般情况下，OpenLitespeed不会预装phpize，我们需要额外安装lsphp74-dev包。
1 2 | apt-get install lsphp74-dev -y /usr/local/lsws/lsphp74/bin/phpize7.4 |
现在可以开始编译了。
1 2 3 | ./configure --with-php-config=/usr/local/lsws/lsphp74/bin/php-config7.4 make make install |
make install的时候，系统会提示php-redis拓展的安装路径，如下图。
比如，我这里是/usr/local/lsws/lsphp74/lib/php/20190902/redis.so
因此，编辑php.ini文件，写入redis拓展位置：
1 | echo "extension=/usr/local/lsws/lsphp74/lib/php/20190902/redis.so" >> /usr/local/lsws/lsphp74/etc/php/7.4/litespeed/php.ini |
最后，重启OpenLitespeed:
1 | /usr/local/lsws/bin/lswsctrl restart |
4. 检验php-redis安装
安装好Redis服务器与php-redis拓展后，我们应该能在phpinfo()中看到对应的Redis块，如下图：
在SSH中，我们也可以检测Redis服务器是否正常运行。执行：
1 | redis-cli ping |
如果Redis正常运行，可以看到下面的回应：
1 | PONG |
5. 为WordPress开启Redis对象缓存
安装完毕后，我们只要在LSCache中开启redis功能，即可使用对象缓存了。
如上图。如果正确安装了Redis, 则Redis Extension与Connection Test的值应该均为绿色。
综上，我们在Ubuntu 20.04 LTS操作系统中安装了Redis服务器与lsphp-redis拓展，联用Redis对象缓存与LSCache为WordPress提速。如果您有任何疑问，欢迎在这留言，我将尽量解答。
本文作者为香菇肥牛，原文链接为https://qing.su/article/install-redis-for-litespeed.html, 转载需注明原文链接。谢谢！
测试过效果如何没？
就是正常Redis应该起到的效果，如果需要进一步提升就得自己优化了
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