WordPress使用Redis加速缓存

一、Redis配置、安装等

1、Redis介绍及优点

REmote DIctionary Server(Redis) 是一个由Salvatore Sanfilippo写的key-value存储系统。Redis提供了一些丰富的数据结构，包括lists, sets, ordered sets以及 hashes ，当然还有和Memcached一样的 strings结构.Redis当然还包括了对这些数据结构的丰富操作。

Redis的优点

性能极高 – Redis能支持超过 100K+ 每秒的读写频率。
丰富的数据类型 – Redis支持二进制案例的 Strings, Lists, Hashes, Sets 及 Ordered Sets 数据类型操作。
原子 – Redis的所有操作都是原子性的，同时Redis还支持对几个操作全并后的原子性执行。
丰富的特性 – Redis还支持 publish/subscribe, 通知, key 过期等等特性。

2、VPS下的安装

Debian下的安装：

wget http://download.redis.io/releases/redis-2.8.9.tar.gz
tar xvfz redis-2.8.9.tar.gz
cd redis-2.8.9
sudo make
sudo make install

Centros下的安装：

wget http://download.redis.io/releases/redis-2.8.19.tar.gz
tar xzf redis-2.8.19.tar.gz
cd redis-2.8.19
make

3、复制文件

把src目录下的几个可执行文件redis-benchmark,redis-check-aof,redis-check-
dump,redis-cli,redis-sentinel,redis-server和redis.conf文件复制到你所希望的地方，比如我是复制到/usr/local/redis/bin 和/usr/local/redis/etc 下面的，命令如下：

mkdir -p /usr/local/redis/{bin,etc,var}
/bin/cp src/{redis-benchmark,redis-check-aof,redis-check-dump,redis-cli,redis-sentinel,redis-server} /usr/local/redis/bin/
/bin/cp redis.conf /usr/local/redis/etc/
ln -s /usr/local/redis/bin/* /usr/local/bin/
sed -i ‘s@pidfile.*$@pidfile /var/run/redis.pid@’ /usr/local/redis/etc/redis.conf
sed -i ‘s@logfile.*$@logfile /usr/local/redis/var/redis.log@’ /usr/local/redis/etc/redis.conf
sed -i ‘s@^dir.*$@dir /usr/local/redis/var@’ /usr/local/redis/etc/redis.conf
sed -i ‘s@daemonize no@daemonize yes@’ /usr/local/redis/etc/redis.conf
echo ‘vm.overcommit_memory = 1’ >> /etc/sysctl.conf
sysctl -p

4、配置开机自启动redis-server

Debian下：
wget https://github.com/ijonas/dotfiles/raw/master/etc/init.d/redis-server
wget https://github.com/ijonas/dotfiles/raw/master/etc/redis.conf
sudo mv redis-server /etc/init.d/redis-server
sudo chmod +x /etc/init.d/redis-server
sudo mv redis.conf /etc/redis.conf

sudo useradd redis
sudo mkdir -p /var/lib/redis
sudo mkdir -p /var/log/redis
sudo chown redis.redis /var/lib/redis
sudo chown redis.redis /var/log/redis

Centros下：
wget https://raw.githubusercontent.com/lj2007331/lnmp/master/init/Redis-server-init-CentOS
mv Redis-server-init-CentOS /etc/init.d/redis-server
chmod +x /etc/init.d/redis-server
chkconfig –add redis-server
chkconfig redis-server

5、启动redis
Debian下：
sudo update-rc.d redis-server defaults
sudo /etc/init.d/redis-server start

Centros下：
service redis-server start

6、测试

/usr/local/redis/bin/redis-cli
redis 127.0.0.1:6379> set name wiki8
OK
redis 127.0.0.1:6379> get name
“wiki8”

7、关闭redis

service redis-server stop

二、配置WordPress

1、使wordpress支持Redis

推荐predis. 加入WordPress的根目录，执行下面

wget http://uploads.staticjw.com/ji/jim/predis.php
chown www.www ./predis.php

2、前端缓存的PHP脚本

加入WordPress的根目录，执行下面

wget https://gist.githubusercontent.com/JimWestergren/3053250/raw/d9e279e31cbee4a1520f59108a4418ae396b2dde/index-with-redis.php
chown www.www ./index-with-redis.php

根据自己需求修改index-with-redis.php，修改如下：

$cf = 0; // set to 1 if you are using cloudflare
$debug = 1; // set to 1 if you wish to see execution time and cache actions
$display_powered_by_redis = 0; // set to 1 if you want to display a powered by redis message with execution time, see below

替换index.php

mv index.php index.php_bk #替换到原来的index.php，也可以改nginx伪静态规则
mv index-with-redis.php index.php

参考资料：
http://redis.io/
How to load WordPress in a few milliseconds using Redis
Redis简介和安装
wordpress启动Redis缓存加速
ubuntu安装启动redis

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