WordPress uses Redis to speed up caching

1. Redis configuration, installation, etc.

1. Redis introduction and advantages

REmote DIctionary Server (Redis) is a key-value storage system written by Salvatore Sanfilippo. Redis provides a variety of data structures, including lists, sets, ordered sets, and hashes, as well as the same strings structure as Memcached. Redis also includes rich operations on these data structures.

Advantages of Redis

High performance – Redis can support over 100K+ read and write frequencies per second.
Rich data types – Redis supports Strings, Lists, Hashes, Sets and Ordered Sets data type operations in binary cases.
Atomic – All Redis operations are atomic, and Redis also supports atomic execution of several operations after merging.
Rich features – Redis also supports publish/subscribe, notification, key expiration and other features.

2. Installation on VPS

Installation under Debian:

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

Installation under Centros:

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. Copy files

Put several executable files in the src directory redis-benchmark, redis-check-aof, redis-check-
Copy dump, redis-cli, redis-sentinel, redis-server and redis.conf files to where you want them. For example, I copied them to /usr/local/redis/bin and /usr/local/redis/etc. The command is as follows:

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 '[email protected]*[email protected] /var/run/[email protected]' /usr/local/redis/etc/redis.conf
sed -i '[email protected]*[email protected] /usr/local/redis/var/[email protected]' /usr/local/redis/etc/redis.conf
sed -i '[email protected]^dir.*[email protected] /usr/local/redis/[email protected]' /usr/local/redis/etc/redis.conf
sed -i '[email protected] [email protected] [email protected]' /usr/local/redis/etc/redis.conf
echo 'vm.overcommit_memory = 1' >> /etc/sysctl.conf
sysctl -p

4. Configure the boot-up auto-start redis-server

Under Debian:
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:
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. Start redis
Under Debian:
sudo update-rc.d redis-server defaults
sudo /etc/init.d/redis-server start

Centros:
service redis-server start

6. Testing

/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. Close redis

service redis-server stop

2. Configure WordPress

1. Enable WordPress to support Redis

Recommend predis. Add to the root directory of WordPress and execute the following

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

2. Front-end cached PHP script

Add to the root directory of WordPress and execute the following

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

Modify index-with-redis.php according to your needs, as follows:

$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

Replace index.php

mv index.php index.php_bk #Replace with the original index.php, or change the nginx pseudo-static rules
mv index-with-redis.php index.php

References:
http://redis.io/
How to load WordPress in a few milliseconds using Redis
Redis Introduction and Installation
WordPress starts Redis cache acceleration
Ubuntu installs and starts redis