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Install Redis Cache using the below command

sudo apt install redis

If you want to install from source code, use below step

wget http://download.redis.io/redis-stable.tar.gz

tar xvzf redis-stable.tar.gz

cd redis-stable

make

Configure Redis Cache using the below command

sudo nano /etc/redis/redis.conf

Replace the #maxmemory to the below line

maxmemory 128mb
maxmemory-policy allkeys-lfu

Save the file by pressing Ctrl + o then press Enter key then press Ctrl + x

Restart Redis Cache server and test using the below command

sudo service redis-server restart

redis-cli ping

Add PhpRedis using the below command

# check stable version of release we use development version

https://github.com/phpredis/phpredis/archive/refs/heads/develop.zip

unzip develop.zip

cd phpredis-develop

phpize

./configure

make

sudo make install

For Apache, follow the below steps, Note: change 7.x with your PHP version

sudo echo "extension=redis.so" > /etc/php/7.x/apache2/conf.d/redis.ini

apache2ctl restart

For Nginx, follow the below steps, Note: change 7.x with your PHP version

echo "extension=redis.so" > /etc/php/7.x/mods-available/redis.ini

ln -sf /etc/php/7.x/mods-available/redis.ini /etc/php/7.x/fpm/conf.d/20-redis.ini

ln -sf /etc/php/7.x/mods-available/redis.ini /etc/php/7.x/cli/conf.d/20-redis.ini

service php7.x-fpm restart

service nginx restart