How to setup Redis with LiteSpeed Web Server

This guide is valid for both no Control Panel and with control panels.

1. Add the EPEL repository:
   

   yum install epel-release 

2. Install Redis:
   

   yum install redis

3. Start Redis:
   

   systemctl start redis

The phpredis extension provides an API for communicating with the Redis key-value store.

1. Add the litespeed repository:
   

   rpm -ivh http://rpms.litespeedtech.com/centos/litespeed-repo-1.1-1.el7.noarch.rpm

2. List the litespeed Redis PHP extension
   

   yum list | awk '/lsphp/&&/redis/'

3. Install PHP version depends on which version you are using:
   

   yum -y install lsphp71-pecl-redis

1. Installing the Redis PHP extension for all available versions of PHP:
   

   for phpver in $(ls -1 /opt/cpanel/ |grep ea-php | sed 's/ea-php//g') ; do
   cd ~
   wget -O redis.tgz https://pecl.php.net/get/redis
   tar -xvf redis.tgz
   cd ~/redis* || exit
   /opt/cpanel/ea-php"$phpver"/root/usr/bin/phpize
   ./configure --with-php-config=/opt/cpanel/ea-php"$phpver"/root/usr/bin/php-config
   make && make install
   echo 'extension=redis.so' > /opt/cpanel/ea-php"$phpver"/root/etc/php.d/redis.ini
   rm -rf ~/redis*
   done
   
   /scripts/restartsrv_httpd
   /scripts/restartsrv_apache_php_fpm

2. Check Redis:
   

   for phpver in $(ls -1 /opt/cpanel/ |grep php | sed 's/ea-php//g') ; do
   echo "PHP $phpver" ; /opt/cpanel/ea-php$phpver/root/usr/bin/php -i |grep "Redis Support"
   done

   Output should be:

   PHP 55
   Redis Support => enabled
   PHP 56
   Redis Support => enabled
   PHP 70
   Redis Support => enabled 

• Note:
  • Checking newest PHP redis version here
  • For More description please follow Git

1. Verify that Redis is running with redis-cli:
   

   redis-cli ping

   
   If Redis is running, it will return:

   PONG

2. Verify by using LiteSpeed default PHP info page http://Server_IP:8088/phpinfo.php:
   

1. A typical example would be:
   

    redis-benchmark -q -n 100000 

   Output:

   PING_INLINE: 31826.86 requests per second
   PING_BULK: 31595.58 requests per second
   SET: 33568.31 requests per second
   GET: 31908.10 requests per second
   INCR: 32647.73 requests per second
   LPUSH: 31220.73 requests per second
   RPUSH: 31565.66 requests per second
   LPOP: 31555.70 requests per second
   

2. If you want to run one million SET operations, using a random key for every operation out of 100k possible keys, you can use the following command line:
   

   redis-cli flushall 
   redis-benchmark -t set -r 100000 -n 1000000

   Output:

   ====== SET ======
     1000000 requests completed in 32.43 seconds
     50 parallel clients
     3 bytes payload
     keep alive: 1
   99.98% <= 10 milliseconds
   99.99% <= 11 milliseconds
   99.99% <= 12 milliseconds
   100.00% <= 17 milliseconds
   30833.75 requests per second

• Note:
  • For more information, please refer here

1. WordPress install Redis Object Cache Plugin
   
2. Activate and click Enable Object Cache button
   
3. Confirm Status is Connected
   
4. Confirm Diagnostics shows Redis with version
   
5. Edit wp-config.php and at the end of the Authentication Unique Keys and Salts section, add the following lines:
   1. define('WP_CACHE_KEY_SALT', 'string');
   2. define('WP_CACHE', true);
6. Restart LSWS
   

   service lsws restart

7. Test WordPress is communicating with Redis by monitor command:
   

    redis-cli monitor 

   

• If you want to setup Master-Slave Replication, you may need to enable firewall for port 6379

  firewall-cmd --permanent --zone=public --add-port=6379/tcp
  firewall-cmd --reload 

• To automatically start Redis on boot:
  

  systemctl enable redis

• For disk persistence, you can set /etc/redis.conf:
  • appendonly yes
  • appendfsync everysec
• More Redis Security information please follow here