Xenforo Optimising an caching XF

Yup if you're playing with Xenforo 2.0 Dev Preview releases, you'd want to read https://community.centminmod.com/posts/45274/ which will be updated as Xenforo 2.0 development goes on

For Xenforo 1.5.x caching, PHP 5.6+ has Zend Opcache for opcode caching which is automatic so nothing to configure. For backend caching for Centmin Mod you have choices of:

1. Memcached server is already installed by Centmin Mod
2. Redis server caching and instructions on how to install Redis server (1st post).

Xenforo Libmemcached/Memcached server backend cache

For Centmin Mod LEMP web stack powered Xenforo forum which has Libememcach/Memcached PHP extension and Memcached server installed out of the box.

As per official Xenforo manual, within your Xenforo library/config.php add or alter settings to the following, caching the cache_id_prefix value from xfxx_ to a unique one to each Xenforo installed instance on your server. So your library/config.php would have something like

PHP:

$config['cache']['enabled'] = true;
$config['cache']['cacheSessions'] = true;
$config['cache']['frontend'] = 'Core';
$config['cache']['frontendOptions'] = array(
'caching' => true,
'cache_id_prefix' => 'xfxx_',
'automatic_serialization' => false,
'lifetime' => 0
);

$config['cache']['backend'] = 'Libmemcached';

$config['cache']['backendOptions'] = array(
'servers' => array(
array(
'host' => '127.0.0.1',
'port' => 11211,
'weight' => 1
)
)
);

Xenforo Redis Cache Server backend cache via Zend Redis Cache Xenforo Addon

For Centmin Mod LEMP web stack powered Xenforo forum which has Redis server support via REMI Yum repository installation and out of box Redis PHP extension support as outlined above. Be sure to install the Zend Redis Cache Xenforo Addon by Xon for this to work.

You'll need to setup Redis server /etc/redis.conf as a LRU cache as outline at Using Redis as an LRU cache – Redis and in above 1st post. Basically. in /etc/redis.conf set a memory limit, eviction policy and LRU algorithm sample size.

Example with 100MB max memory limit for Redis used as a LRU cache

Code (Text):

maxmemory 100mb
maxmemory-policy allkeys-lru
maxmemory-samples 10

restart Redis server after making changes to /etc/redis.conf config file

Code (Text):

service redis restart

As per FAQ Zend Redis Cache - FAQ | XenForo Community

Within your Xenforo library/config.php add or alter settings to the following, caching the cache_id_prefix value from xfxx_ to a unique one to each Xenforo installed instance on your server

PHP:

$config['cache']['enabled'] = true;
$config['cache']['frontend'] = 'Core';
$config['cache']['frontendOptions']['cache_id_prefix'] = 'xfxx_';
$config['cache']['backend'] = 'Redis';
$config['cache']['backendOptions'] = array(
       'server' => '127.0.0.1',
       'port' => 6379,
       'database' => 1,
       'connect_retries' => 2,
       'use_lua' => true,
       'compress_data' => 2,
       'read_timeout' => 1,
       'timeout' => 1,
   );
require(XenForo_Application::getInstance()->getConfigDir().'/SV/RedisCache/Installer.php');


Ensure to flush Redis server cache after change

To flush all redis databases

Code (Text):

redis-cli FLUSHALL

To flush just database 8 if you set it differently from default database 0

Code (Text):

redis-cli -n 8 flushdb

You may need to re-login to your Xenforo forum. Browse your forums to populate the Redis cache and then check via PHP Redis Admin for database 0 or database 1 cache entries.