How to configure memcached on Vesta + Bitrix?

Question

1C-Bitrix

Good afternoon!

Tell me, I can’t set up memcached on 1C-Bitrix (centos7). There is a Vesta panel.
When configuring, it issues Cache storage: cacheenginenone
And the scaling control module (scale) is not displayed

Specified in /bitrix/.settings.php (prescribed in .settings_extra.php as well)

'cache' => array(
    'value' => array (
        'type' => 'memcache',
        'memcache' => array(
            'host' => '127.0.0.1',
            'port' => '11211',
            'sid' => $_SERVER["DOCUMENT_ROOT"]."#site01",
        ),
    ),
    'readonly' => false,
),

Specified in etc/sysconfig/memcached

PORT="11211"
USER="bitrix"
MAXCONN="10240"
CACHESIZE="2048"
OPTIONS="-t 8 -s /tmp/memcached.sock"

Tried other options OPTIONS="-t 8"

Answer 1

it doesn't make sense if you don't have a cluster and don't need to balance sessions.
memcached will not give you an increase in relation to the file cache + opcache
it connects via TCP \ IP and even through a socket it will not actually give any increase.
But problems with caching can arise, especially in deferred functions and complex components.
not worth the hassle.
nvme drives handle IO just fine, while others don't take sms at the moment.
the fastest way Bitrix works is nginx + FPM
Also, upgrading the PHP version gives a good increase sometimes up to 30% (nevertheless, it works faster and faster every day.
Well, the main emphasis is on the quality cache of components

Answer 2

OPTIONS="-t 8 -s /tmp/memcached.sock" - this tells memcached to work over a socket. In this case, the ability to work via TCP / UDP is disabled
Link to the memcached documentation where it says this
Your configuration should look like this

'memcache' => array(
            'host' => 'unix:///tmp/memcached.sock',
            'port' => '0',
            'sid' => $_SERVER["DOCUMENT_ROOT"]."#site01",
        ),

Manual configuration of memcached - see section Working with memcached via socket