Instalasi memcache untuk support php fpm

1. Instal memcache

apt-get -y update
apt install memcached libmemcached-tools

2. Check memcached service

Karena memcached jalan otomatis maka tinggal di double check saja

sudo systemctl status memcached

3. Edit konfigurasi memcached jika diperlukan 

sudo vi /etc/memcached.conf

Locate the -m parameter. Change its value to at least 1GB
Locate the -l parameter. Change its value to 127.0.0.1 or localhost

4. Install memcached untuk PHP

sudo apt install php-memcached

5. Install memcached python

pip install pymemcache
pip install python-memcached

6. Buka firewall untuk port memcached misal 11211

7. Check listening port 

sudo netstat -plunt

8. Check proses memcached

memcstat --servers=127.0.0.1

sumber : devdocs.magento.com/guides/v2.4/config-guide/memcache/memcache_ubuntu.html