Installing Memcached

Installing PHP extension

sudo apt-get install -y php8.1-memcached

sudo systemctl restart apache2

Installing Memcached

sudo apt update

sudo apt-get install -y memcached libmemcached-tools

sudo systemctl start memcached
sudo systemctl enable memcached

sudo systemctl restart apache2

Verify that Memcached is currently bound to the local IPv4 127.0.0.1 interface and listening only for TCP connections by using the ss command:

sudo ss -plunt

You should receive output like the following:

Output
Netid      State       Recv-Q      Send-Q           Local Address:Port             Peer Address:Port      Process                                         
. . .
tcp        LISTEN      0           1024                 127.0.0.1:11211                 0.0.0.0:*          users:(("memcached",pid=8889,fd=26))
. . .