In this brief guide we will be going over how to install and secure memcached daemon for a cPanel(Centos) server. See here for more about memcached.

To install memcached we first need to install the below required rpm packages as root.

yum install memcached libmemcached-devel -y

We now need to make one minor edit to the configuration file to ensure that the memcached daemon is only accessible from localhost. This prevents external malicious attacks against your memcached daemon.

Open up the configuration file by using the below command.

nano /etc/sysconfig/memcached


Find the last line where it shows: OPTIONS=”” and change it to the below. and save and exit.

OPTIONS="-U 0 -l"

Here is a one-liner to fix that via sed.

sed -i 's/^OPTIONS.*/OPTIONS="-U 0 -l"/g' /etc/sysconfig/memcached

Now we can enable and start the memcached service. Use the below commands to enable and start.

systemctl enable memcached;systemctl start memcached;

We can now check the status with the below commands via systemd or via checking for the process.

systemctl status memcached
ps -eaf | grep memcached

Now that the memcached daemon is installed and configured we can then install the PHP extensions for our installed versions of PHP.

So for PHP 7.0, 7.1, 7.2, and PHP 7.3. the below commands will install for all those versions. The beginning “printf ‘\n’ |” just auto accepts the defaults. No configuring or special things are needed this way.

printf ‘\n’ | /opt/cpanel/ea-php70/root/usr/bin/pecl install memcached
printf ‘\n’ | /opt/cpanel/ea-php71/root/usr/bin/pecl install memcached
printf ‘\n’ | /opt/cpanel/ea-php72/root/usr/bin/pecl install memcached
printf ‘\n’ | /opt/cpanel/ea-php73/root/usr/bin/pecl install memcached

Now that the PHP extensions are installed we need to restart Apache httpd service so they are loaded. Both versions of how to restart the process.

service httpd restart
systemctl restart httpd 

Once installed you can check all versions of PHP for memcached php extension with the below command.

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

If everything went well you will be able to see output like the below showing memcached is installed for all the PHP versions you selected.

[root@gcloud /]# for phpver in $(ls -1 /opt/cpanel/ |grep ea-php | sed 's/ea-php//g') ; do
> echo "PHP $phpver" ; /opt/cpanel/ea-php$phpver/root/usr/bin/php -m |grep memcached;
> done
PHP 70
PHP 71
PHP 72
PHP 73
[root@gcloud /]#

There you have it the easiest way to install memcached daemon and php for all versions of PHP 7 without all sorts of workarounds needed.

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