Stop systemd from creating directories for apache in /var/tmp

# vi /etc/systemd/system/apache2.service
PrivateTmp=true ==> PrivateTmp=false

Reference: https://www.freedesktop.org/software/systemd/man/systemd.exec.html#PrivateTmp=

ln -s /lib/systemd/system/apache2.service  /etc/systemd/system/apache2.service