> official way is to copy the unit file to /etc/systemd/system and edit > this copy. that's one way to do it. It has the disadvantage of overriding *all* settings in the vendor-supplied unit files, which may be changed or extended in later releases. I prefer the other supported way (see <https://www.freedesktop.org/software/systemd/man/systemd.unit.html>): 1. Create a directory named after the unit in /etc/systemd/system, /etc/systemd/system/httpd.service.d/ 2. Create an override file within that directory, for instance private-tmp.conf, with the following contents: [Service] PrivateTmp=false 3. Run "systemd daemon-reload" and "systemd restart httpd" You can verify that the override file has been loaded with > [root at master1 ~]# systemctl status httpd > ● httpd.service - The Apache HTTP Server > Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled) > Drop-In: /etc/systemd/system/httpd.service.d > └─private-tmp.conf This will override only the setting you want to override and still survive updates.