How do i change property values for a systemd service?

pangolinsos

Also see: How do i display the all systemd manager properties?

set-property option of systemctl.

       set-property NAME ASSIGNMENT...
           Set the specified unit properties at runtime where this is
           supported. This allows changing configuration parameter properties
           such as resource control settings at runtime. Not all properties
           may be changed at runtime, but many resource control settings
           (primarily those in systemd.resource-control(5)) may. The changes
           are applied instantly, and stored on disk for future boots, unless
           --runtime is passed, in which case the settings only apply until
           the next reboot. The syntax of the property assignment follows
           closely the syntax of assignments in unit files.

           Example: systemctl set-property foobar.service CPUShares=777

           Note that this command allows changing multiple properties at the
           same time, which is preferable over setting them individually. Like
           unit file configuration settings, assigning the empty list to list
           parameters will reset the list.

Note: It does mention no all properties can be changed at runtime.

To set the CPUShares of the httpd service. Note, This is just random figure to demonstrate the command. The change will be made permanently to the unit file; to make it a temporary change add the --runtime option.

$ sudo systemctl set-property httpd.service CPUShares=1000

Verify the setting.

$ systemctl show httpd.service -p CPUShares
CPUShares=1000

Note: When working with unit files manually, there are some other steps involved these are not explained as part of this article.