[systemd-devel] Setting Environment Configuration (Affinity) for Slices

[Chris Bell]

Hi all,

Is there a way to set an affinity for an entire slice? Say, for example, 
I have system-webhosted.slice, but I only want the services running 
within system-webhosted.slice to run on cores 5-8. I can set this 
individually per service (systemd.exec man page), but it does not 
indicate that I can do this for slices. Also, the systemd.slice man page 
says it only accepts resource control directives, not environment config 
directives. Is there any way I can set an environment config directive 
for an entire slice? Or do I need to do it per-service?

Alternatively, is there a way (and this sounds way too hacky) to 
hierarchically order a slice under a service? So, basically I can start 
some dummy service with environment configs, and the slice will be a 
child of that service and all units in that slice will inherit the 
environment configs from the parent of the slice?

/
└─system.slice
   └─dummy-slice-wrapper.service
     └─system-webhosted.slice
       ├─httpd.service
       └─postgresql.service

Where dummy-slice-wrapper.service has affinity set to 5-8 and has 
system-webhosted.slice as a child. Then the services inside the slice 
(httpd, postgre) also have their affinity locked to 5-8, without having 
to specify it with an override for each service.

I've noticed that systemd-nspawn@<machine>.servce has a child 
'system.slice' though I don't know if that setup can enforce what I'd 
like it to.

Is there any way to do this with the current setup?

Thanks in advance!!

--Chris