So I have an environmentfile containing two variable definitions:

RUNASUSER=nobody
MEM=4294967296

And my service section reads:

[Service]
EnvironmentFile=/path/myfile
User=$RUNASUSER
LimitMEMLOCK=$MEM

This service failes to startup, as I cannot seem to being able to use a variable for the User attribute, but I may very well for LimitMEMLOCK.

Error:

Failed to determine user credentials: No such process


And if specifying instead:

[Service]
EnvironmentFile=/path/myfile
User=nobody
LimitMEMLOCK=$MEM

Everything does work. And I am wondering, why? And moreover, is there any source of documentation, that lists or even explains, what attributes may have a variable as an argument and what do not?

As for instances/template units it would be really helpful to being able to set the running user in the configuration/environment file. Or at least have a knowledge of those settings, that do not allow this, for what reason ever. Especially when talking about directory settings.

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