[defect]: systemd service using deprecated MemoryLimit directive

[ablanken]

What type of defect/bug is this?

Unexpected behaviour (obvious or verified by project member)

How can the issue be reproduced?

The MemoryLimit directive (referenced below) has been deprecated on systems running systemd starting from version 228 (e.g. RHEL8+, Debian 9+).

On these systems, it's recommended to use MemoryMax instead. This isn't a priority as MemoryLimit is still functional on modern systems but worth noting as it may stop being effective at some point.

Unfortunately, the recommended directive isn't available on older operating systems. Potential solutions could include replacing the config line as appropriate during installation or maintaining separate service files for each OS version.

ref:
https://github.com/FreeRADIUS/freeradius-server/blob/master/redhat/radiusd.service
https://github.com/FreeRADIUS/freeradius-server/blob/master/debian/freeradius.service

Log output from the FreeRADIUS daemon

n/a

Relevant log output from client utilities

No response

Backtrace from LLDB or GDB

No response