grawity/systemd-arch-units — comment on commit 0db979478588da767a2ab790f79699a2cd1287b7
File: service/rpc-idmapd.service line 9
By grawity:

It does, which is why this patch only adjusts the ordering of services. The module is inserted automatically by nfsd.service on servers, and is not needed (I hope) on clients. However, on servers, if both nfsd.service and rpc-idmapd.service are started at the same time during boot, there is always a chance that idmapd will access /proc stuff before nfsd.ko is inserted. (Besides, pretty much all nfsd.service does is insert a module, it's not a real userspace daemon.)

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Mantas M.