https://www.kernel.org/doc/Documentation/filesystems/nfs/idmapper.txt states:
The file /etc/request-key.conf will need to be modified so /sbin/request-key can
direct the upcall. The following line should be added:
#OP TYPE DESCRIPTION CALLOUT INFO PROGRAM ARG1 ARG2 ARG3 ...
#====== ======= =============== =============== ===============================
create id_resolver * * /usr/sbin/nfs.idmap %k %d 600
This will direct all id_resolver requests to the program /usr/sbin/nfs.idmap.
This entry does not exist in request-key.conf as of Ubuntu 12.04. I have seen several different conflicting reports about this:
- nfs.idmap upcall is obsolete and rpc.idmapd should be used instead
- rpc.idmapd is obsolete and nfs.idmap should be used instead
- The kernel automatically juggles between the two (which does it prefer?)
Can anyone shed any light on this?
Thanks.