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systemctl | grep rpc
  run-rpc_pipefs.mount                                                                             loaded active mounted   /run/rpc_pipefs
  rpcbind.service                                                                                  loaded active running   LSB: RPC portmapper replacement
  rpcbind.target                                                                                   loaded active active    RPC Port Mapper

journalctl | grep '\(rpc\|nfs\)'
lis 09 16:51:09 server.in.firma.cz nfs-kernel-server[1217]: Exporting directories for NFS kernel daemon...exportfs: /etc/exports [1]: Neither 'subtree_check' or 'no_subtree_check' specified for export "srbt.in.firma.cz:/home/srb".
lis 09 16:51:09 server.in.firma.cz nfs-kernel-server[1217]: Assuming default behaviour ('no_subtree_check').
lis 09 16:51:09 server.in.firma.cz nfs-kernel-server[1217]: NOTE: this default has changed since nfs-utils version 1.0.x
lis 09 16:51:09 server.in.firma.cz nfs-kernel-server[1217]: .
lis 09 16:51:09 server.in.firma.cz kernel: NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
lis 09 16:51:09 server.in.firma.cz rpc.mountd[1241]: Version 1.2.8 starting
lis 09 16:51:09 server.in.firma.cz nfs-kernel-server[1217]: Starting NFS kernel daemon: nfsd mountd.
lis 09 16:51:22 server.in.firma.cz kernel: nfsd: nfsv4 idmapping failing: has idmapd not been started?

root@server:~ # rpc.idmapd -f -vvv
rpc.idmapd: libnfsidmap: using (default) domain: in.firma.cz
rpc.idmapd: libnfsidmap: Realms list: 'IN.FIRMA.CZ' 
rpc.idmapd: libnfsidmap: processing 'Method' list
rpc.idmapd: libnfsidmap: loaded plugin /lib/x86_64-linux-gnu/libnfsidmap/static.so for method static

rpc.idmapd: libnfsidmap: processing 'GSS-Methods' list
rpc.idmapd: libnfsidmap: loaded plugin /lib/x86_64-linux-gnu/libnfsidmap/static.so for method static

rpc.idmapd: Expiration time is 600 seconds.
rpc.idmapd: Opened /proc/net/rpc/nfs4.nametoid/channel
rpc.idmapd: Opened /proc/net/rpc/nfs4.idtoname/channel

(provedl jsem ls -l na klientovi)

rpc.idmapd: nfsdcb: authbuf=srbt.in.firma.cz authtype=user
rpc.idmapd: nfs4_uid_to_name: final return value is 0

rpc.idmapd: Server : (user) id "10035" -> name ""
rpc.idmapd: nfsdcb: authbuf=srbt.in.firma.cz authtype=group
rpc.idmapd: nfs4_gid_to_name: final return value is 0

rpc.idmapd: Server : (group) id "513" -> name ""