There are some additional variables to be set in /etc/default/nfs-kernel-server
NFS_HOSTNAME="servername"
RQUOTAD_PORT=598 LOCKD_UDPPORT=599 LOCKD_TCPPORT=599 STATD_PORT=595 STATD_OUTGOING_PORT=596 STATD_HOSTNAME="$NFS_HOSTNAME"
There are some additional variables to be set in /etc/default/ nfs-kernel- server
NFS_HOSTNAME= "servername"
RQUOTAD_PORT=598 PORT=596 "$NFS_HOSTNAME"
LOCKD_UDPPORT=599
LOCKD_TCPPORT=599
STATD_PORT=595
STATD_OUTGOING_
STATD_HOSTNAME=