Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
NFSCBD(8)		FreeBSD	System Manager's Manual		     NFSCBD(8)

     nfscbd -- NFSv4 client side callback daemon

     nfscbd [-p	port_number] [-P client_principal]

     nfscbd runs on a client using NFSv4 to handle callback requests from the
     NFSv4 server.  If no nfscbd is running, NFSv4 mounts will still work, but
     the server	will never issue Open Delegations to the client.

     One callback server and one master	server are always started.

     The following options are available:

     -p	port_number
	     Specifies what port# the callback server should use.

     -P	client_principal
	     Specifies the host	based principal	name to	be used	as the target
	     for callbacks over	RPCSEC_GSS. For	KerberosV, it must be in the
	     client's default keytab file.  This client_principal should be
	     the same one specified by the gssname argument being used by
	     nfsv4 mounts.  If you do not specify this argument, callbacks
	     will still	work over AUTH_SYS, which is what many extant servers
	     use even for RPCSEC_GSS mounts, as	of 2009.

     For example, ``nfscbd -p 7654 -P root'' starts the	daemon to handle call-
     backs on port# 7654 and is	using the host based principal root@<client-
     host>.<dns-domain>	as the callback	target.

     nfscbd listens for	service	requests at the	port defined by	NFSV4_CBPORT
     in	/usr/include/fs/nfs/nfs.h, unless -p has been specified.  For more
     information on what callbacks and Open Delegations	do, see	Network	File
     System (NFS) Version 4 Protocol, RFC3530.

     The nfscbd	utility	exits 0	on success or >0 if an error occurred.

     nfsv4(4), mount_nfs(8)

     First introduced with the experimental nfs	client for NFSv4 support in

FreeBSD	11.0			April 25, 2009			  FreeBSD 11.0


Want to link to this manual page? Use this URL:

home | help