MOUNTD(8)		FreeBSD	System Manager's Manual		     MOUNTD(8)

NAME
     mountd -- service remote NFS mount	requests

SYNOPSIS
     mountd [-2delnRrS]	[-h bindip] [-p	port] [exportsfile ...]

DESCRIPTION
     The mountd	utility	is the server for NFS mount requests from other	client
     machines.	It listens for service requests	at the port indicated in the
     NFS server	specification; see Network File	System Protocol	Specification,
     RFC1094, Appendix A and NFS: Network File System Version 3	Protocol
     Specification, RFC1813, Appendix I.

     The following options are available:

     -2	     Allow the administrator to	force clients to use only the version
	     2 NFS protocol to mount file systems from this server.

     -d	     Output debugging information.  mountd will	not detach from	the
	     controlling terminal and will print debugging messages to stderr.

     -e	     Ignored; included for backward compatibility.

     -h	bindip
	     Specify specific IP addresses to bind to for TCP and UDP re-
	     quests.  This option may be specified multiple times.  If no -h
	     option is specified, mountd will bind to INADDR_ANY.  Note	that
	     when specifying IP	addresses with -h, mountd will automatically
	     add 127.0.0.1 and if IPv6 is enabled, ::1 to the list.

     -l	     Cause all succeeded mountd	requests to be logged.

     -n	     Allow non-root mount requests to be served.  This should only be
	     specified if there	are clients such as PC's, that require it.  It
	     will automatically	clear the vfs.nfsd.nfs_privport	sysctl flag,
	     which controls if the kernel will accept NFS requests from	re-
	     served ports only.

     -p	port
	     Force mountd to bind to the specified port, for both AF_INET and
	     AF_INET6 address families.	 This is typically done	to ensure that
	     the port which mountd binds to is a known quantity	which can be
	     used in firewall rulesets.	 If mountd cannot bind to this port,
	     an	appropriate error will be recorded in the system log, and the
	     daemon will then exit.

     -R	     Do	not support the	Mount protocol and do not register with
	     rpcbind(8).  This can be done for NFSv4 only servers, since the
	     Mount protocol is not used	by NFSv4.  Useful for NFSv4 only
	     servers that do not wish to run rpcbind(8).  showmount(8) will
	     not work, however since NFSv4 mounts are not shown	by
	     showmount(8), this	should not be an issue for an NFSv4 only
	     server.

     -r	     Allow mount RPCs requests for regular files to be served.	Al-
	     though this seems to violate the mount protocol specification,
	     some diskless workstations	do mount requests for their swapfiles
	     and expect	them to	be regular files.  Since a regular file	cannot
	     be	specified in /etc/exports, the entire file system in which the
	     swapfiles resides will have to be exported	with the -alldirs
	     flag.

     exportsfile
	     Specify an	alternate location for the exports file.  More than
	     one exports file can be specified.

     -S	     Tell mountd to suspend/resume execution of	the nfsd threads when-
	     ever the exports list is being reloaded.  This avoids intermit-
	     tent access errors	for clients that do NFS	RPCs while the exports
	     are being reloaded, but introduces	a delay	in RPC response	while
	     the reload	is in progress.	 If mountd crashes while an exports
	     load is in	progress, mountd must be restarted to get the nfsd
	     threads running again, if this option is used.

     When mountd is started, it	loads the export host addresses	and options
     into the kernel using the mount(2)	system call.  After changing the ex-
     ports file, a hangup signal should	be sent	to the mountd daemon to	get it
     to	reload the export information.	After sending the SIGHUP (kill -s HUP
     `cat /var/run/mountd.pid`), check the syslog output to see	if mountd
     logged any	parsing	errors in the exports file.

     If	mountd detects that the	running	kernel does not	include	NFS support,
     it	will attempt to	load a loadable	kernel module containing NFS code, us-
     ing kldload(2).  If this fails, or	no NFS KLD was available, mountd exits
     with an error.

FILES
     /etc/exports	  the list of exported file systems
     /var/run/mountd.pid  the pid of the currently running mountd
     /var/db/mountdtab	  the current list of remote mounted file systems

SEE ALSO
     nfsstat(1), kldload(2), nfsv4(4), exports(5), nfsd(8), rpcbind(8),
     showmount(8)

HISTORY
     The mountd	utility	first appeared in 4.4BSD.

FreeBSD	13.0		       October 11, 2020			  FreeBSD 13.0