MOUNTD(8) BSD System Manager's Manual MOUNTD(8)
mountd -- service remote NFS mount requests
mountd [-2delnorS] [-h bindip] [-p port] [exportsfile ...]
The mountd utility is the server for NFS mount requests from other client machines. It lis-
tens 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, 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 The new NFS server that includes NFSv4 support is now the default, so this option is
now a no-op and should be considered deprecated.
Specify specific IP addresses to bind to for TCP and UDP requests. 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 automati-
cally 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.nfsrv.nfs_privport sysctl flag, which controls if the kernel will accept NFS
requests from reserved ports only.
-o This flag forces the system to run the old NFS server, which does not have NFSv4
support in it.
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 Allow mount RPCs requests for regular files to be served. Although 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 swap-
files resides will have to be exported with the -alldirs flag.
Specify an alternate location for the exports file. More than one exports file can
-S Tell mountd to suspend/resume execution of the nfsd threads whenever the exports
list is being reloaded. This avoids intermittent 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 exports 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, using kldload(2). If this fails, or no
NFS KLD was available, mountd exits with an error.
/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
nfsstat(1), kldload(2), nfsv4(4), exports(5), nfsd(8), rpcbind(8), showmount(8)
The mountd utility first appeared in 4.4BSD.
BSD October 14, 2012 BSD