service remote NFS mount requests
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,
Appendix A and NFS: Network File System Version 3 Protocol
The following options are available:
- Allow the administrator to force clients to use only the version 2 NFS
protocol to mount file systems from this server.
- Output debugging information.
will not detach from the controlling terminal and will print debugging
messages to stderr.
- Ignored; included for backward compatibility.
- 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
mountd will automatically add
127.0.0.1 and if IPv6 is enabled,
::1 to the list.
- Cause all succeeded
mountd requests to
- 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 reserved ports only.
mountd to bind to the specified
port, for both
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
- 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 swapfiles resides will have to be exported with the
- Specify an alternate location for the exports file. More than one exports
file can be specified.
- 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
mountd must be restarted
to get the nfsd threads running again, if this option is used.
is started, it loads the export
host addresses and options into the kernel using the
system call. After changing the exports file, a hangup signal should be sent
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
logged any parsing errors in the
detects that the running kernel
does not include NFS support, it will attempt to load a loadable kernel module
containing NFS code, using
If this fails, or no NFS KLD was available,
exits with an error.
- the list of exported file systems
- the pid of the currently running mountd
- the current list of remote mounted file systems
utility first appeared in