rpc.mountd - NFS mount daemon
SYNOPSIS
/usr/sbin/rpc.mountd [options]
DESCRIPTION
The rpc.mountd program implements the NFS mount protocol.
When receiving a MOUNT request from an NFS client, it
checks the request against the list of currently exported
file systems. If the client is permitted to mount the file
system, rpc.mountd obtains a file handle for requested
directory and returns it to the client.
Exporting NFS File Systems
Making file systems available to NFS clients is called
exporting.
Usually, a file system and the hosts it should be made
available to are listed in the /etc/exports file, and
invoking exportfs -a whenever the system is booted. The
exportfs(8) command makes export information available to
both the kernel NFS server module and the rpc.mountd dae
mon.
Alternatively, you can export individual directories tem
porarily using exportfs's host:/directory syntax.
The rmtab File
For every mount request received from an NFS client,
rpc.mountd adds an entry to the /var/lib/nfs/rmtab file.
When receiving an unmount request, that entry is removed.
user level part of the NFS service.
However, this file is mostly ornamental. One, the client
can continue to use the file handle even after calling
rpc.mountd 's UMOUNT procedure. And two, if a client
reboots without notifying rpc.mountd , a stale entry will
remain in rmtab.
OPTIONS
-d kind or --debug kind
Turn on debugging for kind.
-F or --foreground
Run in foreground (do not daemonize)
-f or --exports-file
This option specifies the exports file, listing the
clients that this server is prepared to serve and
parameters to apply to each such mount (see
exports(5)). By default, export information is
read from /etc/exports.
Display usage message.
-o num or --descriptors num
Set the limit of the number of open file descrip
tors to num. The default is 256.
-N or --no-nfs-version
This option can be used to request that rpc.mountd
do not offer certain versions of NFS. The current
version of rpc.mountd can support both NFS version
2 and the newer version 3. If the NFS kernel module
was compiled without support for NFSv3, rpc.mountd
must be invoked with the option --no-nfs-version 3
.
-n or --no-tcp
Don't advertise TCP for mount.
-P Ignored (compatibility with unfsd??).
-p or --port num
Force rpc.mountd to bind to the specified port num,
instead of using the random port number assigned by
the portmapper.
-V or --nfs-version
This option can be used to request that rpc.mountd
offer certain versions of NFS. The current version
of rpc.mountd can support both NFS version 2 and
the newer version 3.
-v or --version
Print the version of rpc.mountd and exit.
TCP_WRAPPERS SUPPORT
This rpc.mountd version is protected by the tcp_wrapper
library. You have to give the clients access to rpc.mountd
if they should be allowed to use it. To allow connects
from clients of the .bar.com domain you could use the fol
lowing line in /etc/hosts.allow:
mountd: .bar.com
You have to use the daemon name mountd for the daemon name
(even if the binary has a different name).
For further information please have a look at the tcpd(8)
and hosts_access(5) manual pages.
SEE ALSO
rpc.nfsd(8), exportfs(8), exports(5), rpc.rquotad(8).
/etc/exports, /var/lib/nfs/xtab.
AUTHOR
Olaf Kirch, H. J. Lu, G. Allan Morris III, and a host of
others.
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