10-30-2016
I think the /share in the previous post is the exported(=shared) directory on the NFS server. The given /share line is not a command; it is an entry in the /etc/exports file. The command exportfs -av activates the lines in the exports file.
On the NFS client(s) the mount command mounts the server's exported share to a local directory. Then all files in the mounted directory are located on the NFS server.
The export works on host(ip, network) level. Once mounted, the file owner and permissions decide on UID/GID level, just like the local files.
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LEARN ABOUT REDHAT
mountd
rpc.mountd(8) System Manager's Manual rpc.mountd(8)
NAME
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
daemon.
Alternatively, you can export individual directories temporarily 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 proce-
dure. 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.
-h or --help
Display usage message.
-o num or --descriptors num
Set the limit of the number of open file descriptors 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 sup-
port 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 following 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).
FILES
/etc/exports, /var/lib/nfs/xtab.
AUTHOR
Olaf Kirch, H. J. Lu, G. Allan Morris III, and a host of others.
25 Aug 2000 rpc.mountd(8)