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MOUNTD(8) |
FreeBSD System Manager's Manual |
MOUNTD(8) |
mountd —
service remote NFS mount requests
mountd |
[-2delnRrS ] [-h
bindip] [-p
port] [exportsfile ...] |
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 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
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 reserved 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. 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
-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 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
The mountd utility first appeared in
4.4BSD.
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