MOUNTD(8) | System Manager's Manual | MOUNTD(8) |
NAME¶
mountd
— service
remote NFS mount requests
SYNOPSIS¶
mountd |
[-2delnorS ] [-h
bindip] [-p
port] [exportsfile ...] |
DESCRIPTION¶
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, 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.
-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 toINADDR_ANY
. Note that when specifying IP addresses with-h
,mountd
will automatically add127.0.0.1
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.
-p
port- Force
mountd
to bind to the specified port, for bothAF_INET
andAF_INET6
address families. This is typically done to ensure that the port whichmountd
binds to is a known quantity which can be used in firewall rulesets. Ifmountd
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
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.
FILES¶
- /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
SEE ALSO¶
nfsstat(1), kldload(2), nfsv4(4), exports(5), nfsd(8), rpcbind(8), showmount(8)
HISTORY¶
The mountd
utility first appeared in
4.4BSD.
October 14, 2012 | Debian |