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autofsd, autofs - Automatically and transparently mounts and unmounts NFS
/usr/sbin/autofsd [-dv] [-D name=value] [directory -null]
-d Enables debugging. When debugging is enabled, the daemon does not
disassociate itself from the current tty. Messages that trace autofsd
activity are written to standard output.
-v Logs verbose output.
Defines an autofsd environment variable by assigning value to the
Specifies the full pathname of the mount point for an indirect map
entry that is to be ignored.
You must specify excluded master map and direct map entries by using
the autofsmount command. See Special Maps in autofsmount(8).
The autofsd daemon automatically and transparently mounts and unmounts NFS
file systems on an as-needed basis. Like the automount daemon, it provides
another alternative to using the /etc/fstab file for mounting NFS file
systems on client machines. However, AutoFS is more efficient than the
automount daemon because it requires less communication between the kernel
and the user space daemon.
The autofsd daemon also provides higher availability than the automount
daemon. Although autofsd must be running for mounts or unmounts to be
performed, if it is killed or becomes unavailable, exisiting auto-mounted
NFS file systems continue to be available.
The autofsd daemon can be started from the command line or from the
/sbin/rc3.d/nfs script, which reads the /etc/rc.config.common file. Once
started, it remains dormant until a user attempts to access a directory (or
any file or directory in the directory hierarchy) that is associated with
an AutoFS map. The daemon then consults the appropriate map and mounts the
NFS file system as specified.
AutoFS maps indicate where to find the file system to be mounted and the
mount options to use. The names of the maps are passed to the autofsd
daemon through the autofsmount command. For more information about AutoFS
maps and the autofsmount command, see autofsmount(8) and the Network
Administration: Services manual. Also, see sys_attrs_autofs(5) for
information on tuning AutoFS.
The autofsmount program reads AutoFS maps at startup. If you make any
changes to the maps after startup, you must execute the autofsmount
command again to incorporate the changes.
By default, AutoFS uses UDP transport. If the tcp option is specified in a
map, AutoFS attempts to use TCP. If TCP is not available, AutoFS then
reverts to UDP.
There is no support in the autofsd daemon that is analogous to the SIGTERM
support in the automount command.
If a file system is locally served, the autofsd daemon creates a symbolic
link on the system instead of NFS mounting the directory. If locally
serving the directory would result in a circular link, the daemon selects
an external server (if available).
Commands: autofsmount(8), automount(8), mount(8)
Network Administration: Services
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