autofsd, autofs - Automatically and transparently mounts
and unmounts NFS file systems
/usr/sbin/autofsd [-dv] [-D name=value] [directory -null]
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. Logs verbose output. Defines an autofsd environment
variable by assigning value to the variable. 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
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
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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