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Commands Reference, Volume 3
Provides the remote print server
on a network.
lpd [ -d ] [ -l ] [ -D DebugOutputFile]
The lpd daemon is the
remote print server. It monitors port 515 for print requests.
Each request is placed in a directory named /var/spool/lpd.
A computer on a network (host)
that can create a Transmission Control Protocol/Internet Protocol (TCP/IP)
data stream and use the lpd protocol can print remotely or act as a
print server. As a security feature, the lpd daemon accepts
print requests only from remote hosts that are listed in the local
/etc/hosts.equiv or /etc/hosts.lpd
file.
The lpd daemon can run
on any host in the network; its function is to accept print requests from
foreign hosts (on port 515). The lpd daemon handles each
request by forking a child process. Remote requests are first checked
against the /etc/hosts.equiv and
/etc/hosts.lpd files for permission to print on the local
host.
Changes can be made to the
/etc/hosts.equiv and /etc/hosts.lpd files
without restarting the system. To put changes to these files into
effect without restarting the system, use the System Resource Controller (SRC)
refresh command. This command causes the
/etc/hosts.equiv and /etc/hosts.lpd
database files to be reloaded and the changes implemented.
Note: The queuing
system does not support multibyte host names.
The /etc/locks/lpd file
contains the process ID of the currently running instance of the
lpd daemon. If the current machine becomes inoperable, you
may need to remove the ID for the lpd daemon when the system starts
up again. The error message displayed is lpd: lock file or
duplicate daemon.
The lpd daemon is a
subsystem controlled by the System Resource Controller (SRC). The
lpd daemon is a member of the TCP/IP system group.
Use the following SRC commands to
manipulate the lpd daemon:
| startsrc
| Starts a subsystem, group of subsystems, or a subserver.
|
| stopsrc
| Stops a subsystem, group of subsystems, or a subserver.
|
| refresh
| Causes the subsystem or group of subsystems to reread the appropriate
configuration file.
|
| traceson
| Enables tracing of a subsystem, group of subsystems, or a
subserver.
|
| tracesoff
| Disables tracing of a subsystem, group of subsystems, or a
subserver.
|
| lssrc
| Gets the status of a subsystem, group of subsystems, or a
subserver.
|
| -d
| Sends a status of Inactive to be logged with the SRC controller and sends
error messages during socket communication setup failures to the user
display.
|
| -l
| Sends a status of Active to be logged with the SRC controller and sends
valid or invalid job request messages to the user display.
|
| -D
DebugOutputFile
| Sends extensive debugging output used for problem determination to the
file specified by DebugOuputFile. This should only be used
during problem determination as the DebugOuputFile can grow large
rapidly. If the output file specified already exists, new debugging
output is appended to the end of it. If there are any problems creating
or writing to the output file, the debugging option is ignored.
|
- To start the lpd
server daemon, enter:
startsrc -s lpd
- To start the lpd
server daemon while enabling the display of certain error messages,
enter:
startsrc -s lpd -a " -d"
- To send logging information
to the stderr daemon, enter:
startsrc -s lpd -a " -l"
- To start the
lpd server daemon in debugging mode with output going to
/tmp/dbglpd.out, enter:
startsrc -s lpd -a " -D /tmp/dbglpd.out"
| /usr/sbin/lpd
| Specifies the path to the lpd daemon.
|
| /dev/lp*
| Contains the names of print devices.
|
| /etc/hosts.equiv
| Contains the names of hosts allowed to execute commands and print.
|
| /etc/hosts.lpd
| Contains the names of hosts allowed to print only.
|
| /var/spool/lpd
| Contains the spool directory for control, status, and data files.
|
| /etc/locks/lpd
| Contains the PID of the currently running lpd daemon.
After a system crash, this PID may need to be deleted. The following
error message indicates the problem:
lpd: lock file or duplicate daemon
|
Using the lpd
Remote Subsystem in the AIX 5L Version 5.1 Guide to Printers
and Printing.
Remote Printing
Overview in the AIX 5L Version 5.1 Guide to Printers and
Printing.
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