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Operating Systems AIX Basic AIX Print Queue Questions Post 302078110 by alexop on Wednesday 28th of June 2006 05:26:56 AM
Old 06-28-2006
What causes a print queue to go down?

Morning, All

I've been doing some work on AIX print queues, troubleshooting some underlying issues we've been having. In the process of this I've uncovered some potential gaps in our knowledge. Our typical setup is remote impact printers (In this case OKIML5520s, with NICs) and local queues and devices set up like this (scripted setup so they're all essentially the same);

0020pa01:
device = @0020pa01
up = TRUE
host = 0020pa01
s_statfilter = /usr/lib/lpd/bsdshort
l_statfilter = /usr/lib/lpd/bsdlong
rq = lp
@0020pa01:
backend = /usr/lib/lpd/rembak -T7200

Our belief was that by passing the option '-T7200' to rembak this would mean the queue would stay UP for 5 days in the event of problems with the remote device. Reading the man page for rembak it seems this assumption may have been a little wide of the mark.... Further tests have proved this to be incorrect.

So, my question is, in this instance, what is causing the print queues to go down? Obviously this causes us lots of problems, generating help-desk calls etc.

Many thanks,

Alex

Last edited by alexop; 06-28-2006 at 12:30 PM..
 

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cups-lpd(8)							    Apple Inc.							       cups-lpd(8)

NAME
cups-lpd - receive print jobs and report printer status to lpd clients SYNOPSIS
cups-lpd [ -h hostname[:port] ] [ -n ] [ -o option=value ] DESCRIPTION
cups-lpd is the CUPS Line Printer Daemon ("LPD") mini-server that supports legacy client systems that use the LPD protocol. cups-lpd does not act as a standalone network daemon but instead operates using the Internet "super-server" inetd(8) or xinetd(8). If you are using inetd, add the following line to the inetd.conf file to enable the cups-lpd mini-server: printer stream tcp nowait lp /usr/lib/cups/daemon/cups-lpd cups-lpd -o document-format=application/octet-stream Note: If you are using Solaris 10 or higher, you must run the inetdconv(1m) program to register the changes to the inetd.conf file. If you are using the newer xinetd(8) daemon, create a file named /etc/xinetd.d/cups containing the following lines: service printer { socket_type = stream protocol = tcp wait = no user = lp group = sys passenv = server = /usr/lib/cups/daemon/cups-lpd server_args = -o document-format=application/octet-stream } OPTIONS
-h hostname[:port] Sets the CUPS server (and port) to use. -n Disables reverse address lookups; normally cups-lpd will try to discover the hostname of the client via a reverse DNS lookup. -o name=value Inserts options for all print queues. Most often this is used to disable the "l" filter so that remote print jobs are filtered as needed for printing; the examples in the previous section set the "document-format" option to "application/octet-stream" which forces autodetection of the print file format. PERFORMANCE
cups-lpd performs well with small numbers of clients and printers. However, since a new process is created for each connection and since each process must query the printing system before each job submission, it does not scale to larger configurations. We highly recommend that large configurations use the native IPP support provided by CUPS instead. SECURITY
cups-lpd currently does not perform any access control based on the settings in cupsd.conf(5) or in the hosts.allow(5) or hosts.deny(5) files used by TCP wrappers. Therefore, running cups-lpd on your server will allow any computer on your network (and perhaps the entire Internet) to print to your server. While xinetd has built-in access control support, you should use the TCP wrappers package with inetd to limit access to only those comput- ers that should be able to print through your server. cups-lpd is not enabled by the standard CUPS distribution. Please consult with your operating system vendor to determine whether it is enabled on your system. COMPATIBILITY
cups-lpd does not enforce the restricted source port number specified in RFC 1179, as using restricted ports does not prevent users from submitting print jobs. While this behavior is different than standard Berkeley LPD implementations, it should not affect normal client operations. The output of the status requests follows RFC 2569, Mapping between LPD and IPP Protocols. Since many LPD implementations stray from this definition, remote status reporting to LPD clients may be unreliable. SEE ALSO
cups(1), cupsd(8), inetconv(1m), inetd(8), xinetd(8), http://localhost:631/help COPYRIGHT
Copyright 2007-2011 by Apple Inc. 4 August 2008 CUPS cups-lpd(8)
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