Hej!
-----John Hupp <l...@prpcompany.com> skrev: ----- Till: ltsp-discuss@lists.sourceforge.net Från: John Hupp <l...@prpcompany.com> Datum: 2015-05-02 20:40 Ärende: Re: [Ltsp-discuss] Fat clients can't use printer/scanner connected to server > -----John Hupp <l...@prpcompany.com> skrev: ----- > Till: ltsp-discuss@lists.sourceforge.net > Från: John Hupp <l...@prpcompany.com> > Datum: 2015-04-30 23:52 > Ärende: [Ltsp-discuss] Fat clients can't use printer/scanner connected to > server > > Running LTSP-PNP with Lubuntu 14.04.2, I have thin clients running smoothly. > > But with a fat client, Simple Scan reports "No scanners detected." And > System Tools: Printers reports "Printing service not available. Start > the service on this computer or connect to another server." > > In lts.conf, I have: > SCANNER=True > LDM_PRINTER_DEFAULT="EPSON-Stylus-C120" > > On the server, System Tools: Printers reports that the Epson is Shared. > > The logged in user has permission to use scanners. > > The cupsd process is running on the client. > > Do fat clients need avahi-daemon to detect these peripherals? Or does > anyone otherwise recognize the issue? > > > > > On 5/1/2015 2:23 AM, Johan Kragsterman wrote: > > I run edubuntu 14.4 with 4 different chroot's. I don't know about scanners, > but printers I configura with editing cups-browsed.conf and adding your own > printers.conf. I never touch lts.conf. > > > Rgrds Johan > Continuing for the moment to work just on the printing question, the "Printing service not available" message went away after I ran (on the server) system-config-printer and under Server: Settings checked "Publish shared printers connected to this system" and then updated the image. But there are still no printers showing up on the fat client when I run system-config-printer there, and I see that in the image printers.conf has no content except 3 lines of comments. The content is apparently stripped during an image update. So even if I were to set up a network printer on the server (for the printer connected to the server), that configuration would be stripped during an image update and so not propagated to the fat client. @ Johan: If the above is true, how do you then add your own printers.conf? Here's how it looks like in my fat clients filesystem: admin@ws0:/etc/cups$ ls cups-browsed.conf ppd raw.types subscriptions.conf.O cupsd.conf printers.conf snmp.conf cups-files.conf printers.conf.O ssl interfaces raw.convs subscriptions.conf admin@ws0:/etc/cups$ As you can see, I got all the normal cups files there, I don't know if there is a different with the ltsp-pnp. I didn't build my chroot's with any special options. As you also can see, I got both printers.conf and printers.conf.0. The latter is the one that cups is building automatically, and it is named like that, because the printers.conf already exists. Here's my cups-browsed.conf: admin@ws0:/etc/cups$ cat cups-browsed.conf # Which protocols will we use to discover printers on the network? # Can use DNSSD and/or CUPS, or 'none' for neither. BrowseRemoteProtocols dnssd cups # Which protocols will we use to broadcast shared local printers to the network? # Can use DNSSD and/or CUPS, or 'none' for neither. # Only CUPS is actually supported, as DNSSD is done by CUPS itself (we ignore # DNSSD in this directive). # BrowseLocalProtocols none # Settings of this directive apply to both BrowseRemoteProtocols and # BrowseLocalProtocols. # Can use DNSSD and/or CUPS, or 'none' for neither. BrowseProtocols dnssd cups # Only browse remote printers from selected servers # BrowseAllow cups.example.com BrowseAllow 192.168.10.250 BrowseAllow 192.168.10.0/24 BrowseAllow 192.168.10.0/255.255.255.0 # Use BrowsePoll to poll a particular CUPS server BrowsePoll 192.168.10.250:631 BrowsePoll 192.168.10.250 # BrowsePoll cups.example.com:631/version=1.1 # Use DomainSocket to access the local CUPS daemon via another than the # default domain socket # DomainSocket /var/run/cups/cups.sock # Set CreateIPPPrinterQueues to "Yes" to let cups-browsed discover IPP # network printers (native printers, not CUPS queues) with known page # description languages (PWG Raster, PDF, PostScript, PCL XL, PCL # 5c/e) in the local network and auto-create PPD-less print queues for # them (using a System V interface script to control the filter # chain). Clients have to IPP-poll the capabilities of the printer and # send option settings as standard IPP attributes. We do not poll the # capabilities by ourselves to not wake up the printer from # power-saving mode when creating the queues. Jobs have to be sent in # PDF format. Other formats are not accepted. This functionality is # primarily for mobile devices running CUPS to not need a printer # setup tool nor a collection of printer drivers and PPDs. CreateIPPPrinterQueues Yes # The AutoShutdown directive specifies whether cups-browsed should # automatically terminate when it has no local raw queues set up # pointing to any discovered remote printers (auto shutdown # mode). Setting it to "On" activates the auto-shutdown mode, setting # it to "Off" deactiivates it (the default). The special mode "avahi" # turns auto shutdown off while avahi-daemon is running and on when # avahi-daemon stops. This allows running cups-browsed on-demand when # avahi-daemon is run on-demand. # AutoShutdown Off # AutoShutdown On # AutoShutdown avahi # The AutoShutdownTimeout directive specifies after how many seconds # without local raw queues set up pointing to any discovered remote # printers cups-browsed should actually shut down in auto shutdown # mode. Default is 30 seconds, 0 means immediate shutdown. # AutoShutdownTimeout 30 # Unknown directives are ignored, also unknown values. admin@ws0:/etc/cups$ And here's my printers.conf: admin@ws0:/etc/cups$ sudo cat printers.conf [sudo] password for admin: # Printer configuration file for CUPS v1.7.2 # Written by cupsd # DO NOT EDIT THIS FILE WHEN CUPSD IS RUNNING <Printer HP-Color-LaserJet-CP4520-Series> UUID urn:uuid:21be3120-0f61-3fa8-7d7d-7129f1350fab Info HP Color LaserJet CP4520 Series [90D6CD] Location print DeviceURI ipp://print.local:631/print PPDTimeStamp * State Idle StateTime 1430565618 Type 4 Accepting Yes Shared No ColorManaged Yes JobSheets none none QuotaPeriod 0 PageLimit 0 KLimit 0 OpPolicy default ErrorPolicy retry-job Option cups-browsed true </Printer> admin@ws0:/etc/cups$ I got this file through first editing cups-browsed, so that I could configure the exact printer I wanted, and then copy the file from my running fat client, and putting it into the chroot(and of coarse rebuilding the image). You will also need a root user in the fat client image. Regards Johan Neither the server nor the image has an existing cups-browsed.conf, though from the manpage it seems that it may not be necessary. If I understand it correctly, there are defaults for the values that probably allow things to just work in many/most circumstances. Is there a how-to for setting up server-connected printers for fat clients, or can someone explain how? ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net
