[cups] CUPS Disaster: printer queues going AOL or becoming disfunctional
Robert Heller
heller at deepsoft.com
Wed Aug 19 20:52:31 PDT 2015
OK, I solved this one:
The server is using LDAP (OpenLDAP) for user authentifcation. I *didn't* have
the 'system' accounts (uid/gid < 50) in the LDAP database, but they were in
/etc/passwd, /etc/group, and /etc/shadow and /etc/nsswitch.conf listed passwd,
shadow, and group as 'ldap files'. Appearently, cupsd wants the lp user and
group to be IN the LDAP database. I'm thinking cupsd is not handling or
understanding /etc/nsswitch.conf properly. When I added the lp user and lp
group to the LDAP database, cupsd properly reads in the printers.conf file --
the printer queues are up and working proper when cupsd is (re)started and I
don't need to re-configure the printers manually once cupsd is fired up.
I don't know if this is a bug or feature :-)
At Fri, 20 Mar 2015 16:36:38 -0400 Robert Heller <heller at deepsoft.com> wrote:
>
> At Fri, 20 Mar 2015 18:45:10 +0100 "The CUPS user discussion list." <cups at cups.org> wrote:
>
> >
> > You must modify the file context of printers.con to
> > cupsd_rw_etc_t
> > using the semanage context command (I suppose). The „rw“ is missing in your settings.
> >
> > Hope this helps (I cannot test it, as I haben’t a working SELinux installation at hand).
>
> OK, I used chcon to fix the context, and that gets rid of the permission
> denied error, but restarting the cups daemon still breaks the print queues.
>
> >
> > > Am 20.03.2015 um 18:20 schrieb Robert Heller <heller at deepsoft.com>:
> > >
> > > OK, I have pretty much isolated this problem. *Merely* restarting the cups
> > > daemon causes the printers to become disfunctional. Deleting and recreating
> > > the queues is the only appearent fix. I have turned on debug level logging,
> > > but I am not sure what I should be looking for to find the problem.
> > >
> > > Here is the log:
> > >
> > > I [20/Mar/2015:13:02:23 -0400] Scheduler shutting down normally.
> > > D [20/Mar/2015:13:02:23 -0400] Discarding unused server-stopped event...
> > > D [20/Mar/2015:13:02:23 -0400] cupsdDeregisterPrinter(p=0x7f2aa68545b0(BlackandWhiteLaserjet), removeit=1)
> > > D [20/Mar/2015:13:02:23 -0400] cupsdDeregisterPrinter(p=0x7f2aa6888bd0(BrotherColorLaser), removeit=1)
> > > D [20/Mar/2015:13:02:23 -0400] cupsdDeregisterPrinter(p=0x7f2aa6849980(Officejet_Color), removeit=1)
> > > I [20/Mar/2015:13:02:23 -0400] Saving job.cache...
> > > D [20/Mar/2015:13:02:23 -0400] [Job 2323] Unloading...
> > > D [20/Mar/2015:13:02:23 -0400] [Job 2324] Unloading...
> > > I [20/Mar/2015:13:02:24 -0400] Listening to 0.0.0.0:631 (IPv4)
> > > I [20/Mar/2015:13:02:24 -0400] Listening to :::631 (IPv6)
> > > I [20/Mar/2015:13:02:24 -0400] Listening to /var/run/cups/cups.sock (Domain)
> > > I [20/Mar/2015:13:02:24 -0400] Remote access is enabled.
> > > D [20/Mar/2015:13:02:24 -0400] Added auto ServerAlias newserver.wendellfreelibrary.org
> > > D [20/Mar/2015:13:02:24 -0400] Added auto ServerAlias newserver
> > > I [20/Mar/2015:13:02:24 -0400] Loaded configuration file "/etc/cups/cupsd.conf"
> > > D [20/Mar/2015:13:02:24 -0400] Repairing access permissions of "/etc/cups/classes.conf"
> > > I [20/Mar/2015:13:02:24 -0400] Using default TempDir of /var/spool/cups/tmp...
> > > I [20/Mar/2015:13:02:24 -0400] Configured for up to 100 clients.
> > > I [20/Mar/2015:13:02:24 -0400] Allowing up to 100 client connections per host.
> > > I [20/Mar/2015:13:02:24 -0400] Using policy "default" as the default!
> > > I [20/Mar/2015:13:02:24 -0400] Full reload is required.
> > > I [20/Mar/2015:13:02:24 -0400] Loaded MIME database from "/usr/share/cups/mime" and "/etc/cups": 35 types, 41 filters...
> > > D [20/Mar/2015:13:02:24 -0400] Loading printer BlackandWhiteLaserjet...
> > > D [20/Mar/2015:13:02:24 -0400] load_ppd: Loading /var/cache/cups/BlackandWhiteLaserjet.ipp...
> > > D [20/Mar/2015:13:02:24 -0400] cupsdRegisterPrinter(p=0x7f10bf57e5b0(BlackandWhiteLaserjet))
> > > D [20/Mar/2015:13:02:24 -0400] Loading printer BrotherColorLaser...
> > > D [20/Mar/2015:13:02:24 -0400] load_ppd: Loading /var/cache/cups/BrotherColorLaser.ipp...
> > > D [20/Mar/2015:13:02:24 -0400] cupsdRegisterPrinter(p=0x7f10bf571850(BrotherColorLaser))
> > > D [20/Mar/2015:13:02:24 -0400] Loading printer Officejet_Color...
> > > D [20/Mar/2015:13:02:24 -0400] cupsdMarkDirty(P-----)
> > > D [20/Mar/2015:13:02:24 -0400] cupsdSetBusyState: Dirty files
> > > D [20/Mar/2015:13:02:24 -0400] load_ppd: Loading /etc/cups/ppd/Officejet_Color.ppd...
> > > D [20/Mar/2015:13:02:24 -0400] cupsdRegisterPrinter(p=0x7f10bf573980(Officejet_Color))
> > > I [20/Mar/2015:13:02:24 -0400] Loading job cache file "/var/cache/cups/job.cache"...
> > > D [20/Mar/2015:13:02:24 -0400] [Job 2323] Loading from cache...
> > > D [20/Mar/2015:13:02:24 -0400] [Job 2324] Loading from cache...
> > > I [20/Mar/2015:13:02:24 -0400] Full reload complete.
> > > I [20/Mar/2015:13:02:24 -0400] Cleaning out old temporary files in "/var/spool/cups/tmp"...
> > > E [20/Mar/2015:13:02:24 -0400] Unable to remove temporary file "/var/spool/cups/tmp/.fontconfig" - Is a directory
> > > I [20/Mar/2015:13:02:24 -0400] Listening to 0.0.0.0:631 on fd 7...
> > > I [20/Mar/2015:13:02:24 -0400] Listening to :::631 on fd 8...
> > > I [20/Mar/2015:13:02:24 -0400] Listening to /var/run/cups/cups.sock on fd 9...
> > > I [20/Mar/2015:13:02:24 -0400] Resuming new connection processing...
> > > D [20/Mar/2015:13:02:24 -0400] cupsdRegisterPrinter(p=0x7f10bf57e5b0(BlackandWhiteLaserjet))
> > > D [20/Mar/2015:13:02:24 -0400] cupsdRegisterPrinter(p=0x7f10bf571850(BrotherColorLaser))
> > > D [20/Mar/2015:13:02:24 -0400] cupsdRegisterPrinter(p=0x7f10bf573980(Officejet_Color))
> > > D [20/Mar/2015:13:02:24 -0400] Discarding unused server-started event...
> > > D [20/Mar/2015:13:02:25 -0400] Report: clients=0
> > > D [20/Mar/2015:13:02:25 -0400] Report: jobs=2
> > > D [20/Mar/2015:13:02:25 -0400] Report: jobs-active=0
> > > D [20/Mar/2015:13:02:25 -0400] Report: printers=3
> > > D [20/Mar/2015:13:02:25 -0400] Report: printers-implicit=0
> > > D [20/Mar/2015:13:02:25 -0400] Report: stringpool-string-count=390
> > > D [20/Mar/2015:13:02:25 -0400] Report: stringpool-alloc-bytes=7072
> > > D [20/Mar/2015:13:02:25 -0400] Report: stringpool-total-bytes=8816
> > > I [20/Mar/2015:13:02:55 -0400] Saving printers.conf...
> > > E [20/Mar/2015:13:02:55 -0400] Unable to finalize "/etc/cups/printers.conf": Permission denied
> > > D [20/Mar/2015:13:02:55 -0400] cupsdSetBusyState: Not busy
> > >
> > > I don't know what the 'Unable to finalize "/etc/cups/printers.conf":
> > > Permission denied' is all about. The permissions are:
> > >
> > > drwxr-xr-x. root lp system_u:object_r:cupsd_etc_t:s0 /etc/cups/
> > > /etc/cups:
> > > -rw-r-----. root lp unconfined_u:object_r:cupsd_rw_etc_t:s0 classes.conf
> > > -rw-------. root lp unconfined_u:object_r:cupsd_rw_etc_t:s0 classes.conf.O
> > > -rw-r--r--. root lp system_u:object_r:etc_t:s0 client.conf
> > > -rw-r-----. root lp unconfined_u:object_r:cupsd_etc_t:s0 cupsd.conf
> > > -rw-r-----. root lp unconfined_u:object_r:cupsd_etc_t:s0 cupsd.conf~
> > > -rw-r-----. root lp system_u:object_r:cupsd_rw_etc_t:s0 cupsd.conf.default
> > > drwxr-xr-x. root root system_u:object_r:cupsd_interface_t:s0 interfaces
> > > -rw-r--r--. root lp system_u:object_r:cupsd_rw_etc_t:s0 lpoptions
> > > -rw-r--r--. root root system_u:object_r:cupsd_etc_t:s0 paps.convs
> > > drwxr-xr-x. root lp system_u:object_r:cupsd_rw_etc_t:s0 ppd
> > > -rw-------. root lp unconfined_u:object_r:cupsd_etc_t:s0 printers.conf
> > > -rw-------. root lp unconfined_u:object_r:cupsd_rw_etc_t:s0 printers.conf.N
> > > -rw-r--r--. root lp system_u:object_r:cupsd_etc_t:s0 snmp.conf
> > > drwx------. root lp system_u:object_r:cupsd_etc_t:s0 ssl
> > > -rw-r--r--. root lp system_u:object_r:cupsd_rw_etc_t:s0 subscriptions.conf
> > >
> > > /etc/cups/interfaces:
> > >
> > > /etc/cups/ppd:
> > > -rw-r--r--. root lp unconfined_u:object_r:cupsd_rw_etc_t:s0 BlackandWhiteLaserjet.ppd
> > > -rw-r--r--. root lp unconfined_u:object_r:cupsd_rw_etc_t:s0 BrotherColorLaser.ppd
> > > -rw-r--r--. root root unconfined_u:object_r:cupsd_rw_etc_t:s0 MFC9970CDW.ppd
> > > -rw-r--r--. root root unconfined_u:object_r:cupsd_rw_etc_t:s0 Officejet_Pro_L7700_fax.ppd
> > >
> > > /etc/cups/ssl:
> > > -rw-------. root lp system_u:object_r:cupsd_rw_etc_t:s0 server.crt
> > > -rw-------. root lp system_u:object_r:cupsd_rw_etc_t:s0 server.key
> > >
> > >
> > > We do have an 'extra' printer queue, for a retired printer (that is somewhat
> > > disfunctional, but kept as an emergency fill in).
> > >
> > > Is there anything else I should be looking at?
> > >
> > > It is anoying to have to re-create the print queues whenever I do an update
> > > (that might restart the cups daemon) or simply reboot the server for whatever
> > > reason, since a server reboot implies a restart of the cups daemon.
> > >
> > > The system is CentOS 6.6 (up to date), cups-1.4.2-67.el6.x86_64,
> > > cups-libs-1.4.2-67.el6.x86_64, and cups-pk-helper-0.0.4-12.el6.x86_64.
> > >
> > >
> > > At Sun, 29 Jun 2014 19:04:56 -0400 Robert Heller <heller at deepsoft.com> wrote:
> > >
> > >>
> > >> Software versions:
> > >> 1) Host Server: CentOS 6.5 (up to date), cups-1.4.2-50.el6_4.5.x86_64
> > >> 2) VM server: Ubuntu 14.04 (up to date), cups 1.7.2-0ubuntu1 amd64
> > >> 3) Diskless workstations: Ubuntu 14.04 (up to date), cups 1.7.2-0ubuntu1 amd64
> > >>
> > >> We have two networked (hard Ethernet, with static IP addresses) Laser
> > >> printers, a HP LaserJet 4200 (old but works great) and a Brother Color
> > >> MFC-9970CDW.
> > >>
> > >> What happened:
> > >>
> > >> I updated the Host Server (standard yum update) and then rebooted it (the
> > >> update brought in a new kernel). And then printer queues became
> > >> 'disfunctional'. Printing a test page resulted in a
> > >> client-error-document-format-not-supported type of error. Deleting and
> > >> re-installing the print queues fixed it. Why did this happen? And why does
> > >> re-installing the print queues fix it? Followup question: is there a way to do
> > >> fix this from the command line? It is a royal pain to have to do this with the
> > >> web GUI, esp. since it precludes doing it remotely.
> > >>
> > >> Also, just as a side adventure, the Ubuntu VM system decided to (on its own!)
> > >> remove the color printer. I have not clue as to why that happened. I did
> > >> *uninstall* the pesky cups-browserd package (which is a total disaster for a
> > >> server or even fixed desktop machines with fixed hardwired printers).
> > >>
> > >>
> > >> (Longing for the good old days of LPD! -- CUPS can be a total pain in the butt
> > >> at times.)
> > >>
> > >
> > > --
> > > Robert Heller -- 978-544-6933
> > > Deepwoods Software -- Custom Software Services
> > > http://www.deepsoft.com/ -- Linux Administration Services
> > > heller at deepsoft.com -- Webhosting Services
> > >
> > > _______________________________________________
> > > cups mailing list
> > > cups at cups.org
> > > https://www.cups.org/mailman/listinfo/cups
> >
> > _______________________________________________
> > cups mailing list
> > cups at cups.org
> > https://www.cups.org/mailman/listinfo/cups
> >
> >
> >
>
--
Robert Heller -- 978-544-6933
Deepwoods Software -- Custom Software Services
http://www.deepsoft.com/ -- Linux Administration Services
heller at deepsoft.com -- Webhosting Services
More information about the cups
mailing list