[SOLVED] Re: System_d biting CUPS

[Siard <shiems146@kpnplanet.nl>]

On Sat, 7 Jun 2014 20:26:15 +0100, Brian wrote:
> On Sat 07 Jun 2014 at 19:24:54 +0200, Siard wrote:
> >
> > /etc/cups/cupsd.conf:  http://pastebin.com/L8VvsSQ8
> 
> This looks like the default file (apart from 'SystemGroup lpadmin',
> which should be in another file and which doesn't matter). The list is
> very tolerant of a file less than 5 kB in size. Also, in time it
> doesn't disappear and is easier to work with.

/usr/share/cups/cupsd.conf.default exists as well. A 'diff' shows that the
absence of 'SystemGroup lpadmin' there is the only difference.

> > /etc/cups/cupsd-systemd-listen.conf:
> > <comments left out>
> > ListenStream=127.0.0.1:631
> > ListenStream=[::1]:631
> 
> The commented line (which you omitted) before these two has some
> importance. It's never a good thing to edit when seeking help.

Notice taken.

> There are a number of ways to get 'lpstat: Bad file descriptor'. Most
> do not apply to you. My only guess is that you have disabled ipv6.
> 
>    cat /proc/sys/net/ipv6/conf/all/disable_ipv6

/proc/sys does not exist here (jessie) and 'locate disable_ipv6' shows
nothing.  But /etc/sysctl.d/disableipv6.conf does exist and contains
this line:

   net.ipv6.conf.all.disable_ipv6=1

I changed 1 to 0 and wow!!! CUPS with systemd is working again!
Wonderful.
I found that after issuing a print command (e.g. from LibreOffice) CUPS
remains active for 1 min. 2s. That's how systemd apparently works.

Until 1min 2s after printing:

$ systemctl status cups
cups.service - CUPS Printing Service
   Loaded: loaded (/lib/systemd/system/cups.service; enabled)
   Active: active (running) since sat 2014-06-07 22:20:22 CEST; 1min 2s ago
     Docs: man:cupsd(8)
           man:cupsd.conf(5)
 Main PID: 1539 (cupsd)
   CGroup: name=systemd:/system/cups.service
           └─1539 /usr/sbin/cupsd -f

One second later:

$ systemctl status cups
cups.service - CUPS Printing Service
   Loaded: loaded (/lib/systemd/system/cups.service; enabled)
   Active: inactive (dead) since sat 2014-06-07 22:21:25 CEST; 871ms ago
     Docs: man:cupsd(8)
           man:cupsd.conf(5)
  Process: 1539 ExecStart=/usr/sbin/cupsd -f (code=exited, status=0/SUCCESS)

I must say, I am rather impressed with your expertise. Thank you very
much!