CUPS client 1.3.7 and implicit classes

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Well, that is interesting.
If a running server dropped off one client but not another I would explicitly set the BrowseTimeout on the failing client to a large value and see what happens.

Maybe even shorten BrowseInterval on server..

With wireshark you can monitor IPP browse broadcast packets to make sure server is sending properly.

I hope its not worse than this.

have a good day : )


> Hi all,
>
> I am trying to upgrade our CUPS linux printing service by creating two print servers.  These servers will be identically configured (i.e. identical printer queue names etc) to try and give us redundancy ('failover').  Each server is running CUPS 1.2.12.  I have had success with a client running CUPS 1.1.22 but found problems with a client running CUPS 1.3.7.
>
> Details:
>
> By creating identical print servers I make use of CUPS' implicit classes.  If I stop the cups service on my "second" print server - FQDN2 in details below - (i.e. to simulate failure or re-configuration), I see the following:
>
> CUPS 1.1.22 client: All printers are still available.  (Using remaining print server)
> CUPS 1.3.7 client: All printers disappear.  (Even though remaining server is active)
>
> The cups log of the 1.3.7 client explicitly states that it is polling both of the configured print servers.
>
> Has anyone discovered the same problem?  I have searched the bug reports and not found anything relevant for CUPS 1.3.7.
>
> I doubt that I am the first person to try to set up two CUPS servers with these versions, so will be happy to be told of a mistake I have made!  More details and cups configuration files are below.
>
> Any help appreciated!
> Jon
>
>
> ++++
>
>
> ++ CUPS 1.1.22 client:
>
> # yum list installed | grep cups
> cups.i386                                1:1.1.22-0.rc1.9.27.el installed
> cups-devel.i386                          1:1.1.22-0.rc1.9.27.el installed
> cups-libs.i386                           1:1.1.22-0.rc1.9.27.el installed
> hal-cups-utils.i386                      0.5.2-8                installed
> libgnomecups.i386                        0.1.12-5               installed
>
>
> (Config file with server names masked.)
> # cat /etc/cups/cupsd.conf
>
> # basic cupsd.conf for clients
>
> LogLevel info
> # LogLevel debug
>
> HostNameLookups On
>
> Browsing On
> BrowseShortNames Yes
> BrowseOrder allow,deny
> BrowseDeny All
> BrowsePoll FQDN1:631
> BrowsePoll FQDN2:631
>
> ImplicitClasses Yes
> ImplicitAnyClasses Yes
> HideImplicitMembers Yes
>
> DefaultAuthType Basic
>
> <Location />
>  Order Allow, Deny
>  Allow localhost
> </Location>
>
> <Location /admin>
>  AuthType Basic
>  Require user @SYSTEM
>  Order Allow, Deny
>  Allow localhost
> </Location>
>
> Listen localhost:631
> Listen /var/run/cups/cups.sock
>
>
> ++ CUPS 1.3.7 client
>
> # yum list installed | grep cups
> cups.i386                                1:1.3.7-8.el5_3.6      installed
> cups-libs.i386                           1:1.3.7-8.el5_3.6      installed
> hal-cups-utils.i386                      0.6.2-5                installed
> libgnomecups.i386                        0.2.2-8                installed
>
>
> (Config file with server names masked.)
> # cat /etc/cups/cupsd.conf
>
> # basic cupsd.conf for clients
>
> LogLevel info
> # LogLevel debug
>
> HostNameLookups On
>
> Browsing On
> BrowseShortNames Yes
> BrowseOrder allow,deny
> BrowseDeny All
> BrowsePoll FQDN1:631
> BrowsePoll FQDN2:631
>
> ImplicitClasses Yes
> ImplicitAnyClasses Yes
> HideImplicitMembers Yes
>
> DefaultAuthType Basic
>
> <Location />
>  Order Allow, Deny
>  Allow localhost
> </Location>
>
> <Location /admin>
>  AuthType Basic
>  Require user @SYSTEM
>  Order Allow, Deny
>  Allow localhost
> </Location>
>
> Listen localhost:631
> Listen /var/run/cups/cups.sock