[cups] cupsd changing remote printer definitions in printers.conf

Michael Sweet msweet at apple.com
Wed Dec 6 12:08:00 PST 2017


Kevin,

Maybe cups-browsed is doing something, or some other third-party software running on your servers?  CUPS itself doesn't do anything like this...


> On Dec 6, 2017, at 9:57 AM, Kevin Kretz <kevin at rentec.com> wrote:
> 
> Hi, Hope this is the right list for my question. 
> 
> I have a print server (we'll call it printserver1) which has a bunch of printers defined. These printers live in a segregated network, inaccessible to most machines other than this print server. 
> 
> There is also a new network, used for testing and also mostly segregated from the main network. It also hosts a print server running cups (we'll call it printserver2). The client hosts running in this network can't access anything on the main network. Printserver2 is allowed to communicate with printserver1. 
> 
> When I set up printserver2 and define its printers like 
> 
> DeviceURI ipp://printserver1.domain.com/printers/printer_name 
> 
> everything works great. That is, until every hour on the 14th minute, when some process rewrites some of my printer definitions. 
> 
> Most of the printers on printserver1 are defined like 
> 
> DeviceURI socket://printername.domain.com:9100/ 
> 
> All of the printers defined this way on printserver1 continue to work properly on printserver2. 
> 
> However, four printers on printserver1 are defined with IPP, like 
> 
> DeviceURI ipp://printername.domain.com 
> 
> ... and after whatever refresh procedure cups does hourly runs, their definitions on printserver2 are changed to match those on printserver1. 
> 
> I understand the benefit of that when both printservers are on the same network. But in this case, they aren't - the initial config works, and the updated config doesn't. 
> 
> I can't find reference to what this update process is or how to modify its behavior. Can someone point me in the right direction please? 
> 
> 
> thanks 
> 
> Kevin 
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_________________________________________________________
Michael Sweet, Senior Printing System Engineer



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