Configuration for MaxSubscriptions (needed for > 100 clients)

[olifre]

Given CentOS 7.7 with Puppet 5.5.17 and CUPS 1.6.3.

When I have about 150 clients.

In order to Support 150 clients.

Then I get the error message:

E [14/Jan/2020:13:25:39 +0100] Returning IPP client-error-too-many-subscriptions for Create-Printer-Subscription (/)

every minute in cups error log.

Solution
Define MaxSubscriptions (and of course, max_clients which this module already supports).
In total, there are four variables of interest here:

MaxSubscriptions
MaxSubscriptionsPerJob
MaxSubscriptionsPerPrinter
MaxSubscriptionsPerUser

see:
https://github.com/apple/cups/blob/1f2a315c2b3e2f78c37c1505fc66909ad01df85e/scheduler/conf.c#L119-L122

It would be nice to see this supported (since this is the natural extension of the max_clients property). The default within cups seems to be 100 maximum subscribers.