第12章 Using cups-browsed to locally integrate printers from a remote print server

The cups-browsed service uses DNS service discovery (DNS-SD) and CUPS browsing to make all or a filtered subset of shared remote printers automatically available in a local CUPS service.

For example, administrators can use this feature on workstations to make only printers from a trusted print server available in a print dialog of applications. It is also possible to configure cups-browsed to filter the browsed printers by certain criteria to reduce the number of listed printers if a print server shares a large number of printers.

注記

If the print dialog in an application uses other mechanisms than, for example DNS-SD, to list remote printers, cups-browsed has no influence. The cups-browsed service also does not prevent users from manually accessing non-listed printers.

Prerequisites

The CUPS service is configured on the local host.
A remote CUPS print server exists, and the following conditions apply to this server:
- The server listens on an interface that is accessible from the client.
- The Allow from parameter in the server’s <Location /> directive in the /etc/cups/cups.conf file allows access from the client’s IP address.
- The server shares printers.
- Firewall rules allow access from the client to the CUPS port on the server.

Procedure

Edit the /etc/cups/cups-browsed.conf file, and make the following changes:
1. Add BrowsePoll parameters for each remote CUPS server you want to poll:
  BrowsePoll remote_cups_server.example.com BrowsePoll 192.0.2.100:1631
  Append :_<port>_ to the hostname or IP address if the remote CUPS server listens on a port different from 631.
2. Optional: Configure a filter to limit which printers are shown in the local CUPS service. For example, to filter for queues whose name contain sales_, add:
  BrowseFilter name sales_
  You can filter by different field names, negate the filter, and match the exact values. For further details, see the parameter description and examples in the cups-browsed.conf(5) man page on your system.
3. Optional: Change the polling interval and timeout to limit the number of browsing cycles:
  BrowseInterval 1200 BrowseTimeout 6000
  Increase both BrowseInterval and BrowseTimeout in the same ratio to avoid situations in which printers disappear from the browsing list. This mean, multiply the value of BrowseInterval by 5 or a higher integer, and use this result value for BrowseTimeout.
  By default, cups-browsed polls remote servers every 60 seconds and the timeout is 300 seconds. However, on print servers with many queues, these default values can cost many resources.
Enable and start the cups-browsed service:
```
# systemctl enable --now cups-browsed
```

Verification

List the available printers:
```
# lpstat -v
device for Demo-printer: implicitclass://Demo-printer/
...
```
If the output for a printer contains implicitclass, the cups-browsed service manages the printer in CUPS.

第12章 Using cups-browsed to locally integrate printers from a remote print server

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