CentOS 6.2 Configuring CUPS By Example (CentOS 6 By Example)
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You'll probably need to experiment for a while to get it to work perfectly. One of the more interesting CUPS features is automatic network printer discovery. This is called browsing. The cupsd. However, without additional help, your CUPS server will likely not make itself known to the other print servers on the network. For example, to send notification packets to as many hosts on the network as possible essentially, as many as your routers allow , use this parameter:.
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You can think of a numeric broadcast address as a sort of inverse subnet combined with an IP address. For example, to send packets to the subnet defined by This said, the best choice is likely the "local" interface selection that sends broadcast packets out to all network interfaces except PPP links:. If you have a server with several Ethernet interfaces, but do not want to broadcast on all of these interfaces, use IF. For example, here's how to broadcast to eth1 :. Browsing and broadcasting goes a long way toward allowing communication between various CUPS servers on a network, but if you want older clients running Berkeley LPD printing systems to be able to print to your CUPS server, you need to configure your server to allow jobs from these clients.
This is an inetd service see Section 6.
There is no built-in access control in cups-lpd , but like any other network service, you want to make sure that your firewall rules have adequate coverage; see Section 5. When you have a problem with CUPS, it's particularly important to take things one step at a time. You may find this sequence helpful:. Send a test file to the printer with the Web interface and lp , and verify that the jobs complete with lpstat :. Use your printer's PPD file to activate your filter. See Sections Print more test files, again making sure that the jobs finish. Add the printer's actual device, and then try another test job.
If necessary, try printing to a file, then sending the file directly to the printer. If a test print job fails and stalls, the printer state changes to "not ready," and you need to start the printer again to retry the job or run any new jobs. Do this with enable printer or the Web interface. Before you start changing files around, though, you should look at your log files, which are described in the next section. The complex nature of the print spooler and filters makes it crucial that you pay careful attention to your log messages.
The letter at the start of the line indicates the message severity or priority. The three letters in the preceding example are as follows:. I An informational log message. These notices usually indicate some significant event, such as a filter invocation or job submission. D A verbose debugging message.
You should not care about these unless you run into a problem. E An error message indicating that something doesn't work. The CUPS scheduler usually keeps running if there is an error. However, you may end up missing a feature or having a stalled printer job. You can change the log level with the LogLevel parameter in the cupsd. The default level is info in most installations. If you want the debugging messages, you must use debug. If you change your LogLevel parameter, remember to reload your configuration file after making any changes by sending a HUP signal to cupsd.
To do this, first disable any filters that you might have in your printer's PPD file so that you can eliminate the backend filter from the list of things that can go wrong. You will probably only have such filters if you are using a non-PostScript printer. After making this change and making cupsd re-read its configuration with a HUP signal , submit a test job to see if data can make it past the mime. Although you are not likely to run into any trouble with the CUPS-supplied filter programs in mime.
Having worked out any kinks not involving the cupsFilter filter, re-enable this parameter and look for more trouble:. For the Foomatic filter, use foomatic-rip -v manually from the command line to check for valid output see Section If your filter relies on Ghostscript, ensure that you have the required driver by running gs -help. When fixing the permissions, look for these problems:.
Can the lp user access each of them? Verify that lp belongs to the sys group.
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Remember that you can change the pseudo-user and group with the User and Group parameters of cupsd. After running through the filter gauntlet, you are ready to send output to devices. Fortunately, there is relatively little that can go wrong at this final stage:. The lp user must have write access to any printer device directly connected to the system. For network printers, make sure that your host can reach the printer.
If your device is the socket type on TCP port , test the connection with this command:. Unless you know the printer's native language, this connection does little good other than confirming that it can be made. Toggle navigation. See also. Home Linux systems How linux works. Run through the following steps on a new installation: Scan your cupsd. The bare minimum command for adding a printer without a print filter is as follows: lpadmin -p name -v device.
Adding a Test Printer As is the case with most Unix utilities, commands like lpadmin do nothing more than modify text files except that with CUPS, lpadmin opens a network connection to the CUPS server, sends some data, and then the server changes the files. Adding a Real Printer Now that you have some familiarity with the process, you are ready to add a real printer with a particular model using this command: lpadmin -p name -v device -m model.
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You can get a partial list of URI options with the lpinfo command: lpinfo -v. CUPS filters convert file formats in two ways: To a common format This type of filter converts various file formats into a common format.
CUPS Filters and mime. Unable to convert file 0 to printable format for job n! However, you should develop at least a passing familiarity with the following commands remember that each command has a manual page : lpadmin Adds, removes, and modifies printers. To display a quick list of options for a particular printer, run this command: lpoptions -p printer -l. Error Messages The complex nature of the print spooler and filters makes it crucial that you pay careful attention to your log messages.
Spool Directory Permission Errors Look for this message in your error log: E [ timestamp ] [Job n ] unable to open print file - : Permission denied.
Device Problems After running through the filter gauntlet, you are ready to send output to devices. Fortunately, there is relatively little that can go wrong at this final stage: The lp user must have write access to any printer device directly connected to the system. Remember the name: eTutorials. Chapter 1: The Basics.
Chapter 2: Devices, Disks, Filesystems, and the Kernel. Chapter 3: How Linux Boots. Chapter 5: Configuring Your Network. Chapter 6: Network Services.
21.3.5. Adding an IPP Printer
Chapter 7: Introduction to Shell Scripts. Chapter 8: Development Tools. Chapter Maintaining the Kernel.