[[http://acelab.cbrain.mcgill.ca/wiki/doku.php?id=start|Return to MCIN Home Page]] ====== Using CUPS ====== ===== Checking Printer Status ===== * [[http://132.216.122.31:631/printers/Hewlett-Packard-hp-color-LaserJet-3500?which_jobs=all|Show All Jobs on ace-printer-1 in NW147]] * [[https://cups.ncs.mcgill.ca:631/printers|McGill UPRINT Printers]] ===== A bit about CUPS and ipp (Internet printing protocol) ===== **CUPS**, an acronym for **Common Unix Printing System**, is a printing system for Unix-like operating systems such as Linux and Darwin (OS X). A computer running CUPS is a host that can accept print jobs from client computers, process them, and send them to the appropriate printers queue. Printing via **CUPS** allows the usage of the **Internet printing protocol**, or **ipp** and has the following advantages: * Clients systems do not need to have printer drivers installed on them. * **IPP** uses a single port, port **631** for **TCP** and **UDP** traffic if **IPP printer discovery** is desired. ===== Printing ===== Most of your interaction with CUPS will be when you **print** something. **CUPS** and many users of Unix-like systems refer to the act of pressing the **Print** button as "submitting a print job". Most of the time **print jobs** are sent to a printers queue and the printer prints them one after the other. ===== Using the Printer Card ===== Printing to a McGill uPrint printer with the ACELab printer card can only be done from the command line. ==== List Printers ==== First check to see if the printers are available on your machine: <code> me@ace-ws-00:~$ lpstat -p </code> Output example: <code> printer HP-color-laserjet is idle. enabled since Thu 26 Jan 2017 02:32:24 PM EST printer McGill_Color is idle. enabled since Thu 16 Feb 2017 02:43:59 PM EST printer mcgill_mono is idle. enabled since Thu 16 Feb 2017 02:44:14 PM EST printer mcgill_mono_beta is idle. enabled since Thu 16 Feb 2017 02:44:00 PM EST </code> You can see here a local printer and the McGill uPrint printers. ==== Printing ==== To print a file named myfile.txt to mcgill_mono using the amni16 "Evans Lab Students" account: <code> me@ace-ws-00:~$ lp -U amni16 -d mcgill_mono myfile.txt request id is mcgill_mono-117 (1 file(s)) </code> Then, find the amni16 uPrint card and release the job at the printer. ===== Configuring a system to use a CUPS network printer ===== ==== Requirements ==== * You need to be using your MCIN user name and password to sign on to your system. * Alternativly, your user must be a member of the local or LDAP enabled lpadmin group. ==== Adding networked printers to an Ubuntu client ==== === Requirements: === * The ''%%system-config-printer%%'' application. * User must be a member of the local systems ''%%lpadmin%%'' group. === Real world setup for the HP color LaserJet 3500 in NW 147 === Start the printers interface from the command line with sudo as follows: <code> sudo system-config-printer </code> - Open the **Printing** application. - Choose **Add**. - Select the option **Network Printer** - Choose **Find Network Printer** - On the right side of the Window enter the following at the host: <code> cups.ncs.mcgill.ca </code> - Choose the **Find** button. - Under **Enter device URI** enter something like this: ''%%ipp://132.216.122.31:631/printers/HP-color-LaserJet-3500%%'' or ''%%ipp://ace-printer-1:631/printers/HP-color-LaserJet-3500%%'' Then choose **Forward** === Printer Description === **Printer Name** <code> HP-color-laserjet </code> **Description** <code> HP color LaserJet 3500 USB </code> **Location** <code> NW 147 </code> {{:1.png?400|}} {{:2.png?420|}} {{:3.png?400|}} {{:4.png?420|}} ===== Held Jobs ===== Occasionally a job will be **held** and when a **held** job reaches the top of the print queue it is held and all of the jobs after it are also held until the held job is **cancelled**, **moved** or **deleted**. ===== Managing print jobs ====== 1. Go to the CUPS web interface ( Make sure to include the **:631** after the name of the workstation hosting the printer or you will not get the CUPS web interface ) https://ace-printer-1.cbrain.mcgill.ca:631/jobs/ 2. Choose the **Jobs** tab and you will see all of the print requests (Jobs) 3. In this example the first job is **held** which stops the printer queue. This prevents all of the print jobs after it from printing. Choose the most approriate option from the following: * Choose **Cancel Job** to cancel the print job and remove it from the job (or print) queue. * Choose **Release Job** in order to print the **held** job or * Choose **Move** if you want to move this to a different printer queue. In the example below the document has been held in the queue since June 9th so I would probably choose the **Cancel Job** button. {{:managing_print_jobs-highlighted.png?|}} Do not print a test page at this time. Double-click on the printer, select **Policies** and change **Operation Policy** from **Default Behavior** to **Authenticated** and click **Apply**. ==== References ==== * [[https://en.wikipedia.org/wiki/Internet_Printing_Protocol|Wikipedia - Internet//Printing//Protocol - 2016-05-09]].
