Difference between revisions of "Setting up Samba as a Print Server"

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= General =
+
= Introduction =
  
== Introduction ==
+
If you set up Samba as a print server, clients in your network are able to send print jobs to the Samba host using the server message block (SMB) protocol. The examples shown in this documentation use a raw printer in the back end. This configuration requires that the print job is formatted by a driver on the client and thus can be processed by the printer without further processing or filtering.
  
This HowTo will provide you an easy guide to setup Samba to act as a Windows print server including Point'n'Click printer driver installation for users.
 
  
'''This HowTo is valid for Samba 3 and 4 print server installations.'''
 
  
  
 +
= Supported Print Server Back Ends =
  
== Some definitions ==
+
Samba supports the multiple print server back ends, such as [https://www.cups.org/ CUPS] and [http://www.lprng.com/ LPRng]. For a complete list, see the <code>printing</code> parameter in the <code>smb.conf(5)</code> man page.
  
; Printer share : Each printer is shared by a name. During the printing process, the client sends the printjob to it.
+
{{Imbox
 +
| type = note
 +
| text = You must set up the printer server back end locally on the Samba host. Samba cannot forward print jobs to a remote host. However, you can configure the local printer server back end to forward the job to a remote print server.
 +
}}
  
; Print server backend : Samba can use e. g. CUPS, LPD/Lprng and other as backend. The print server forwards the job to local or network printers.
+
For details how to set up the back end, see the print server's documentation.
  
; Windows printer driver : A piece of software, that converts the printed data to a printer specific form. The driver for each shared printer can be preconfigured with default values.
 
  
; Point'n'Print : Windows 2000 and later support the abillity to automatically download and install drivers from the server including preconfiguring, when connecting a printer. The installation can be done by ordinary users, without special permissions.
 
  
; Printer forms : Windows is already shipped with an amount of forms, that define the typical paper sizes. If a formular isn't known to the print server, the client could not use this, altought the printer is able to do it.
+
== Samba <code>CUPS</code> or <code>IPRINT</code> Back End Support ==
  
 +
When using the <code>CUPS</code> or <code>IPRINT</code> print server back end, Samba must have been built with CUPS support enabled. To verify, enter:
  
 +
# smbd -b | grep "HAVE_CUPS"
 +
    HAVE_CUPS
  
== Driver models ==
+
If no output is displayed:
 
+
* Samba was built using the <code>--disable-cups</code> parameter.
Supported by Samba: Printer driver version 3 (Windows 2000 to Windows 8)
+
* The Samba <code>configure</code> script was unable to locate the required libraries for CUPS support. For details, see [[Package Dependencies Required to Build Samba]].
 
 
Currently not supported by Samba: [http://msdn.microsoft.com/en-us/library/windows/hardware/hh706306%28v=vs.85%29.aspx Printer driver version 4] (Windows 8)
 
 
 
  
  
  
 
= Print server backend =
 
 
The following sub-chapters will give you a short overview on possible backends, including adding a new network printer, we'll use in our later examples for sharing it by Samba.
 
 
The examples setup a RAW printer (content is send directly to the device). We don't use filters or drivers  on the backend, because a RAW printer allows us to render the output on the workstation and use the printer specific driver.
 
 
We assume here, that you have the print server backend already basically configured and it's running, so printers can be added next.
 
  
  
 +
= Adding a printer to the Print Server Back End =
  
 
== CUPS ==
 
== CUPS ==
  
[http://www.cups.org CUPS] is currently the most widely used spool system in *nix environments and shipped with most distributions. Samba has built-in support and defaults to CUPS if the development package (aka header files and libraries) could be found at compile time.
+
To add a raw printer to an CUPS print server:
 
 
Basically all sorts of files can be printed with CUPS, but using a Postscript or a RAW printer driver will give you the most benefit in combination with the Windows printer driver, because then all settings can be controlled on the Windows client.
 
 
 
 
 
 
 
=== Adding a new printer ===
 
 
 
* Open the CUPS admin webfrontend (https://servername:631/admin).
 
 
 
* On the „Administration“ tab click the „Add Printer“ button.
 
 
 
* Choose the way, how your printer is connected and enter the appropriate URL. Examples:
 
# LPD protocol
 
lpd://hostname/queue
 
 
# Internet Printing Protocol
 
ipp://hostname/ipp/port
 
 
# Forwarding the jobs to a Windows print server.
 
# Hint: Vista and higher, don't allow anonymous connects by default, so you must provide a username and password.
 
smb://username:password@domain/servername/printername
 
  
* Enter a name for the printer
+
* Open the CUPS admin web interface in your browser. For example, <nowiki>https://servername:631/admin</nowiki>
  
* When you reached the step, where to choose the vendor and model, choose „Raw“ for both, because the rendering is already done later by the Windows driver.
+
* Select the <code>Administration</code> tab and click <code>Add Printer</code>.
  
* Save the new added printer.
+
* Select the connection type and enter the corresponding URL to the printer's queue or to the remote print server queue. For example:
 +
:* LPD-based printers: <code>lpd://''printer_name''/''queue''</code>
 +
:* IPP (Internet Printing Protocol)-based printers: <code>ipp://''printer_name''/ipp/port</code>
 +
:* SMB (Server Message Block)-based printers: <code>smb://''username'':''password''@''domain''/''windows_print_server_host_name''/''printer_name''</code>
 +
:: Note that forwarding a job to a print server running Windows Vista or newer, or Windows Server 2008 or newer requires authentication.
  
 +
* Enter a name for the printer. This name is used in the <code>smb.conf</code> when sharing the printer using Samba.
  
 +
* Select the <code>Raw</code> printer vendor and model.
  
== LPD ==
+
* Save the settings.
  
This was the first widely used printing system and still runs on many servers. It is very simple to install and configure. There are different implementations of LPD servers, like the often used [http://www.lprng.org/ LPRng].
 
  
  
 +
== LPRng ==
  
=== Adding a new printer ===
+
To add a raw printer to a LPRng print server:
  
* To add a new network printer, you simply need to add the following line to your 'printcap' (typically '/etc/printcap'). For the different options used in the example, see 'man printcap'.
+
* Add the following line to the <code>/etc/printcap</code> file:
  
  PRINTERNAME:sd=/path/to/spool/directory:sh:mx=0:mc=0:rm=IP_or_DNS_Name
+
  ''printer_name'':sd=/var/spool/lpd/''printer_name''/:sh:mx=0:mc=0:rm=''Printer_DNS_name_or_IP_address''
 +
: The printer name is used in the smb.conf when sharing the printer using Samba.
 +
: For further details about the options used, see the <code>printcap(5)</code> man page.
  
* After adding the new printer entry, run the following command to create the LPD spool directory and restart/reload the service, to take the changes affect.
+
* To create the spool directory, enter:
  
 
  # checkpc -f
 
  # checkpc -f
# service lpd restart
 
  
* The following command allows you query the state of the printer:
+
* Restart the LPRng service.
  
# lpq -P PRINTERNAME
 
Printer: PRINTERNAME@SAMPRINTSERVER (dest PRINTERNAME@IP_or_DNS_Name)
 
  Queue: no printable jobs in queue
 
Ready
 
 
no entries
 
  
  
  
  
 +
= Enabling the <code>spoolssd</code> Service =
  
= Configuring Samba as print server =
+
The Samba <code>spoolssd</code> is a service that is integrated into the smbd service. If you configured Samba as a print server, you can additionally enable <code>spoolssd</code> to increase performance on print servers with a high number of jobs or printers.
 +
: Without <code>spoolssd</code>, Samba forks the <code>smbd</code> process or each print job and initializes the <code>printcap</code> cache. In case of a large number of printers, the <code>smbd</code> service can become unresponsive for multiple seconds when initializing the cache. The <code>spoolssd</code> service enables you to start pre-forked <code>smbd</code> processes that are processing print jobs without any delay. The main <code>spoolssd</code> <code>smbd</code> process uses a low amount of memory, and forks and terminates child processes
  
== General ==
+
To enable the <code>spoolssd</code> service:
  
=== Granting print operator privileges ===
+
* Edit the <code>[global]</code> section in your <code>smb.conf</code> file:
  
Users or groups, who should be able to administrate printers on your server, have to be granted the „SePrintOperatorPrivilege“ privilege. This is required on member servers, as they have their own, local SAM database. It is recommended, to grant it to a domain group, because changes can be done quick and easily with the typical user management tools like ADUC.
+
:* Add the following parameters:
  
The following example grants the privilege to the domain group „Domain Admins“:
+
rpc_server:spoolss = external
 +
rpc_daemon:spoolssd = fork
  
# net rpc rights grant 'SAMDOM\Domain Admins' SePrintOperatorPrivilege -Uadministrator
+
:* Optionally, you can set the following parameters:
 +
::{| class="wikitable"
 +
!Parameter
 +
!Default
 +
!Description
 +
|-
 +
|spoolssd:prefork_min_children
 +
|5
 +
|Minimum number of child processes
 +
|-
 +
|spoolssd:prefork_max_children
 +
|25
 +
|Maximum number of child processes
 +
|-
 +
|spoolssd:prefork_spawn_rate
 +
|5
 +
|Samba forks this number of new child processes, up to the value set in <code>spoolssd:prefork_max_children</code>, if a new connection is established
 +
|-
 +
|spoolssd:prefork_max_allowed_clients
 +
|100
 +
|Number of clients, a child process serves
 +
|-
 +
|spoolssd:prefork_child_min_life
 +
|60
 +
|Minimum lifetime of a child process in seconds. 60 seconds is the minimum.
 +
|}
  
Existing privileges you can reviewed by
+
* Restart Samba.
  
  # net rpc rights list accounts -Uadministrator
+
After the restart, Samba automatically starts <code>smbd</code> sub-processes:
 +
  # ps axf
 +
...
 +
30903 smbd
 +
30912  \_ smbd
 +
30913      \_ smbd
 +
30914      \_ smbd
 +
30915      \_ smbd
 +
...
  
 +
= Enabling the Print Server Support in Samba =
  
 +
To enable the print server support:
  
=== Setup the [printers] share ===
+
* Set the printing back end in the <code>printing</code> parameter of the <code>[global]</code> section in your <code>smb.conf</code> file. For example:
 +
printing = CUPS
  
This share defines general information about your printing backend. See the „[printers]“ section in the man page for additional information.
+
* Add the following section to your <code>smb.conf</code>:
  
* Add the new section to your smb.conf
 
 
  [printers]
 
  [printers]
      path = /var/spool/samba
+
        path = /var/spool/samba/
      printable = yes
+
        printable = yes
      printing = CUPS|LPRNG|...
 
  
* If you choose CUPS as backend, make sure, that your smbd is compiled with CUPS support:
+
* Create the spool directory set in the <code>path</code> parameter:
# smbd -b | grep CUPS
 
    HAVE_CUPS_CUPS_H
 
    HAVE_CUPS_LANGUAGE_H
 
    HAVE_CUPS
 
    HAVE_LIBCUPS
 
If you don't get any output, make sure, that the CUPS header files and libraries are installed and recompile Samba with --with-cups.
 
 
 
* The next step is to create the samba spool directory, defined in the „[printer]“ share. Set the appropriate permissions, depending to your needs.
 
  
 
  # mkdir -p /var/spool/samba/
 
  # mkdir -p /var/spool/samba/
 
  # chmod 1777 /var/spool/samba/
 
  # chmod 1777 /var/spool/samba/
  
 +
* Reload Samba:
  
 +
# smbcontrol all reload-config
  
=== Setup the [print$] share ===
 
  
To enable Point'n'Print support, a share named „print$“ must exist. This share name is hardcoded in Windows clients and can't be choosen.
 
  
* Add the share to your smb.conf
 
  
[print$]
 
      path = /srv/samba/Printer_drivers
 
      comment = Printer Drivers
 
      writeable = yes
 
  
* Create the folder, that will contain the drivers later:
+
= Sharing a Printer =
  
# mkdir -p /srv/samba/Printer_drivers/
+
== Automatic Sharing of All Printers Configured in the Print Server Back End ==
  
* Next we create the required directory structure for the print$ share (newer versions of Samba will create it on the fly):
+
Using the default setting, all printers configured in the print server back end are automatically shared.
  
BASEDIR=/srv/samba/Printer_drivers
 
for i in COLOR IA64 W32ALPHA W32MIPS W32PPC W32X86/{2,3} WIN40 x64; do
 
      mkdir -p $BASEDIR/$i;
 
done
 
  
* At last, set the permissions. It is recommended that normal users have just read-only access to the share, while the group you have [[Samba_as_a_print_server#Granting_print_operator_privileges|granted print operator privileges]] to, has write permissions to upload printer drivers. The following examples are granting write permissions to the „Domain Admins“ group.
 
  
: Example for Samba 3.x:
+
=== Disabling the Automatic Printer Sharing ===
# chgrp -R „SAMDOM\Domain Admins“ /srv/samba/Printer_drivers/
 
# chmod -R 2755 /srv/samba/Printer_drivers/
 
  
:If you're running Samba 4.x, you can set the ACLs on the print$ share, throught Windows. Your benefit would be, that you can use the full Windows ACLs. Have a look at the [[Setup_and_configure_file_shares#Change_permissions_on_folder_of_a_share|Setup and configure file shares]] HowTo. It describes detailed the process, how to set permissions. The suggested filesystem permissions for the print$ share are:
+
To disable the automatic printer sharing:
:* Creator Owner: Full control (Subfolders and files only)
 
:* Authenticated Users: Read & execute, List folder contents, Read (This folder, subfolders and files)
 
:* System: Full control (This folder, subfolders and files)
 
:* Domain Admins: Full control (This folder, subfolders and files)
 
  
+
* Add the following parameter to the <code>[global]</code> section of your <code>smb.conf</code> file:
  
== Sharing a printer with Samba ==
+
load printers = no
  
* For each printer you want to share via Samba, you have to create a separate share (unless you have "load printers = yes" defined in your smb.conf). The following is an example:
+
* Reload Samba:
 
 
[MyDemoPrinter]
 
      path = /var/spool/samba/
 
      browseable = yes
 
      printable = yes
 
      printer name = Printername_in_backend
 
 
 
* Set the „printer name“ parameter to the name of your corresponding CUPS/LPD/... queue.
 
 
 
* To bring the changes live, reload the Samba configuration:
 
  
 
  # smbcontrol all reload-config
 
  # smbcontrol all reload-config
Line 203: Line 179:
  
  
== Uploading printer drivers for Point'n'Print driver installation==
+
== Manual Sharing of Printers ==
  
If you have already uploaded the driver for your printer in the past, you can skip this section.
+
To manually share a printer:
  
<u>Important notes:</u>
+
* Verify that the automatic printer sharing is disabled. See [[#Disabling_the_Automatic_Printer_Sharing|Disabling the Automatic Printer Sharing]].
  
* If you want to provide Point'n'Print support for drivers, used on different architectures (typically 32-bit and 64-Bit Windows), you have to upload a driver with the same name for all that architectures! This is the only way to define the default printer settings just once on a platform of your choice. And when the driver is send to a host with a different architecture, these default values are used as well. But this requires, that the driver name is exactly the same for each platform. E. g. „HP Universal Printing PS“ for x86 and „HP Universal Printing PS (v5.5.0)“ for x64 would't match, as they are different! Choose exactly the same driver for all platforms, you want to support.
+
* Add the share for the printer to your <code>smb.conf</code> file:
  
* Drivers for x64, can only be uploaded from a x64 Windows! Drivers for the x86 architecture can be uploaded from 32- and 64-bit Windows.
+
[''Samba_printer_name'']
 +
        path = /var/spool/samba/
 +
        printable = yes
 +
        printer name = ''printer_name_in_the_back_end''
  
 +
: Set the <code>printer name</code> parameter to the name of the printer used in the local print server back end.
  
The following steps are done on Windows7 64-bit, because 64-bit Windows allows uploading drivers for x86 and x64:
+
* Reload Samba:
  
* Logon with an account, that has [[#Granting_print_operator_privileges|granted print operator privileges]] to.
+
  # smbcontrol all reload-config
 
 
* Go to \\YourPrintserver and click the „View remote printers“ button
 
:[[Image:Server_Share_List.png]]
 
 
 
* You will see a list of all printers you have shared.
 
: [[Image:View_remote_printers.png]]
 
 
 
* Right-click somewhere in the empty part of the window and choose „Server Properties...“ from the appearing context menu.
 
 
 
* Next go to the „Drivers“ tab and click the „Add...“ button. The „Add Printer wizzard will appear.
 
 
 
* Select the driver architecture you want to upload (upload one by one) and click „Next“.
 
 
 
* Click the „Have Disk...“ button and browse to the directory containing the driver you want to upload.
 
 
 
* The wizzard will show you a list of all drivers, the directory you pointed to, contains. Select the appropriate driver for your printer and click „Next“.
 
:Remember: If you upload drivers for additional architectures for one printer, they need all to have exactly the same name!  Otherwise the driver can't be associated and used with different platforms!
 
:[[Image:Printer_driver_selection.png]]
 
 
 
* In the end, the wizzard will copy all required files to the print$ share of your print server.
 
 
 
* If you want to upload drivers for a different plattform or other devices, repeat the steps.
 
 
 
 
 
 
 
== Associating a shared printer with a driver and preconfiguring==
 
 
 
* Logon with an account, that has [[#Granting_print_operator_privileges|granted print operator privileges]] to.
 
 
 
* Go to \\YourPrintserver and click the „View remote printers“ button.
 
:[[Image:Server_Share_List.png]]
 
 
 
* You will see a list of all printers you have shared.
 
:[[Image:View_remote_printers.png]]
 
 
 
* You could do the association of the driver with the printer share on Windows or on *nix side:
 
 
 
:* On Windows:
 
 
 
::* Right-click to the shared printer, you would associate a driver with and choose „Properties“.
 
 
 
::* If there's no driver associated with an printer yet, you'll been asked if you want to install the driver now. Answer this question with „No“!
 
:::[[Image:Question_install_driver.png]]
 
 
 
::* A default printer properties window will appear. Go to the „Advanved“ tab and choose the already uploaded driver from the list, that is suitable for the printer.
 
:::[[Samba_as_a_print_server#An_uploaded_driver_is_not_shown_in_the_list.2C_when_trying_to_associate_it_with_a_printer|FAQ: An uploaded driver is not shown in the list, when trying to associate it with a printer]].
 
:::[[Image:Choose_driver.png]]
 
 
 
::* Close the windows with „OK“ to associate the driver with the printer.
 
 
 
::* If you do this step on Vista or higher, Windows will ask you, if you trust the server (This can be suppressed by a GPO. See [[#Setting_up_a_GPO_for_trusting_printer_drivers|Setting up a GPO for trusting printer drivers]]). Choose „Install driver“, if you are seeing this window.
 
:::[[Image:Question_trust_printer.png]]
 
 
 
::* After associating the driver, Windows renames the printer to the driver name. You can leave that or rename it again. For more clearness, it's better to set the name on Windows side to the one you used in your smb.conf.
 
 
 
:* On *nix:
 
 
 
::* Retrieve a list of all drivers, that are on the print$ share <pre># rpcclient localhost -U administrator -c 'enumdrivers'</pre>
 
 
 
::* Associate the driver with the printer (The driver name, must be exactly the same, like in the output of the above „enumdrivers“ output): <pre># rpcclient localhost -U administrator -c 'setdriver "MyDemoPrinter" "HP Universal Printing PS"'</pre>
 
 
 
::* You can review the associations with <pre># rpcclient localhost -U administrator -c 'enumprinters'</pre>
 
 
 
* On Windows, now right-click and choose „Properties“ again, to preconfigure the printer.
 
 
 
* First you should take a look on the tabs on the properties windows. Typically there's a tab called „Device Settings“, „Settings“, „Configuration“ or something like that (depending on the driver). This usually allows you to configure the main printer settings (number of trays, duplex on/off, etc.). Set the values fitting to your device and click the „Apply“ button.
 
:[[Image:Device_Settings.png]]
 
 
 
* On the „Sharing“ tab, you can check „List in the directory“, to publish the printer in your Active Directory, what makes it easier for users to find.
 
 
 
* To preconfigure the printers default settings, go to the „Advanced“ tab and click the „Printing defaults...“ button. A new window will appear. It's layout and possibilities differ and depent on the driver. Here you can set the default values, the user will receive, when connecting the printer.
 
:[[Image:Printing_defaults.png]]
 
 
 
* If you have finished configuring your printer, save all changes with „OK“.
 
 
 
If you had uploaded drivers for multiple architectures to that printer, the settings will be retrieved connecting on the different plattforms - regardless on which they have been set. But as mentioned earlier, this requires, that all drivers for each plattform have the same name (versions can differ).
 
 
 
Now it's time to connect to the printer and print a test page.
 
 
 
 
 
 
 
 
 
 
 
= Setting up a GPO for trusting printer drivers =
 
 
 
To keep the following guide simple, we setup the policy in the „Default Domain Policy“. If you have different requirements, adapt it to your needs.
 
 
 
* Open the Group Policy Management console.
 
 
 
* Go to „Forest: your.domain“ / „Domains“ / „your.domain“
 
 
 
* Right-click „Default Domain Policy“ and choose „Edit“ to open the Group Policy Management Editor.
 
:[[Image:Edit_group_policy.png]]
 
 
 
* Navigate to „Computer Configuration“ / „Policies“ / „Administrative Templates“ / „Printers“ and double-click to the „Point and Print Restrictions“ Policy (if you want to setup the policy on a per-user base instead of machine-base, go to the same path, but just in the „User Configuration“ branch).
 
 
 
* Enable the policy and set „When installing driver for a new connection“ and „When updating drivers for an existing connection“ each to „Do not show warning or elevation prompt“. You can restrict the policy in that window to prevent the warning just for defined hosts, too, if required..
 
:[[Image:Point_and_print_restrictions.png]]
 
 
 
* Save the changed policy by clicking „OK“ and closing the windows.
 
 
 
After the clients have refreshed their policies (per default every 90 minutes, with a random offset of 0 to 30 minutes), the warning won't be shown up any more. The policy refresh can be forced by
 
 
 
> gpupdate /force /target:computer
 
 
 
 
 
 
 
 
 
 
 
= Enabling new paper sizes (Forms) =
 
 
 
Only standard sizes of formulars are included by default. If you require other forms, you have to add them.
 
 
 
* Logon with an account, that has [[#Granting_print_operator_privileges|granted print operator privileges]] to.
 
 
 
* Go to \\YourPrintserver and click the „View remote printers“ button
 
:[[Image:Server_Share_List.png]]
 
 
 
* You will see a list of all printers you have shared.
 
:[[Image:View_remote_printers.png]]
 
 
 
* Right-click somewhere in the empty part of the window and choose „Server Properties...“ from  the appearing context menu. The print server forms tab appears.
 
 
 
* Check „Create a new form“, and fill the values. In the end click „Save Form“, to save your changes.
 
:[[Image:Create_new_form.png]]
 
 
 
The new added paper sizes will be selectable from all printer dialogs now.
 
 
 
 
 
 
 
 
 
 
 
= FAQ =
 
  
== An uploaded driver is not shown in the list, when trying to associate it with a printer ==
 
  
Windows clients only permit associating a driver with a printer, when the uploaded driver matches the architecture reported by the spoolss server. Samba reports "Windows NT x86" by default.
 
  
This causes, that when you had uploaded just a 64-bit driver, you won't see it in the list, when you try to associate it with the printer it's „advanced“ tab.
 
  
There are three ways to workaround:
 
  
* Set the following (undocumented) parameter in your <tt>[global]</tt> section of your smb.conf, to make spoolss announce itself as x64 architecture:
+
= Setting up Automatic Printer Driver Download for Windows Clients =
spoolss: architecture = Windows x64
 
  
* Assign the driver with <tt>rpcclient</tt>.
+
See [[Setting_up_Automatic_Printer_Driver_Downloads_for_Windows_Clients|Setting up Automatic Printer Driver Downloads for Windows Clients]].
  
* Additionally upload a x86 version of the driver with exactly the same name.
 
  
  
  
== Point'n' Print doesn't deliver the drivers on all architectures ==
 
  
Make sure that you have uploaded exactly the same driver for that printer for all architectures. E. g. „HP Universal Printing PS“ for x86 and „HP Universal Printing PS (v5.5.0)“ for x64 wouldn't match, even if they are shipped in the same driver package!
+
----
 +
[[Category:Active Directory]]
 +
[[Category:Domain Members]]
 +
[[Category:NT4 Domains]]
 +
[[Category:Printing]]
 +
[[Category:Standalone Server]]

Latest revision as of 15:15, 18 November 2019

Introduction

If you set up Samba as a print server, clients in your network are able to send print jobs to the Samba host using the server message block (SMB) protocol. The examples shown in this documentation use a raw printer in the back end. This configuration requires that the print job is formatted by a driver on the client and thus can be processed by the printer without further processing or filtering.



Supported Print Server Back Ends

Samba supports the multiple print server back ends, such as CUPS and LPRng. For a complete list, see the printing parameter in the smb.conf(5) man page.

For details how to set up the back end, see the print server's documentation.


Samba CUPS or IPRINT Back End Support

When using the CUPS or IPRINT print server back end, Samba must have been built with CUPS support enabled. To verify, enter:

# smbd -b | grep "HAVE_CUPS"
   HAVE_CUPS

If no output is displayed:



Adding a printer to the Print Server Back End

CUPS

To add a raw printer to an CUPS print server:

  • Open the CUPS admin web interface in your browser. For example, https://servername:631/admin
  • Select the Administration tab and click Add Printer.
  • Select the connection type and enter the corresponding URL to the printer's queue or to the remote print server queue. For example:
  • LPD-based printers: lpd://printer_name/queue
  • IPP (Internet Printing Protocol)-based printers: ipp://printer_name/ipp/port
  • SMB (Server Message Block)-based printers: smb://username:password@domain/windows_print_server_host_name/printer_name
Note that forwarding a job to a print server running Windows Vista or newer, or Windows Server 2008 or newer requires authentication.
  • Enter a name for the printer. This name is used in the smb.conf when sharing the printer using Samba.
  • Select the Raw printer vendor and model.
  • Save the settings.


LPRng

To add a raw printer to a LPRng print server:

  • Add the following line to the /etc/printcap file:
printer_name:sd=/var/spool/lpd/printer_name/:sh:mx=0:mc=0:rm=Printer_DNS_name_or_IP_address
The printer name is used in the smb.conf when sharing the printer using Samba.
For further details about the options used, see the printcap(5) man page.
  • To create the spool directory, enter:
# checkpc -f
  • Restart the LPRng service.



Enabling the spoolssd Service

The Samba spoolssd is a service that is integrated into the smbd service. If you configured Samba as a print server, you can additionally enable spoolssd to increase performance on print servers with a high number of jobs or printers.

Without spoolssd, Samba forks the smbd process or each print job and initializes the printcap cache. In case of a large number of printers, the smbd service can become unresponsive for multiple seconds when initializing the cache. The spoolssd service enables you to start pre-forked smbd processes that are processing print jobs without any delay. The main spoolssd smbd process uses a low amount of memory, and forks and terminates child processes

To enable the spoolssd service:

  • Edit the [global] section in your smb.conf file:
  • Add the following parameters:
rpc_server:spoolss = external
rpc_daemon:spoolssd = fork
  • Optionally, you can set the following parameters:
Parameter Default Description
spoolssd:prefork_min_children 5 Minimum number of child processes
spoolssd:prefork_max_children 25 Maximum number of child processes
spoolssd:prefork_spawn_rate 5 Samba forks this number of new child processes, up to the value set in spoolssd:prefork_max_children, if a new connection is established
spoolssd:prefork_max_allowed_clients 100 Number of clients, a child process serves
spoolssd:prefork_child_min_life 60 Minimum lifetime of a child process in seconds. 60 seconds is the minimum.
  • Restart Samba.

After the restart, Samba automatically starts smbd sub-processes:

# ps axf
...
30903 smbd
30912  \_ smbd
30913      \_ smbd
30914      \_ smbd
30915      \_ smbd
...

Enabling the Print Server Support in Samba

To enable the print server support:

  • Set the printing back end in the printing parameter of the [global] section in your smb.conf file. For example:
printing = CUPS
  • Add the following section to your smb.conf:
[printers]
       path = /var/spool/samba/
       printable = yes
  • Create the spool directory set in the path parameter:
# mkdir -p /var/spool/samba/
# chmod 1777 /var/spool/samba/
  • Reload Samba:
# smbcontrol all reload-config



Sharing a Printer

Automatic Sharing of All Printers Configured in the Print Server Back End

Using the default setting, all printers configured in the print server back end are automatically shared.


Disabling the Automatic Printer Sharing

To disable the automatic printer sharing:

  • Add the following parameter to the [global] section of your smb.conf file:
load printers = no
  • Reload Samba:
# smbcontrol all reload-config


Manual Sharing of Printers

To manually share a printer:

  • Add the share for the printer to your smb.conf file:
[Samba_printer_name]
       path = /var/spool/samba/
       printable = yes
       printer name = printer_name_in_the_back_end
Set the printer name parameter to the name of the printer used in the local print server back end.
  • Reload Samba:
# smbcontrol all reload-config



Setting up Automatic Printer Driver Download for Windows Clients

See Setting up Automatic Printer Driver Downloads for Windows Clients.