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

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(Fixed incorrect location of the "printing" parameter. It must be set in [global], not in [printers].)
 
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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 with 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.'''
 
  
== Some definitions ==
 
  
; Printer share : Each printer is shared by a name. During the printing process, the client sends the printjob to it.
+
= Supported Print Server Back Ends =
  
; Print server backend : Samba can use e. g. CUPS, LPD/Lprng and others as backend. The print server forwards the job to local or network printers.
+
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.
  
; 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.
+
{{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.
 +
}}
  
; Point'n'Print : Windows 2000 and later support the ability to automatically download, install and preconfigure drivers from the server when connecting a printer. The installation can be carried out by ordinary users without special permissions.
+
For details how to set up the back end, see the print server's documentation.
  
; Printer forms : Windows is already shipped with an amount of forms, that define the typical paper sizes. If a form isn't known to the print server, the client cannot use this, although the printer is able to do it.
 
  
== Driver models ==
 
  
Supported by Samba: Printer driver version 3 (Windows 2000 to Windows 8)
+
== 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
 +
 
 +
If no output is displayed:
 +
* Samba was built using the <code>--disable-cups</code> parameter.
 +
* 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)
 
  
  
  
  
 +
= Adding a printer to the Print Server Back End =
  
= Print server backend =
+
== CUPS ==
  
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.
+
To add a raw printer to an CUPS print server:
  
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.
+
* Open the CUPS admin web interface in your browser. For example, <nowiki>https://servername:631/admin</nowiki>
  
We assume here, that you have the print server backend already basically configured and it's running, so printers can be added next.
+
* Select the <code>Administration</code> tab and click <code>Add Printer</code>.
  
 +
* 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.
  
== CUPS ==
+
* Select the <code>Raw</code> printer vendor and model.
  
[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.
+
* Save the settings.
  
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.
 
  
  
 +
== LPRng ==
  
=== Adding a new printer ===
+
To add a raw printer to a LPRng print server:
  
* Open the CUPS admin webfrontend (https://servername:631/admin).
+
* Add the following line to the <code>/etc/printcap</code> file:
  
* On the „Administration“ tab click the „Add Printer“ button.
+
''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.
  
* Choose the way that your printer is connected and enter the appropriate URL.
+
* To create the spool directory, enter:
  
Examples:
+
# checkpc -f
  
# LPD protocol
+
* Restart the LPRng service.
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
 
  
* When you reach the step to choose the vendor and model, choose „Raw“ for both, because the rendering will be done later by the Windows driver.
 
  
* Save the newly added printer.
 
  
== LPD ==
 
  
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].
+
= Enabling the <code>spoolssd</code> Service =
  
 +
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:
 +
* Support package-aware Windows drivers.
 +
* 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
  
 +
To enable the <code>spoolssd</code> service:
  
=== Adding a new printer ===
+
* Edit the <code>[global]</code> section in your <code>smb.conf</code> file:
  
* 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 parameters:
  
  PRINTERNAME:sd=/path/to/spool/directory:sh:mx=0:mc=0:rm=IP_or_DNS_Name
+
  rpc_server:spoolss = external
 +
rpc_daemon:spoolssd = fork
  
* 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.
+
:* 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.
 +
|}
  
# checkpc -f
+
* Restart Samba.
# service lpd restart
 
  
* The following command allows you query the state of the printer:
+
After the restart, Samba automatically starts <code>smbd</code> sub-processes:  
 +
# ps axf
 +
...
 +
30903 smbd
 +
30912  \_ smbd
 +
30913      \_ smbd
 +
30914      \_ smbd
 +
30915      \_ smbd
 +
...
  
# lpq -P PRINTERNAME
 
Printer: PRINTERNAME@SAMPRINTSERVER (dest PRINTERNAME@IP_or_DNS_Name)
 
  Queue: no printable jobs in queue
 
Ready
 
 
no entries
 
  
  
  
  
 +
= Enabling the Print Server Support in Samba =
  
= Configuring Samba as print server =
+
To enable the print server support:
  
== General ==
+
* 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
  
=== Enabling spoolssd (optional) ===
+
* Add the following section to your <code>smb.conf</code>:
  
''Note: Some features of spoolssd were broken before 4.0.17 and 4.1.7. That's why it is recommended to use at least these versions!''
+
[printers]
 +
        path = /var/spool/samba/
 +
        printable = yes
  
spoolssd is a feature, introduced in Samba 4.0, that increases printer performance. In the past, when a print job came in, a smbd child process was forked, to initialize the printcap cache, spoolss, etc. If you have a huge printcap cache and it needs to be updated first, the client could hang for several seconds.
+
* Create the spool directory set in the <code>path</code> parameter:
  
Since Samba 4, you can configure spoolssd to be started as forked processes. If enabled, you'll see additional smbd processes, which will handle only spoolss requests. The master process is a simple daemon with a small memory footprint, that only forks and kills childs serving the spoolss pipe. When a connection comes in, it can directly start to talk to the daemon and ask for information about the printer without any delay, this gives a performance improvement.
+
# mkdir -p /var/spool/samba/
 +
# chmod 1777 /var/spool/samba/
  
To enable spoolssd, add the following to the [global] section of your smb.conf:
+
* Reload Samba:
 +
 
 +
# smbcontrol all reload-config
  
rpc_server:spoolss = external
 
rpc_daemon:spoolssd = fork
 
  
After you have restarted Samba, you will discover additional smbd processes that handle spoolss requests:
 
  
With spoolssd enabled after startup:      With spoolssd disabled (default):
 
30903 smbd                                30955 smbd
 
30912  \_ smbd                            30963  \_ smbd
 
30913      \_ smbd
 
30914      \_ smbd
 
30915      \_ smbd
 
30916      \_ smbd
 
30917      \_ smbd
 
30918      \_ smbd
 
30920      \_ smbd
 
30921      \_ smbd
 
30922      \_ smbd
 
30923      \_ smbd
 
30924      \_ smbd
 
  
You can adjust the daemons behaviour through the following parameters (the values in the examples are the defaults):
 
  
spoolssd:prefork_min_children = 5          # Minimum number of child processes
+
= Sharing a Printer =
spoolssd:prefork_max_children = 25          # Maximum number of child processes
 
spoolssd:prefork_spawn_rate = 5            # Start (fork) x new childs if one connection comes in (up to prefork_max_children)
 
spoolssd:prefork_max_allowed_clients = 100  # Number of clients, a child process should be responsible for
 
spoolssd:prefork_child_min_life = 60        # Minimum lifetime of a child process (60 seconds
 
                                            # is the minimum, even a lower value has been configured)
 
  
spoolssd is still a new feature. If you encounter any bug, please report it at [https://bugzilla.samba.org/ https://bugzilla.samba.org/], to get it fixed as soon as possible.
+
== Automatic Sharing of All Printers Configured in the Print Server Back End ==
  
=== Granting print operator privileges ===
+
Using the default setting, all printers configured in the print server back end are automatically shared.
  
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.
 
  
The following example grants the privilege to the domain group „Domain Admins“:
 
  
# net rpc rights grant 'SAMDOM\Domain Admins' SePrintOperatorPrivilege -Uadministrator
+
=== Disabling the Automatic Printer Sharing ===
  
Existing privileges can be reviewed with
+
To disable the automatic printer sharing:
  
# net rpc rights list accounts -Uadministrator
+
* Add the following parameter to the <code>[global]</code> section of your <code>smb.conf</code> file:
  
=== Setup the [printers] share ===
+
load printers = no
  
This share defines general information about your printing backend. See the „[printers]“ section in the man page for additional information.
+
* Reload Samba:
 +
 
 +
# smbcontrol all reload-config
  
* Add the new section to your smb.conf
 
[printers]
 
      path = /var/spool/samba
 
      printable = yes
 
      printing = CUPS|LPRNG|...
 
  
* If you choose CUPS as backend, make sure that your smbd is compiled with CUPS support:
 
# 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 on your needs.
+
== Manual Sharing of Printers ==
  
# mkdir -p /var/spool/samba/
+
To manually share a printer:
# chmod 1777 /var/spool/samba/
 
  
=== Setup the [print$] share ===
+
* Verify that the automatic printer sharing is disabled. See [[#Disabling_the_Automatic_Printer_Sharing|Disabling the Automatic Printer Sharing]].
  
To enable Point'n'Print support, a share named „print$“ must exist. This share name is hardcoded in Windows clients and can't be altered.
+
* Add the share for the printer to your <code>smb.conf</code> file:
  
* Add the share to your smb.conf
+
[''Samba_printer_name'']
 +
        path = /var/spool/samba/
 +
        printable = yes
 +
        printer name = ''printer_name_in_the_back_end''
  
[print$]
+
: Set the <code>printer name</code> parameter to the name of the printer used in the local print server back end.
      path = /srv/samba/Printer_drivers
 
      comment = Printer Drivers
 
      writeable = yes
 
  
* Create the folder that will later contain the drivers:
+
* Reload Samba:
  
  # mkdir -p /srv/samba/Printer_drivers/
+
  # smbcontrol all reload-config
  
* Next we create the required directory structure for the print$ share (newer versions of Samba will create it on the fly):
 
  
BASEDIR=/srv/samba/Printer_drivers
 
for i in COLOR IA64 W32ALPHA W32MIPS W32PPC W32X86/{2,3} WIN40 x64; do
 
      mkdir -p $BASEDIR/$i;
 
done
 
  
* Finally, set the permissions. It is recommended that normal users just have read-only access to the share, while the group you have [[#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.
 
  
:* If you're running Samba 4 and later, you are having the choice to use [[Shares_with_POSIX_ACLs#Change_permissions_on_folders_of_a_share|POSIX]] or [[Shares_with_Windows_ACLs#Change_permissions_on_folder_of_a_share|Windows ACLs]] on the print$ share. The benefit of Windows ACLs are, that you can use the full Windows ACLs set. Have a look at the [[Shares_with_Windows_ACLs#Change_permissions_on_folder_of_a_share|Setup and configure file shares]] documentation for further details. The suggested filesystem permissions for Windows ACLs on the print$ share are:
 
::* 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)
 
  
:* ACL example for POSIX ACLs on the print$ share (e. g. for Samba 3.x)
+
= Setting up Automatic Printer Driver Download for Windows Clients =
# chgrp -R „SAMDOM\Domain Admins“ /srv/samba/Printer_drivers/
 
# chmod -R 2755 /srv/samba/Printer_drivers/
 
  
== Sharing a printer with Samba ==
+
See [[Setting_up_Automatic_Printer_Driver_Downloads_for_Windows_Clients|Setting up Automatic Printer Driver Downloads for Windows Clients]].
  
* 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:
 
  
[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
+
----
 +
[[Category:Active Directory]]
 +
[[Category:Domain Members]]
 +
[[Category:NT4 Domains]]
 +
[[Category:Printing]]
 +
[[Category:Standalone Server]]

Latest revision as of 12:03, 18 October 2017

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:

  • Support package-aware Windows drivers.
  • 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.