[thirdparty/cups.git] / doc / help / ref-cupsd-conf.html.in

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<H1 CLASS="title">cupsd.conf</H1>

<P>The <VAR>/etc/cups/cupsd.conf</VAR> file contains
configuration <I>directives</I> that control how the server
functions. Each directive is listed on a line by itself followed
by its value. Comments are introduced using the number sign ("#")
character at the beginning of a line.</P>

<P>Since the server configuration file consists of plain text,
you can use your favorite text editor to make changes to it.
After making any changes, restart the <CODE>cupsd(8)</CODE>
process using the startup script for your operating system:</P>

<UL>

	<LI>AIX, Linux, Solaris:
	<PRE CLASS="command">
/etc/init.d/cups restart
	</PRE></LI>

	<LI>HP-UX:
	<PRE CLASS="command">
/sbin/init.d/cups restart
	</PRE></LI>

	<LI>MacOS X:
	<PRE CLASS="command">
sudo launchctl unload /System/Library/LaunchDaemons/org.cups.cupsd.plist
sudo launchctl load /System/Library/LaunchDaemons/org.cups.cupsd.plist
	</PRE></LI>

</UL>

<P>You can also edit this file from the CUPS web interface, which
automatically handles restarting the scheduler.</P>

<BLOCKQUOTE><B>Note:</B>

<P>The specification of time units ("w" for weeks, "h" for hours, etc.) in the various time interval directives is new in CUPS 1.6/OS X 10.8. Prior releases of CUPS only supported time intervals in seconds.</P>

</BLOCKQUOTE>


<H2 CLASS="title"><A NAME="AccessLogLevel">AccessLogLevel</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
AccessLogLevel config
AccessLogLevel actions
AccessLogLevel all
</PRE>

<H3>Description</H3>

<P>The <CODE>AccessLogLevel</CODE> directive controls which requests are logged
to the access log file. The following levels are defined:</P>

<UL>

	<LI><CODE>config</CODE>; Log when printers and classes are added,
	deleted, or modified and when configuration files are accessed or
	updated.</LI>

	<LI><CODE>actions</CODE>; Log when print jobs are submitted,
	held, released, modified, or canceled, and any of the conditions
	for <CODE>config</CODE>.</LI>

	<LI><CODE>all</CODE>; Log all requests.</LI>

</UL>

<P>The default access log level is <CODE>@CUPS_ACCESS_LOG_LEVEL@</CODE>.</P>


<H2 CLASS="title"><A NAME="Allow">Allow</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  ...
  Allow from All
  Allow from None
  Allow from *.example.com
  Allow from .example.com
  Allow from host.example.com
  Allow from nnn.*
  Allow from nnn.nnn.*
  Allow from nnn.nnn.nnn.*
  Allow from nnn.nnn.nnn.nnn
  Allow from nnn.nnn.nnn.nnn/mm
  Allow from nnn.nnn.nnn.nnn/mmm.mmm.mmm.mmm
  Allow from [xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx]
  Allow from [xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx]/mmm
  Allow from @LOCAL
  Allow from @IF(name)
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>Allow</CODE> directive specifies a hostname, IP
address, or network that is allowed access to the server.
<CODE>Allow</CODE> directives are cumulative, so multiple
<CODE>Allow</CODE> directives can be used to allow access for
multiple hosts or networks.</P>

<P>Host and domain name matching require that you enable the <A
HREF="#HostNameLookups"><CODE>HostNameLookups</CODE></A>
directive.</P>

<P>The <CODE>/mm</CODE> notation specifies a CIDR netmask, as shown in
<A HREF="#TABLE1">Table 1</A>.</P>

<DIV CLASS="table"><TABLE SUMMARY="CIDR Netmasks">
<CAPTION>Table 1: <A NAME="TABLE1">CIDR Netmasks</A></CAPTION>
<TR>
	<TH WIDTH="10%">mm</TH>
	<TH WIDTH="20%">netmask</TH>
	<TH WIDTH="10%">mm</TH>
	<TH WIDTH="20%">netmask</TH>
</TR>
<TR>
	<TD ALIGN="CENTER">0</TD>
	<TD ALIGN="CENTER">0.0.0.0</TD>
	<TD ALIGN="CENTER">8</TD>
	<TD ALIGN="CENTER">255.0.0.0</TD>
</TR>
<TR>
	<TD ALIGN="CENTER">1</TD>
	<TD ALIGN="CENTER">128.0.0.0</TD>
	<TD ALIGN="CENTER">16</TD>
	<TD ALIGN="CENTER">255.255.0.0</TD>
</TR>
<TR>
	<TD ALIGN="CENTER">2</TD>
	<TD ALIGN="CENTER">192.0.0.0</TD>
	<TD ALIGN="CENTER">24</TD>
	<TD ALIGN="CENTER">255.255.255.0</TD>
</TR>
<TR>
	<TD ALIGN="CENTER">...</TD>
	<TD ALIGN="CENTER">...</TD>
	<TD ALIGN="CENTER">32</TD>
	<TD ALIGN="CENTER">255.255.255.255</TD>
</TR>
</TABLE></DIV>

<P>The <CODE>@LOCAL</CODE> name will allow access from all local
interfaces. The <CODE>@IF(name)</CODE> name will allow access
from the named interface. In both cases, CUPS only allows access
from the network that the interface(s) are configured for -
requests  arriving on the interface from a foreign network will
<em>not</em> be accepted.</P>

<P>The <CODE>Allow</CODE> directive must appear inside a <A
HREF="#Location"><CODE>Location</CODE></A> or <A
HREF="#Limit"><CODE>Limit</CODE></A> section.</P>


<H2 CLASS="title"><A NAME="AuthType">AuthType</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  ...
  AuthType None
  AuthType Basic
  AuthType Digest
  AuthType BasicDigest
  AuthType Negotiate
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>AuthType</CODE> directive defines the type of
authentication to perform:</P>

<UL>

	<LI><CODE>None</CODE> - No authentication should be
	performed (default)</LI>

	<LI><CODE>Basic</CODE> - Basic authentication should be
	performed using the UNIX password and group files</LI>

	<LI><CODE>Digest</CODE> - Digest authentication should be
	performed using the <VAR>/etc/cups/passwd.md5</VAR>
	file</LI>

	<LI><CODE>BasicDigest</CODE> - Basic authentication
	should be performed using the
	<VAR>/etc/cups/passwd.md5</VAR> file</LI>

	<LI><CODE>Negotiate</CODE> - Kerberos authentication
	should be performed</LI>

</UL>

<P>When using <CODE>Basic</CODE>, <CODE>Digest</CODE>,
<CODE>BasicDigest</CODE>, or <CODE>Negotiate</CODE> authentication,
clients connecting through the <CODE>localhost</CODE> interface can
also authenticate using certificates.</P>

<P>The <CODE>AuthType</CODE> directive must appear inside a <A
HREF="#Location"><CODE>Location</CODE></A> or <A
HREF="#Limit"><CODE>Limit</CODE></A> section.</P>


<H2 CLASS="title"><A NAME="AutoPurgeJobs">AutoPurgeJobs</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
AutoPurgeJobs Yes
AutoPurgeJobs No
</PRE>

<H3>Description</H3>

<P>The <CODE>AutoPurgeJobs</CODE> directive specifies whether or
not to purge completed jobs once they are no longer required for
quotas. This option has no effect if quotas are not enabled. The
default setting is <CODE>No</CODE>.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="BrowseLocalProtocols">BrowseLocalProtocols</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
BrowseLocalProtocols all
BrowseLocalProtocols none
BrowseLocalProtocols dnssd
</PRE>

<H3>Description</H3>

<P>The <CODE>BrowseLocalProtocols</CODE> directive specifies the protocols to use when advertising local shared printers on the network. Multiple protocols can be specified by separating them with spaces. The default is "<CODE>dnssd</CODE>" on systems that support Bonjour and "<CODE>none</CODE>" on all others.</P>


<H2 CLASS="title"><A NAME="BrowseWebIF">BrowseWebIF</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
BrowseWebIF On
BrowseWebIF Off
</PRE>

<H3>Description</H3>

<P>The <CODE>BrowseWebIF</CODE> directive controls whether the CUPS web
interface is advertised via DNS-SD. The default setting is
<CODE>Off</CODE>.</P>


<H2 CLASS="title"><A NAME="Browsing">Browsing</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
Browsing On
Browsing Off
</PRE>

<H3>Description</H3>

<P>The <CODE>Browsing</CODE> directive controls whether or not printer sharing is enabled. The default setting is <CODE>On</CODE>.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.7</SPAN><A NAME="Classification">Classification</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
Classification
Classification classified
Classification confidential
Classification secret
Classification topsecret
Classification unclassified
</PRE>

<H3>Description</H3>

<P>The <CODE>Classification</CODE> directive sets the
classification level on the server. When this option is set, at
least one of the banner pages is forced to the classification
level, and the classification is placed on each page of output.
The default is no classification level.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.10</SPAN><A NAME="ClassifyOverride">ClassifyOverride</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
ClassifyOverride Yes
ClassifyOverride No
</PRE>

<H3>Description</H3>

<P>The <CODE>ClassifyOverride</CODE> directive specifies whether
users can override the default classification level on the
server. When the server classification is set, users can change
the classification using the <CODE>job-sheets</CODE> option and
can choose to only print one security banner before or after the
job. If the <CODE>job-sheets</CODE> option is set to
<CODE>none</CODE> then the server default classification is
used.</P>

<P>The default is to not allow classification overrides.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="DefaultAuthType">DefaultAuthType</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
DefaultAuthType Basic
DefaultAuthType BasicDigest
DefaultAuthType Digest
DefaultAuthType Negotiate
</PRE>

<H3>Description</H3>

<P>The <CODE>DefaultAuthType</CODE> directive specifies the type
of authentication to use for IPP operations that require a
username. The default is <CODE>Basic</CODE>.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="DefaultEncryption">DefaultEncryption</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
DefaultEncryption Never
DefaultEncryption IfRequested
DefaultEncryption Required
</PRE>

<H3>Description</H3>

<P>The <CODE>DefaultEncryption</CODE> directive specifies the
type of encryption to use when performing authentication. The
default is <CODE>Required</CODE>.</P>


<H2 CLASS="title"><A NAME="DefaultLanguage">DefaultLanguage</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
DefaultLanguage de
DefaultLanguage en
DefaultLanguage es
DefaultLanguage fr
DefaultLanguage it
</PRE>

<H3>Description</H3>

<P>The <CODE>DefaultLanguage</CODE> directive specifies the
default language to use for client connections. Setting the
default language also sets the default character set if a
language localization file exists for it. The default language
is "en" for English.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.4/OS X 10.6</SPAN><A NAME="DefaultPaperSize">DefaultPaperSize</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
DefaultPaperSize Letter
DefaultPaperSize A4
DefaultPaperSize Auto
DefaultPaperSize None
</PRE>

<H3>Description</H3>

<P>The <CODE>DefaultPaperSize</CODE> directive specifies the default paper
size to use when creating new printers. The default is <CODE>Auto</CODE>
which uses a paper size appropriate for the system default locale. A value
of <CODE>None</CODE> tells the scheduler to not set the default paper
size.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="DefaultPolicy">DefaultPolicy</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
DefaultPolicy default
DefaultPolicy authenticated
DefaultPolicy foo
</PRE>

<H3>Description</H3>

<P>The <CODE>DefaultPolicy</CODE> directive specifies the default
policy to use for IPP operation. The default is
<CODE>default</CODE>. CUPS also includes a policy called
<CODE>authenticated</CODE> that requires a username and password for printing
and other job operations.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="DefaultShared">DefaultShared</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
DefaultShared Yes
DefaultShared No
</PRE>

<H3>Description</H3>

<P>The <CODE>DefaultShared</CODE> directive specifies whether printers are shared (published) by default. The default is <CODE>Yes</CODE>.</P>


<H2 CLASS="title"><A NAME="Deny">Deny</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  ..
  Deny from All
  Deny from None
  Deny from *.example.com
  Deny from .example.com
  Deny from host.example.com
  Deny from nnn.*
  Deny from nnn.nnn.*
  Deny from nnn.nnn.nnn.*
  Deny from nnn.nnn.nnn.nnn
  Deny from nnn.nnn.nnn.nnn/mm
  Deny from nnn.nnn.nnn.nnn/mmm.mmm.mmm.mmm
  Deny from [xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx]
  Deny from [xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx]/mmm
  Deny from @LOCAL
  Deny from @IF(name)
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>Deny</CODE> directive specifies a hostname, IP
address, or network that is denied access to the server.
<CODE>Deny</CODE> directives are cumulative, so multiple
<CODE>Deny</CODE> directives can be used to deny access for
multiple hosts or networks.</P>

<P>Host and domain name matching require that you enable the <A
HREF="#HostNameLookups"><CODE>HostNameLookups</CODE></A>
directive.</P>

<P>The <CODE>/mm</CODE> notation specifies a CIDR netmask, a shown in
<A HREF="TABLE1">Table 1</A>.</P>

<P>The <CODE>@LOCAL</CODE> name will deny access from all local
interfaces. The <CODE>@IF(name)</CODE> name will deny access from
the named interface. In both cases, CUPS only denies access from
the network that the interface(s) are configured for - requests
arriving on the interface from a foreign network will
<em>not</em> be denied.</P>

<P>The <CODE>Deny</CODE> directive must appear inside a <A
HREF="#Location"><CODE>Location</CODE></A> or <A
HREF="#Limit"><CODE>Limit</CODE></A> section.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.4/OS X 10.6</SPAN><A NAME="DirtyCleanInterval">DirtyCleanInterval</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
DirtyCleanInterval 1w
DirtyCleanInterval 1d
DirtyCleanInterval 1h
DirtyCleanInterval 1m
DirtyCleanInterval 30
DirtyCleanInterval 0
</PRE>

<H3>Description</H3>

<P>The <CODE>DirtyCleanInterval</CODE> directive specifies the amount of time to wait before updating configuration and state files for printers, classes, subscriptions, and jobs in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix). A value of <CODE>0</CODE> causes the update to occur as soon as possible, typically within a few milliseconds.</P>

<P>The default value is <CODE>30</CODE> (30 seconds).</P>


<H2 CLASS="title"><A NAME="Encryption">Encryption</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  ...
  Encryption Never
  Encryption IfRequested
  Encryption Required
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>Encryption</CODE> directive must appear instead a <A
HREF="#Location"><CODE>Location</CODE></A> or <A
HREF="#Limit"><CODE>Limit</CODE></A> section and specifies the
encryption settings for that location. The default setting is
<CODE>IfRequested</CODE> for all locations.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.3/OS X 10.5</SPAN><A NAME="ErrorPolicy">ErrorPolicy</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
ErrorPolicy abort-job
ErrorPolicy retry-job
ErrorPolicy stop-printer
</PRE>

<H3>Description</H3>

<P>The <CODE>ErrorPolicy</CODE> directive defines the default policy that
is used when a backend is unable to send a print job to the
printer.</P>

<P>The following values are supported:</P>

<UL>

	<LI><CODE>abort-job</CODE> - Abort the job and proceed
	with the next job in the queue</LI>

	<LI><CODE>retry-job</CODE> - Retry the job after waiting
	for N seconds; the <VAR>cupsd.conf</VAR> <A
	HREF="#JobRetryInterval"><CODE>JobRetryInterval</CODE></A>
	directive controls the value of N</LI>

	<LI><CODE>retry-this-job</CODE> - Retry the current job immediately
	and indefinitely.</LI>

	<LI><CODE>stop-printer</CODE> - Stop the printer and keep
	the job for future printing; this is the default
	value</LI>

</UL>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.3</SPAN><A NAME="FilterLimit">FilterLimit</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
FilterLimit 0
FilterLimit 200
FilterLimit 1000
</PRE>

<H3>Description</H3>

<P>The <CODE>FilterLimit</CODE> directive sets the maximum cost
of all running job filters. It can be used to limit the number of
filter programs that are run on a server to minimize disk,
memory, and CPU resource problems. A limit of 0 disables filter
limiting.</P>

<P>An average print to a non-PostScript printer needs a filter
limit of about 200. A PostScript printer needs about half that
(100). Setting the limit below these thresholds will effectively
limit the scheduler to printing a single job at any time.</P>

<P>The default limit is 0.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.16</SPAN><A NAME="FilterNice">FilterNice</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
FilterNice 0
FilterNice 10
FilterNice 19
</PRE>

<H3>Description</H3>

<P>The <CODE>FilterNice</CODE> directive sets the <B>nice(1)</B>
value to assign to filter processes. The nice value ranges from
0, the highest priority, to 19, the lowest priority. The default
is 0.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.6/OS X 10.8</SPAN><A NAME="GSSServiceName">GSSServiceName</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
GSSServiceName http
GSSServiceName ipp
</PRE>

<H3>Description</H3>

<P>The <CODE>GSSServiceName</CODE> directive sets the Kerberos service name to use. The default is <CODE>http</CODE> for compatibility with Microsoft Windows.</P>


<H2 CLASS="title"><A NAME="HostNameLookups">HostNameLookups</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
HostNameLookups On
HostNameLookups Off
HostNameLookups Double
</PRE>

<H3>Description</H3>

<P>The <CODE>HostNameLookups</CODE> directive controls whether or
not CUPS looks up the hostname for connecting clients. The
<CODE>Double</CODE> setting causes CUPS to verify that the
hostname resolved from the address matches one of the addresses
returned for that hostname. <CODE>Double</CODE> lookups also
prevent clients with unregistered addresses from connecting to
your server.</P>

<P>The default is <CODE>Off</CODE> to avoid the potential server
performance problems with hostname lookups. Set this option to
<CODE>On</CODE> or <CODE>Double</CODE> only if absolutely
required.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.9</SPAN><A NAME="Include">Include</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
Include filename
Include /foo/bar/filename
</PRE>

<H3>Description</H3>

<P>The <CODE>Include</CODE> directive includes the named file in
the <CODE>cupsd.conf</CODE> file. If no leading path is provided,
the file is assumed to be relative to the <A
HREF="ref-cups-files-conf.html#ServerRoot"><CODE>ServerRoot</CODE></A> directory.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.5</SPAN><A NAME="JobPrivateAccess">JobPrivateAccess</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
JobPrivateAccess all
JobPrivateAccess default
JobPrivateAccess {user|@group|@ACL|@OWNER|@SYSTEM}+
</PRE>

<H3>Description</H3>

<P>The <CODE>JobPrivateAccess</CODE> directive specifies the access list for a
job's private values. The "default" access list is "@OWNER @SYSTEM". "@ACL" maps
to the printer's requesting-user-name-allowed or requesting-user-name-denied
values.</P>

<P>The <CODE>JobPrivateAccess</CODE> directive must appear inside a <A
HREF="#Policy"><CODE>Policy</CODE></A> section.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.5</SPAN><A NAME="JobPrivateValues">JobPrivateValues</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
JobPrivateValues all
JobPrivateValues default
JobPrivateValues none
JobPrivateValues attribute-name-1 [ ... attribute-name-N ]
</PRE>

<H3>Description</H3>

<P>The <CODE>JobPrivateValues</CODE> directive specifies the list of job values
to make private. The "default" values are "job-name",
"job-originating-host-name", "job-originating-user-name", and "phone".</P>

<P>The <CODE>JobPrivateValues</CODE> directive must appear inside a <A
HREF="#Policy"><CODE>Policy</CODE></A> section.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="JobRetryInterval">JobRetryInterval</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
JobRetryInterval 1w
JobRetryInterval 1d
JobRetryInterval 1h
JobRetryInterval 1m
JobRetryInterval 30
</PRE>

<H3>Description</H3>

<P>The <CODE>JobRetryInterval</CODE> directive specifies the amount of time to wait before retrying a job in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix). This is typically used for fax queues but can also be used with normal print queues whose error policy is <CODE>retry-job</CODE> or <CODE>retry-current-job</CODE>.</P>

<P>The default is <CODE>30</CODE> (30 seconds).</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.4/OS X 10.6</SPAN><A NAME="JobKillDelay">JobKillDelay</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
JobKillDelay 1w
JobKillDelay 1d
JobKillDelay 1h
JobKillDelay 1m
JobKillDelay 30
</PRE>

<H3>Description</H3>

<P>The <CODE>JobKillDelay</CODE> directive specifies the amount of time to wait before killing the filters and backend associated with a canceled or held job in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix).</P>

<P>The default is <CODE>30</CODE> (30 seconds).</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="JobRetryLimit">JobRetryLimit</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
JobRetryLimit 5
JobRetryLimit 50
</PRE>

<H3>Description</H3>

<P>The <CODE>JobRetryLimit</CODE> directive specifies the maximum
number of times the scheduler will try to print a job. This is
typically used for fax queues but can also be used with normal
print queues whose error policy is <CODE>retry-job</CODE>. The
default is 5 times.</P>


<H2 CLASS="title"><A NAME="KeepAlive">KeepAlive</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
KeepAlive On
KeepAlive Off
</PRE>

<H3>Description</H3>

<P>The <CODE>KeepAlive</CODE> directive controls whether or not
to support persistent HTTP connections. The default is
<CODE>On</CODE>.</P>

<P>HTTP/1.1 clients automatically support persistent connections,
while HTTP/1.0 clients must specifically request them using the
<CODE>Keep-Alive</CODE> attribute in the <CODE>Connection:</CODE>
field of each request.</P>


<H2 CLASS="title"><A NAME="KeepAliveTimeout">KeepAliveTimeout</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
KeepAliveTimeout 1w
KeepAliveTimeout 1d
KeepAliveTimeout 1h
KeepAliveTimeout 1m
KeepAliveTimeout 30
</PRE>

<H3>Description</H3>

<P>The <CODE>KeepAliveTimeout</CODE> directive controls how long a persistent HTTP connection will remain open after the last request in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix).</P>

<P>The default is <CODE>30</CODE> (30 seconds).</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.7</SPAN><A NAME="Limit">Limit (Location)</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  &lt;Limit GET POST&gt;
  ...
  &lt;/Limit&gt;

  &lt;Limit ALL&gt;
  ...
  &lt;/Limit&gt;
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>Limit</CODE> directive groups access control
directives for specific types of HTTP requests and must appear
inside a <A HREF="#Location"><CODE>Location</CODE></A> section.
Access can be limited for individual request types
(<CODE>DELETE</CODE>, <CODE>GET</CODE>, <CODE>HEAD</CODE>,
<CODE>OPTIONS</CODE>, <CODE>POST</CODE>, <CODE>PUT</CODE>, and
<CODE>TRACE</CODE>) or for all request types (<CODE>ALL</CODE>).
The request type names are case-sensitive for compatibility with
Apache.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="LimitIPP">Limit (Policy)</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Policy name&gt;
  &lt;Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer&gt;
  ...
  &lt;/Limit&gt;

  &lt;Limit All&gt;
  ...
  &lt;/Limit&gt;
&lt;/Policy&gt;
</PRE>

<H3>Description</H3>

<P>When included in <A HREF="#Policy"><CODE>Policy</CODE></A>
sections, the <CODE>Limit</CODE> directive groups access control
directives for specific IPP operations. Multiple operations can
be listed, separated by spaces. Table 2 lists the supported
operations.</P>

<DIV CLASS="table"><TABLE SUMMARY="Supported IPP Operations">
<CAPTION>Table 2: <A NAME="TABLE2">Supported IPP Operations</A></CAPTION>
<THEAD>
<TR>
	<TH>Operation Name</TH>
	<TH>Description</TH>
</TR>
</THEAD>
<TBODY>
<TR>
	<TD>All</TD>
	<TD>All operations - used as the default limit for
	operations that are not listed</TD>
</TR>
<TR>
	<TD>Cancel-Job</TD>
	<TD>Cancel a job</TD>
</TR>
<TR>
	<TD>Cancel-Subscription</TD>
	<TD>Cancel a subscription</TD>
</TR>
<TR>
	<TD>Create-Job</TD>
	<TD>Create a new, empty job</TD>
</TR>
<TR>
	<TD>Create-Job-Subscription</TD>
	<TD>Creates a notification subscription on a job</TD>
</TR>
<TR>
	<TD>Create-Printer-Subscription</TD>
	<TD>Creates a notification subscription on a printer</TD>
</TR>
<TR>
	<TD>CUPS-Accept-Jobs</TD>
	<TD>Sets the printer-is-accepting-jobs value for a printer to true</TD>
</TR>
<TR>
	<TD>CUPS-Add-Modify-Class</TD>
	<TD>Adds or modifies a class</TD>
</TR>
<TR>
	<TD>CUPS-Add-Modify-Printer</TD>
	<TD>Adds or modifies a printer</TD>
</TR>
<TR>
	<TD>CUPS-Authenticate-Job</TD>
	<TD>Authenticates a job for printing</TD>
</TR>
<TR>
	<TD>CUPS-Delete-Class</TD>
	<TD>Deletes a class</TD>
</TR>
<TR>
	<TD>CUPS-Delete-Printer</TD>
	<TD>Deletes a printer</TD>
</TR>
<TR>
	<TD>CUPS-Get-Classes</TD>
	<TD>Gets a list of classes</TD>
</TR>
<TR>
	<TD>CUPS-Get-Default</TD>
	<TD>Gets the (network/server) default printer or class</TD>
</TR>
<TR>
	<TD>CUPS-Get-Devices</TD>
	<TD>Gets a list of available devices</TD>
</TR>
<TR>
	<TD>CUPS-Get-PPDs</TD>
	<TD>Gets a list of available manufacturers or drivers</TD>
</TR>
<TR>
	<TD>CUPS-Get-Printers</TD>
	<TD>Gets a list of printers and/or classes</TD>
</TR>
<TR>
	<TD>CUPS-Move-Job</TD>
	<TD>Moves a job to a new destination</TD>
</TR>
<TR>
	<TD>CUPS-Reject-Jobs</TD>
	<TD>Sets the printer-is-accepting-jobs value for a printer to false</TD>
</TR>
<TR>
	<TD>CUPS-Set-Default</TD>
	<TD>Sets the network/server default printer or class</TD>
</TR>
<TR>
	<TD>Disable-Printer</TD>
	<TD>Sets the printer-state value for a printer to stopped</TD>
</TR>
<TR>
	<TD>Enable-Printer</TD>
	<TD>Sets the printer-state value for a printer to idle/processing</TD>
</TR>
<TR>
	<TD>Get-Job-Attributes</TD>
	<TD>Gets information about a job</TD>
</TR>
<TR>
	<TD>Get-Jobs</TD>
	<TD>Gets a list of jobs</TD>
</TR>
<TR>
	<TD>Get-Notifications</TD>
	<TD>Gets a list of events</TD>
</TR>
<TR>
	<TD>Get-Printer-Attributes</TD>
	<TD>Gets information about a printer or class</TD>
</TR>
<TR>
	<TD>Get-Subscription-Attributes</TD>
	<TD>Gets information about a notification subscription</TD>
</TR>
<TR>
	<TD>Get-Subscriptions</TD>
	<TD>Gets a list of notification subscriptions</TD>
</TR>
<TR>
	<TD>Hold-Job</TD>
	<TD>Holds a job for printing</TD>
</TR>
<TR>
	<TD>Pause-Printer</TD>
	<TD>Sets the printer-state value for a printer to stopped</TD>
</TR>
<TR>
	<TD>Print-Job</TD>
	<TD>Creates a job with a single file for printing</TD>
</TR>
<TR>
	<TD>Purge-Jobs</TD>
	<TD>Removes all jobs from a printer</TD>
</TR>
<TR>
	<TD>Release-Job</TD>
	<TD>Releases a previously held job for printing</TD>
</TR>
<TR>
	<TD>Renew-Subscription</TD>
	<TD>Renews a notification subscription</TD>
</TR>
<TR>
	<TD>Restart-Job</TD>
	<TD>Reprints a job</TD>
</TR>
<TR>
	<TD>Resume-Printer</TD>
	<TD>Sets the printer-state value for a printer to idle/processing</TD>
</TR>
<TR>
	<TD>Send-Document</TD>
	<TD>Adds a file to an job created with Create-Job</TD>
</TR>
<TR>
	<TD>Set-Job-Attributes</TD>
	<TD>Changes job options</TD>
</TR>
<TR>
	<TD>Validate-Job</TD>
	<TD>Validates job options prior to printing</TD>
</TR>
</TBODY>
</TABLE></DIV>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.7</SPAN><A NAME="LimitExcept">LimitExcept</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  &lt;LimitExcept GET POST&gt;
  ...
  &lt;/LimitExcept&gt;
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>LimitExcept</CODE> directive groups access control
directives for specific types of HTTP requests and must appear
inside a <A HREF="#Location"><CODE>Location</CODE></A> section.
Unlike the <A HREF="#Limit"><CODE>Limit</CODE></A> directive,
<CODE>LimitExcept</CODE> restricts access for all requests
<I>except</I> those listed on the <CODE>LimitExcept</CODE>
line.</P>


<H2 CLASS="title"><A NAME="LimitRequestBody">LimitRequestBody</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
LimitRequestBody 10485760
LimitRequestBody 10m
LimitRequestBody 0
</PRE>

<H3>Description</H3>

<P>The <CODE>LimitRequestBody</CODE> directive controls the
maximum size of print files, IPP requests, and HTML form data in
HTTP POST requests. The default limit is 0 which disables the
limit check.</P>


<H2 CLASS="title"><A NAME="Listen">Listen</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
Listen 127.0.0.1:631
Listen 192.0.2.1:631
Listen [::1]:631
Listen *:631
</PRE>

<H3>Description</H3>

<P>The <CODE>Listen</CODE> directive specifies a network address
and port to listen for connections. Multiple <CODE>Listen</CODE>
directives can be provided to listen on multiple addresses.</P>

<P>The <CODE>Listen</CODE> directive is similar to the <A
HREF="#Port"><CODE>Port</CODE></A> directive but allows you to
restrict access to specific interfaces or networks.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.7</SPAN><A NAME="ListenBackLog">ListenBackLog</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
ListenBackLog 5
ListenBackLog 10
</PRE>

<H3>Description</H3>

<P>The <CODE>ListenBackLog</CODE> directive sets the maximum
number of pending connections the scheduler will allow. This
normally only affects very busy servers that have reached the <A
HREF="#MaxClients"><CODE>MaxClients</CODE></A> limit, but can
also be triggered by large numbers of simultaneous connections.
When the limit is reached, the operating system will refuse
additional connections until the scheduler can accept the pending
ones. The default is the OS-defined default limit, typically
either 5 for older operating systems or 128 for newer operating
systems.</P>


<H2 CLASS="title"><A NAME="Location">Location</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /&gt;
...
&lt;/Location&gt;

&lt;Location /admin&gt;
...
&lt;/Location&gt;

&lt;Location /admin/conf&gt;
...
&lt;/Location&gt;

&lt;Location /admin/log&gt;
...
&lt;/Location&gt;

&lt;Location /classes&gt;
...
&lt;/Location&gt;

&lt;Location /classes/name&gt;
...
&lt;/Location&gt;

&lt;Location /jobs&gt;
...
&lt;/Location&gt;

&lt;Location /printers&gt;
...
&lt;/Location&gt;

&lt;Location /printers/name&gt;
...
&lt;/Location&gt;

</PRE>

<H3>Description</H3>

<P>The <CODE>Location</CODE> directive specifies access control
and authentication options for the specified HTTP resource or
path.  The  <A HREF="#Allow"><CODE>Allow</CODE></A>,  <A
HREF="#AuthType"><CODE>AuthType</CODE></A>,  <A
HREF="#Deny"><CODE>Deny</CODE></A>,  <A
HREF="#Encryption"><CODE>Encryption</CODE></A>,  <A
HREF="#Limit"><CODE>Limit</CODE></A>,  <A
HREF="#LimitExcept"><CODE>LimitExcept</CODE></A>,  <A
HREF="#Order"><CODE>Order</CODE></A>,  <A
HREF="#Require"><CODE>Require</CODE></A>, and <A
HREF="#Satisfy"><CODE>Satisfy</CODE></A> directives may all
appear inside a location.</P>

<P>Note that more specific resources override the less specific
ones. So the directives inside the <CODE>/printers/name</CODE>
location will override ones from <CODE>/printers</CODE>.
Directives inside <CODE>/printers</CODE> will override ones from
<CODE>/</CODE>. None of the directives are inherited.</P>

<DIV CLASS="table"><TABLE SUMMARY="Common Locations on the Server">
<CAPTION>Table 3: <A NAME="TABLE3">Common Locations on the Server</A></CAPTION>
<THEAD>
<TR><TH>Location</TH><TH>Description</TH></TR>
</THEAD>
<TBODY>
<TR><TD><CODE>/</CODE></TD><TD>The path for all get operations (get-printers, get-jobs, etc.)</TD></TR>
<TR><TD><CODE>/admin</CODE></TD><TD>The path for all administration operations (add-printer, delete-printer, start-printer, etc.)</TD></TR>
<TR><TD><CODE>/admin/conf</CODE></TD><TD>The path for access to the CUPS configuration files (cupsd.conf, client.conf, etc.)</TD></TR>
<TR><TD><CODE>/admin/log</CODE></TD><TD>The path for access to the CUPS log files (access_log, error_log, page_log)</TD></TR>
<TR><TD><CODE>/classes</CODE></TD><TD>The path for all classes</TD></TR>
<TR><TD><CODE>/classes/name</CODE></TD><TD>The resource for class <CODE>name</CODE></TD></TR>
<TR><TD><CODE>/jobs</CODE></TD><TD>The path for all jobs (hold-job, release-job, etc.)</TD></TR>
<TR><TD><CODE>/jobs/id</CODE></TD><TD>The resource for job <CODE>id</CODE></TD></TR>
<TR><TD><CODE>/printers</CODE></TD><TD>The path for all printers</TD></TR>
<TR><TD><CODE>/printers/name</CODE></TD><TD>The path for printer <CODE>name</CODE></TD></TR>
<TR><TD><CODE>/printers/name.ppd</CODE></TD><TD>The PPD file path for printer <CODE>name</CODE></TD></TR>
</TBODY>
</TABLE></DIV>


<H2 CLASS="title"><A NAME="LogDebugHistory">LogDebugHistory</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
LogDebugHistory 0
LogDebugHistory 200
</PRE>

<H3>Description</H3>

<P>When <A HREF="#LogLevel"><CODE>LogLevel</CODE></A> is not set to
<CODE>debug</CODE> or <CODE>debug2</CODE>, the <CODE>LogDebugHistory</CODE>
directive specifies the number of debugging messages that are logged when an
error occurs during printing. The default is 200 messages. A value of 0
disables debugging history entirely and is not recommended.</P>


<H2 CLASS="title"><A NAME="LogLevel">LogLevel</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
LogLevel none
LogLevel emerg
LogLevel alert
LogLevel crit
LogLevel error
LogLevel warn
LogLevel notice
LogLevel info
LogLevel debug
LogLevel debug2
</PRE>

<H3>Description</H3>

<P>The <CODE>LogLevel</CODE> directive specifies the level of
logging for the <A HREF="ref-cups-files-conf.html#ErrorLog"><CODE>ErrorLog</CODE></A>
file. The following values are recognized (each level logs
everything under the preceding levels):</P>

<UL>

	<LI><CODE>none</CODE> - Log nothing</LI>

	<LI><CODE>emerg</CODE> - Log emergency conditions that
	prevent the server from running</LI>

	<LI><CODE>alert</CODE> - Log alerts that must be handled
	immediately</LI>

	<LI><CODE>crit</CODE> - Log critical errors that don't
	prevent the server from running</LI>

	<LI><CODE>error</CODE> - Log general errors</LI>

	<LI><CODE>warn</CODE> - Log errors and warnings</LI>

	<LI><CODE>notice</CODE> - Log temporary error conditions</LI>

	<LI><CODE>info</CODE> - Log all requests and state
	changes</LI>

	<LI><CODE>debug</CODE> - Log basic debugging
	information</LI>

	<LI><CODE>debug2</CODE> - Log all debugging
	information</LI>

</UL>

<p>The default <code>LogLevel</code> is <code>@CUPS_LOG_LEVEL@</code>.</p>


<H2 CLASS="title"><A NAME="LogTimeFormat">LogTimeFormat</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
LogTimeFormat standard
LogTimeFormat usecs
</PRE>

<H3>Description</H3>

<P>The <CODE>LogTimeFormat</CODE> directive specifies the format used for the
date and time in the log files. <CODE>Standard</CODE> uses the standard Apache
Common Log Format date and time while <CODE>usecs</CODE> adds microseconds.
The default is <CODE>standard</CODE>.</P>


<H2 CLASS="title"><A NAME="MaxClients">MaxClients</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxClients 100
MaxClients 1024
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxClients</CODE> directive controls the maximum
number of simultaneous clients that will be allowed by the
server. The default is 100 clients.</P>

<BLOCKQUOTE><B>Note:</B>

<P>Since each print job requires a file descriptor for the status
pipe, the scheduler internally limits the <CODE>MaxClients</CODE>
value to 1/3 of the available file descriptors to avoid possible
problems when printing large numbers of jobs.</P>

</BLOCKQUOTE>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.18</SPAN><A NAME="MaxClientsPerHost">MaxClientsPerHost</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxClientsPerHost 10
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxClientsPerHost</CODE> directive controls the
maximum number of simultaneous clients that will be allowed from
a single host by the server. The default is the
<CODE>MaxClients</CODE> value.</P>

<P>This directive provides a small measure of protection against
Denial of Service attacks from a single host.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.16</SPAN><A NAME="MaxCopies">MaxCopies</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxCopies 100
MaxCopies 65535
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxCopies</CODE> directive controls the maximum
number of copies that a user can print of a job. The default is
@CUPS_MAX_COPIES@ copies.</P>

<BLOCKQUOTE><B>Note:</B>

<P>Most HP PCL laser printers internally limit the number of
copies to 100.</P>

</BLOCKQUOTE>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.6/OS X 10.8</SPAN><A NAME="MaxHoldTime">MaxHoldTime</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxHoldTime 10800
MaxHoldTime 3h
MaxHoldTime 180m
MaxHoldTime 0
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxHoldTime</CODE> directive controls the maximum number of seconds allowed for a job to remain in the "indefinite" hold state. The job is canceled automatically if it remains held indefinitely longer than the specified time interval in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix).</P>

<p>The default setting is <CODE>0</CODE> which disables this functionality.</P>


<H2 CLASS="title"><A NAME="MaxJobs">MaxJobs</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxJobs 100
MaxJobs 9999
MaxJobs 0
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxJobs</CODE> directive controls the maximum number
of jobs that are kept in memory. Once the number of jobs reaches
the limit, the oldest completed job is automatically purged from
the system to make room for the new one. If all of the known jobs
are still pending or active then the new job will be
rejected.</P>

<P>Setting the maximum size to 0 disables this functionality. The
default setting is 500.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.7</SPAN><A NAME="MaxJobsPerPrinter">MaxJobsPerPrinter</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxJobsPerPrinter 100
MaxJobsPerPrinter 9999
MaxJobsPerPrinter 0
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxJobsPerPrinter</CODE> directive controls the
maximum number of active jobs that are allowed for each printer
or class. Once a printer or class reaches the limit, new jobs
will be rejected until one of the active jobs is completed,
stopped, aborted, or canceled.</P>

<P>Setting the maximum to 0 disables this functionality. The
default setting is 0.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.7</SPAN><A NAME="MaxJobsPerUser">MaxJobsPerUser</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxJobsPerUser 100
MaxJobsPerUser 9999
MaxJobsPerUser 0
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxJobsPerUser</CODE> directive controls the maximum
number of active jobs that are allowed for each user. Once a user
reaches the limit, new jobs will be rejected until one of the
active jobs is completed, stopped, aborted, or canceled.</P>

<P>Setting the maximum to 0 disables this functionality. The
default setting is 0.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.6/OS X 10.8</SPAN><A NAME="MaxJobTime">MaxJobTime</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxJobTime 10800
MaxJobTime 3h
MaxJobTime 180m
MaxJobTime 0
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxJobTime</CODE> directive controls the maximum number of
seconds allowed for a job to complete printing before it is considered "stuck".
The job is canceled automatically if it takes longer than the specified time to complete in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix).</P>

<p>Setting the maximum time to <CODE>0</CODE> disables this functionality. The default setting is <CODE>3h</CODE> (3 hours).</P>


<H2 CLASS="title"><A NAME="MaxLogSize">MaxLogSize</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxLogSize 1048576
MaxLogSize 1m
MaxLogSize 0
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxLogSize</CODE> directive controls the maximum
size of each log file. Once a log file reaches or exceeds the
maximum size it is closed and renamed to <VAR>filename.O</VAR>.
This allows you to rotate the logs automatically. The default
size is 1048576 bytes (1MB).</P>

<P>Setting the maximum size to 0 disables log rotation.</P>


<H2 CLASS="title"><SPAN CLASS="info">Deprecated</SPAN><A NAME="MaxRequestSize">MaxRequestSize</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MaxRequestSize 10485760
MaxRequestSize 10m
MaxRequestSize 0
</PRE>

<H3>Description</H3>

<P>The <CODE>MaxRequestSize</CODE> directive controls the maximum
size of print files, IPP requests, and HTML form data in HTTP
POST requests. The default limit is 0 which disables the limit
check.</P>

<P><B>This directive is deprecated and will be removed in a
future CUPS release.</B> Use the <A
HREF="#LimitRequestBody"><CODE>LimitRequestBody</CODE></A>
directive instead.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.4/OS X 10.6</SPAN><A NAME="MultipleOperationTimeout">MultipleOperationTimeout</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
MultipleOperationTimeout 1w
MultipleOperationTimeout 1d
MultipleOperationTimeout 1h
MultipleOperationTimeout 5m
MultipleOperationTimeout 300
</PRE>

<H3>Description</H3>

<P>The <CODE>MultipleOperationTimeout</CODE> directive sets the maximum amount of time between files in a multi-file print job in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix).</P>

<P>The default is <CODE>5m</CODE> (five minutes).</P>


<H2 CLASS="title"><A NAME="Order">Order</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  ...
  Order Allow,Deny
  Order Deny,Allow
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>Order</CODE> directive defines the default access
control. The following values are supported:</P>

<UL>

	<LI><CODE>allow,deny</CODE> - Deny requests by default,
	then check the <A HREF="#Allow"><CODE>Allow</CODE></A>
	lines followed by the <A
	HREF="#Deny"><CODE>Deny</CODE></A> lines</LI>

	<LI><CODE>deny,allow</CODE> - Allow requests by default,
	then check the <A HREF="#Deny"><CODE>Deny</CODE></A>
	lines followed by the <A
	HREF="#Allow"><CODE>Allow</CODE></A> lines</LI>

</UL>

<P>The <CODE>Order</CODE> directive must appear inside a <A
HREF="#Location"><CODE>Location</CODE></A> or <A
HREF="#Limit"><CODE>Limit</CODE></A> section.</P>


<H2 CLASS="title"><A NAME="PageLogFormat">PageLogFormat</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
PageLogFormat %p %u %j %T %P %C %{job-billing} %{job-originating-host-name} %{job-name} %{media} %{sides}
PageLogFormat PAGE %p %u %j %P %C %{job-billing} %{job-originating-host-name}
</PRE>

<H3>Description</H3>

<P>The <CODE>PageLogFormat</CODE> directive sets the format of lines
that are logged to the page log file. Sequences beginning with percent (%)
characters are replaced with the corresponding information, while all other
characters are copied literally. The following percent sequences are
recognized:</P>

<UL>

	<LI><CODE>%%</CODE>: Inserts a single percent character.</LI>

	<LI><CODE>%{name}</CODE>: Inserts the value of the specified IPP
	attribute.</LI>

	<LI><CODE>%C</CODE>: Inserts the number of copies for the current page.</LI>

	<LI><CODE>%P</CODE>: Inserts the current page number.</LI>

	<LI><CODE>%T</CODE>: Inserts the current date and time in common log
	format.</LI>

	<LI><CODE>%j</CODE>: Inserts the job ID.</LI>

	<LI><CODE>%p</CODE>: Inserts the printer name.</LI>

	<LI><CODE>%u</CODE>: Inserts the username.</LI>

</UL>

<P>The default is "%p %u %j %T %P %C %{job-billing} %{job-originating-host-name} %{job-name} %{media} %{sides}".</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="PassEnv">PassEnv</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
PassEnv MY_ENV_VARIABLE
</PRE>

<H3>Description</H3>

<P>The <CODE>PassEnv</CODE> directive specifies an environment
variable that should be passed to child processes. Normally, the
scheduler only passes the <CODE>DYLD_LIBRARY_PATH</CODE>,
<CODE>LD_ASSUME_KERNEL</CODE>, <CODE>LD_LIBRARY_PATH</CODE>,
<CODE>LD_PRELOAD</CODE>, <CODE>NLSPATH</CODE>,
<CODE>SHLIB_PATH</CODE>, <CODE>TZ</CODE>, and <CODE>VGARGS</CODE>
environment variables to child processes.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="Policy">Policy</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Policy name&gt;
  &lt;Limit operation ... operation&gt;
  ...
  &lt;/Limit&gt;
  &lt;Limit operation ... operation&gt;
  ...
  &lt;/Limit&gt;
  &lt;Limit All&gt;
  ...
  &lt;/Limit&gt;
&lt;/Policy&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>Policy</CODE> directive specifies IPP operation
access control limits. Each policy contains 1 or more <A
HREF="#LimitIPP"><CODE>Limit</CODE></A> sections to set the
access control limits for specific operations - user limits,
authentication, encryption, and allowed/denied addresses,
domains, or hosts. The <CODE>&lt;Limit All&gt;</CODE> section
specifies the default access control limits for operations that
are not listed.</P>

<P>Policies are named and associated with printers via the
printer's operation policy setting
(<CODE>printer-op-policy</CODE>). The default policy for the
scheduler is specified using the <A
HREF="#DefaultPolicy"><CODE>DefaultPolicy</CODE></A>
directive.</P>


<H2 CLASS="title"><A NAME="Port">Port</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
Port 631
Port 80
</PRE>

<H3>Description</H3>

<P>The <CODE>Port</CODE> directive specifies a port to listen on.
Multiple <CODE>Port</CODE> lines can be specified to listen on
multiple ports. The <CODE>Port</CODE> directive is equivalent to
"<CODE>Listen *:nnn</CODE>". The default port is 631.</P>

<BLOCKQUOTE><B>Note:</B>

<P>On systems that support IPv6, this directive will bind to both
the IPv4 and IPv6 wildcard address.</P>

</BLOCKQUOTE>


<H2 CLASS="title"><A NAME="PreserveJobHistory">PreserveJobHistory</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
PreserveJobHistory On
PreserveJobHistory Off
PreserveJobHistory 1w
PreserveJobHistory 7d
PreserveJobHistory 168h
PreserveJobHistory 10080m
PreserveJobHistory 604800
</PRE>

<H3>Description</H3>

<P>The <CODE>PreserveJobHistory</CODE> directive controls whether the history of completed, canceled, or aborted print jobs is retained by the scheduler. A value of <CODE>On</CODE> preserves job information until the administrator purges it with the <CODE>cancel</CODE> command. A value of <CODE>Off</CODE> removes the job information as soon as each job is completed, canceled, or aborted. Numeric values preserve job information for the specified number of seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix).</P>

<P>The default value is <CODE>On</CODE>.</P>

<BLOCKQUOTE><B>Note:</B>

<P>The <A HREF="#MaxJobs"><CODE>MaxJobs</CODE></A>, <A HREF="#MaxJobsPerPrinter"><CODE>MaxJobsPerPrinter</CODE></A>, and <A HREF="#MaxJobsPerUser"><CODE>MaxJobsPerUser</CODE></A> directives can cause job history to be discarded to make room for new jobs.</P>

</BLOCKQUOTE>


<H2 CLASS="title"><A NAME="PreserveJobFiles">PreserveJobFiles</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
PreserveJobFiles On
PreserveJobFiles Off
PreserveJobFiles 1w
PreserveJobFiles 7d
PreserveJobFiles 168h
PreserveJobFiles 10080m
PreserveJobFiles 604800
</PRE>

<H3>Description</H3>

<P>The <CODE>PreserveJobFiles</CODE> directive controls whether the document files of completed, canceled, or aborted print jobs are retained. Jobs can be restarted (and reprinted) as desired until they are purged.</P>

<P>A value of <CODE>On</CODE> preserves job files until the administrator purges them with the <CODE>cancel</CODE> command. A value of <CODE>Off</CODE> removes the job files as soon as each job is completed, canceled, or aborted. Numeric values preserve job files for the specified number of seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix).</P>

<P>The default value is <CODE>1d</CODE> (one day).</P>

<BLOCKQUOTE><B>Note:</B>

<P>The <A HREF="#MaxJobs"><CODE>MaxJobs</CODE></A>, <A HREF="#MaxJobsPerPrinter"><CODE>MaxJobsPerPrinter</CODE></A>, <A HREF="#MaxJobsPerUser"><CODE>MaxJobsPerUser</CODE></A>, and <A HREF="#PreserveJobHistory"><CODE>PreserveJobHistory</CODE></A> directives can cause job files to be discarded sooner than specified.</P>

</BLOCKQUOTE>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.21</SPAN><A NAME="ReloadTimeout">ReloadTimeout</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
ReloadTimeout 0
ReloadTimeout 30
</PRE>

<H3>Description</H3>

<P>The <CODE>ReloadTimeout</CODE> directive specifies the number
of seconds the scheduler will wait for active jobs to complete
before doing a restart. The default is 30 seconds.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.7</SPAN><A NAME="Require">Require</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  ...
  Require group foo bar
  Require user john mary
  Require valid-user
  Require user @groupname
  Require user @SYSTEM
  Require user @OWNER
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>Require</CODE> directive specifies that
authentication is required for the resource. The
<CODE>group</CODE> keyword specifies that the authenticated user
must be a member of one or more of the named groups that
follow.</P>

<P>The <CODE>user</CODE> keyword specifies that the
authenticated user must be one of the named users or groups that
follow. Group names are specified using the "@" prefix.</P>

<P>The <CODE>valid-user</CODE> keyword specifies that any
authenticated user may access the resource.</P>

<P>The default is to do no authentication. This directive must
appear inside a <A HREF="#Location"><CODE>Location</CODE></A> or
<A HREF="#Limit"><CODE>Limit</CODE></A> section.</P>


<H2 CLASS="title"><A NAME="RIPCache">RIPCache</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
RIPCache 128m
RIPCache 1g
RIPCache 2048k
</PRE>

<H3>Description</H3>

<P>The <CODE>RIPCache</CODE> directive sets the size of the
memory cache used by Raster Image Processor ("RIP") filters such
as <CODE>imagetoraster</CODE> and <CODE>pstoraster</CODE>. The
size can be suffixed with a "k" for kilobytes, "m" for megabytes,
or "g" for gigabytes. The default cache size is "128m", or 128
megabytes.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.16</SPAN><A NAME="RootCertDuration">RootCertDuration</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
RootCertDuration 0
RootCertDuration 1w
RootCertDuration 1d
RootCertDuration 1h
RootCertDuration 5m
RootCertDuration 300
</PRE>

<H3>Description</H3>

<P>The <CODE>RootCertDuration</CODE> directive specifies the amount of time the <EM>root certificate</EM> remains valid in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix). The scheduler will generate a new certificate as needed when the given time interval has expired. If set to 0, the root certificate is generated only once on startup or on a restart.</P>

<P>The default is <CODE>5m</CODE> (five minutes).</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.7</SPAN><A NAME="Satisfy">Satisfy</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
&lt;Location /path&gt;
  ...
  Satisfy all
  Satisfy any
&lt;/Location&gt;
</PRE>

<H3>Description</H3>

<P>The <CODE>Satisfy</CODE> directive specifies whether all
conditions must be satisfied to allow access to the resource. If
set to <CODE>all</CODE>, then all authentication and access
control conditions must be satisfied to allow access.</P>

<P>Setting <CODE>Satisfy</CODE> to <CODE>any</CODE> allows a user
to gain access if the authentication or access control
requirements are satisfied. For example, you might require
authentication for remote access, but allow local access without
authentication.</P>

<P>The default is <CODE>all</CODE>. This directive must appear
inside a <A HREF="#Location"><CODE>Location</CODE></A> or <A
HREF="#Limit"><CODE>Limit</CODE></A> section.</P>


<H2 CLASS="title"><A NAME="ServerAdmin">ServerAdmin</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
ServerAdmin user@host
ServerAdmin root@foo.bar.com
</PRE>

<H3>Description</H3>

<P>The <CODE>ServerAdmin</CODE> directive identifies the email
address for the administrator on the system. By default the
administrator email address is <CODE>root@server</CODE>, where
<CODE>server</CODE> is the <A
HREF="#ServerName"><CODE>ServerName</CODE></A>.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.3.10</SPAN><A NAME="ServerAlias">ServerAlias</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
ServerAlias althost
ServerAlias foo.example.com
ServerAlias bar.example.com
ServerAlias one.example.com two.example.com
ServerAlias *
</PRE>

<H3>Description</H3>

<P>The <CODE>ServerAlias</CODE> directive specifies alternate names that the server is known by. By default it contains a list of all aliases associated with the <A HREF="#ServerName"><CODE>ServerName</CODE></A>. The special name "*" can be used to allow any hostname when accessing CUPS via an external network interfaces.</P>

<BLOCKQUOTE><B>Note</B>

<P>The <CODE>ServerAlias</CODE> directive is used for HTTP Host header
validation when clients connect to the scheduler from external interfaces.
Using the special name "*" can expose your system to known browser-based
DNS rebinding attacks, even when accessing sites through a firewall. If the
auto-discovery of alternate names does not work, we recommend listing each
alternate name with a ServerAlias directive instead of using "*".</P>

</BLOCKQUOTE>


<H2 CLASS="title"><A NAME="ServerName">ServerName</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
ServerName foo.example.com
ServerName myserver.example.com
</PRE>

<H3>Description</H3>

<P>The <CODE>ServerName</CODE> directive specifies the hostname
that is reported to clients. By default the server name is the
hostname.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.1.21</SPAN><A NAME="ServerTokens">ServerTokens</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
ServerTokens None
ServerTokens ProductOnly
ServerTokens Major
ServerTokens Minor
ServerTokens Minimal
ServerTokens OS
ServerTokens Full
</PRE>

<H3>Description</H3>

<P>The <CODE>ServerTokens</CODE> directive specifies the
information that is included in the <CODE>Server:</CODE> header
of all HTTP responses. Table 4 lists the token name along with
the text that is returned. The default is
<CODE>Minimal</CODE>.</P>

<DIV CLASS="table"><TABLE SUMMARY="ServerToken Names and Values">
<CAPTION>Table 4: <A NAME="TABLE4">ServerToken Names and Values</A></CAPTION>
<THEAD>
<TR>
	<TH>Name</TH>
	<TH>Value</TH>
</TR>
</THEAD>
<TBODY>
<TR>
	<TD>None</TD>
	<TD>No <CODE>Server:</CODE> header is returned</TD>
</TR>
<TR>
	<TD>ProductOnly</TD>
	<TD>"CUPS"</TD>
</TR>
<TR>
	<TD>Major</TD>
	<TD>"CUPS 1"</TD>
</TR>
<TR>
	<TD>Minor</TD>
	<TD>"CUPS 1.2"</TD>
</TR>
<TR>
	<TD>Minimal</TD>
	<TD>"CUPS 1.2.N" where N is the patch release</TD>
</TR>
<TR>
	<TD>OS</TD>
	<TD>"CUPS 1.2.N (UNAME)" where N is the patch release and
	UNAME is the output of the <B>uname(1)</B> command</TD>
</TR>
<TR>
	<TD>Full</TD>
	<TD>"CUPS 1.2.N (UNAME) IPP/1.1" where N is the patch
	release and UNAME is the output of the <B>uname(1)</B>
	command</TD>
</TR>
</TBODY>
</TABLE></DIV>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.2/OS X 10.5</SPAN><A NAME="SetEnv">SetEnv</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
SetEnv PATH /usr/lib/cups/filter:/bin:/usr/bin:/usr/local/bin
SetEnv MY_ENV_VAR foo
</PRE>

<H3>Description</H3>

<P>The <CODE>SetEnv</CODE> directive specifies an environment
variable that should be passed to child processes.</P>


<H2 CLASS="title"><A NAME="SSLListen">SSLListen</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
SSLListen 127.0.0.1:443
SSLListen 192.0.2.1:443
</PRE>

<H3>Description</H3>

<P>The <CODE>SSLListen</CODE> directive specifies a network
address and port to listen for secure connections. Multiple
<CODE>SSLListen</CODE> directives can be provided to listen on
multiple addresses.</P>

<P>The <CODE>SSLListen</CODE> directive is similar to the <A
HREF="#SSLPort"><CODE>SSLPort</CODE></A> directive but allows you
to restrict access to specific interfaces or networks.</P>


<H2 CLASS="title"><A NAME="SSLOptions">SSLOptions</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
SSLOptions None
SSLOptions NoEmptyFragments
</PRE>

<H3>Description</H3>

<P>The <CODE>SSLOptions</CODE> directive specifies additional SSL/TLS
protocol options to use for encrypted connected. Currently only two
options are supported - <code>None</code> (the default) for the most
secure mode and <code>NoEmptyFragments</code> to allow CUPS to work with
Microsoft Windows with the FIPS conformance mode enabled.</p>


<H2 CLASS="title"><A NAME="SSLPort">SSLPort</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
SSLPort 443
</PRE>

<H3>Description</H3>

<P>The <CODE>SSLPort</CODE> directive specifies a port to listen
on for secure connections. Multiple <CODE>SSLPort</CODE> lines
can be specified to listen on multiple ports.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.6</SPAN><A NAME="StrictConformance">StrictConformance</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
StrictConformance No
StrictConformance Yes
</PRE>

<H3>Description</H3>

<P>The <CODE>StrictConformance</CODE> directive specifies whether the scheduler
requires strict IPP conformance for client requests, for example to not allow
document attributes in a Create-Job request. The default is
<code>No</code>.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.5</SPAN><A NAME="SubscriptionPrivateAccess">SubscriptionPrivateAccess</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
SubscriptionPrivateAccess all
SubscriptionPrivateAccess default
SubscriptionPrivateAccess {user|@group|@ACL|@OWNER|@SYSTEM}+
</PRE>

<H3>Description</H3>

<P>The <CODE>SubscriptionPrivateAccess</CODE> directive specifies the access list for a
subscription's private values. The "default" access list is "@OWNER @SYSTEM".
"@ACL" maps to the printer's requesting-user-name-allowed or
requesting-user-name-denied values.</P>

<P>The <CODE>SubscriptionPrivateAccess</CODE> directive must appear inside a <A
HREF="#Policy"><CODE>Policy</CODE></A> section.</P>


<H2 CLASS="title"><SPAN CLASS="info">CUPS 1.5</SPAN><A NAME="SubscriptionPrivateValues">SubscriptionPrivateValues</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
SubscriptionPrivateValues all
SubscriptionPrivateValues default
SubscriptionPrivateValues none
SubscriptionPrivateValues attribute-name-1 [ ... attribute-name-N ]
</PRE>

<H3>Description</H3>

<P>The <CODE>SubscriptionPrivateValues</CODE> directive specifies the list of
subscription values to make private. The "default" values are "notify-events",
"notify-pull-method", "notify-recipient-uri", "notify-subscriber-user-name", and
"notify-user-data".</P>

<P>The <CODE>SubscriptionPrivateValues</CODE> directive must appear inside a <A
HREF="#Policy"><CODE>Policy</CODE></A> section.</P>


<H2 CLASS="title"><A NAME="Timeout">Timeout</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
Timeout 1w
Timeout 1d
Timeout 1h
Timeout 5m
Timeout 300
</PRE>

<H3>Description</H3>

<P>The <CODE>Timeout</CODE> directive controls the amount of time
to wait before an active HTTP or IPP request times out in seconds (no suffix), minutes ("m" suffix), hours ("h" suffix), days ("d" suffix), or weeks ("w" suffix).</P>

<P>The default timeout is <CODE>5m</CODE> (five minutes).</P>


<H2 CLASS="title"><SPAN CLASS="INFO">CUPS 1.5</SPAN><A NAME="WebInterface">WebInterface</A></H2>

<H3>Examples</H3>

<PRE CLASS="command">
WebInterface Yes
WebInterface No
</PRE>

<H3>Description</H3>

<P>The <CODE>WebInterface</CODE> directive specifies whether the web interface is enabled. The default value is <CODE>No</CODE> on OS X and <CODE>Yes</CODE> on all other operating systems.</P>

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