cupsd.conf(5)
NAME
cupsd.conf - server configuration file for cups
DESCRIPTION
The cupsd.conf file configures the CUPS scheduler, cupsd(8). It is
normally located in the /etc/cups directory. Note: File, directory,
and user configuration directives that used to be allowed in the
cupsd.conf file are now stored in the cups-files.conf(5) file instead
in order to prevent certain types of privilege escalation attacks.
Each line in the file can be a configuration directive, a blank line,
or a comment. Configuration directives typically consist of a name and
zero or more values separated by whitespace. The configuration
directive name and values are case-insensitive. Comment lines start
with the # character.
TOP-LEVEL DIRECTIVES
The following top-level directives are understood by cupsd(8):
AccessLogLevel config
AccessLogLevel actions
AccessLogLevel all
Specifies the logging level for the AccessLog file. The "config"
level logs when printers and classes are added, deleted, or
modified and when configuration files are accessed or updated.
The "actions" level logs when print jobs are submitted, held,
released, modified, or canceled, and any of the conditions for
"config". The "all" level logs all requests. The default access
log level is "actions".
AutoPurgeJobs Yes
AutoPurgeJobs No
Specifies whether to purge job history data automatically when it
is no longer required for quotas. The default is "No".
BrowseLocalProtocols all
BrowseLocalProtocols dnssd
BrowseLocalProtocols none
Specifies which protocols to use for local printer sharing. The
default is "dnssd" on systems that support Bonjour and "none"
otherwise.
BrowseWebIF Yes
BrowseWebIF No
Specifies whether the CUPS web interface is advertised. The
default is "No".
Browsing Yes
Browsing No
Specifies whether shared printers are advertised. The default is
"No".
Classification banner
Specifies the security classification of the server. Any valid
banner name can be used, including "classified", "confidential",
"secret", "topsecret", and "unclassified", or the banner can be
omitted to disable secure printing functions. The default is no
classification banner.
ClassifyOverride Yes
ClassifyOverride No
Specifies whether users may override the classification (cover
page) of individual print jobs using the "job-sheets" option. The
default is "No".
DefaultAuthType Basic
DefaultAuthType Negotiate
Specifies the default type of authentication to use. The default
is "Basic".
DefaultEncryption Never
DefaultEncryption IfRequested
DefaultEncryption Required
Specifies whether encryption will be used for authenticated
requests. The default is "Required".
DefaultLanguage locale
Specifies the default language to use for text and web content.
The default is "en".
DefaultPaperSize Auto
DefaultPaperSize None
DefaultPaperSize sizename
Specifies the default paper size for new print queues. "Auto" uses
a locale-specific default, while "None" specifies there is no
default paper size. Specific size names are typically "Letter" or
"A4". The default is "Auto".
DefaultPolicy policy-name
Specifies the default access policy to use. The default access
policy is "default".
DefaultShared Yes
DefaultShared No
Specifies whether local printers are shared by default. The
default is "Yes".
DirtyCleanInterval seconds
Specifies the delay for updating of configuration and state files.
A value of 0 causes the update to happen as soon as possible,
typically within a few milliseconds. The default value is "30".
ErrorPolicy abort-job
Specifies that a failed print job should be aborted (discarded)
unless otherwise specified for the printer.
ErrorPolicy retry-job
Specifies that a failed print job should be retried at a later
time unless otherwise specified for the printer. The 'retry-job'
error policy is the default.
ErrorPolicy retry-this-job
Specifies that a failed print job should be retried immediately
unless otherwise specified for the printer.
ErrorPolicy stop-printer
Specifies that a failed print job should stop the printer unless
otherwise specified for the printer.
FilterLimit limit
Specifies the maximum cost of filters that are run concurrently,
which can be used to minimize disk, memory, and CPU resource
problems. A limit of 0 disables filter limiting. 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. The default limit
is "0".
FilterNice nice-value
Specifies the scheduling priority ( nice(8) value) of filters that
are run to print a job. The nice value ranges from 0, the highest
priority, to 19, the lowest priority. The default is 0.
GSSServiceName name
Specifies the service name when using Kerberos authentication.
The default service name is "http."
HostNameLookups On
HostNameLookups Off
HostNameLookups Double
Specifies whether to do reverse lookups on connecting clients.
The "Double" setting causes cupsd(8) to verify that the hostname
resolved from the address matches one of the addresses returned
for that hostname. Double lookups also prevent clients with
unregistered addresses from connecting to your server. The
default is "Off" to avoid the potential server performance
problems with hostname lookups. Only set this option to "On" or
"Double" if absolutely required.
IdleExitTimeout seconds
Specifies the length of time to wait before shutting down due to
inactivity. The default is "60" seconds. Note: Only applicable
when cupsd(8) is run on-demand (e.g., with -l).
JobKillDelay seconds
Specifies the number of seconds to wait before killing the filters
and backend associated with a canceled or held job. The default
is "30".
JobRetryInterval seconds
Specifies the interval between retries of jobs in seconds. This
is typically used for fax queues but can also be used with normal
print queues whose error policy is "retry-job" or "retry-current-
job". The default is "30".
JobRetryLimit count
Specifies the number of retries that are done for jobs. This is
typically used for fax queues but can also be used with normal
print queues whose error policy is "retry-job" or "retry-current-
job". The default is "5".
KeepAlive Yes
KeepAlive No
Specifies whether to support HTTP keep-alive connections. The
default is "Yes".
KeepAliveTimeout seconds
Specifies how long an idle client connection remains open. The
default is "30".
<Limit operation ...> ... </Limit>
Specifies the IPP operations that are being limited inside a
Policy section. IPP operation names are listed below in the
section "IPP OPERATION NAMES".
<Limit method ...> ... </Limit>
<LimitExcept method ...> ... </LimitExcept>
Specifies the HTTP methods that are being limited inside a
Location section. HTTP method names are listed below in the
section "HTTP METHOD NAMES".
LimitRequestBody size
Specifies the maximum size of print files, IPP requests, and HTML
form data. The default is "0" which disables the limit check.
Listen ipv4-address:port
Listen [ipv6-address]:port
Listen *:port
Listen /path/to/domain/socket
Listens to the specified address and port or domain socket path
for connections. Multiple Listen directives can be provided to
listen on multiple addresses. The Listen directive is similar to
the Port directive but allows you to restrict access to specific
interfaces or networks.
ListenBackLog number
Specifies the number of pending connections that will be allowed.
This normally only affects very busy servers that have reached the
MaxClients 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.
<Location /path> ... </Location>
Specifies access control for the named location. Paths are
documented below in the section "LOCATION PATHS".
LogDebugHistory number
Specifies the number of debugging messages that are retained for
logging if an error occurs in a print job. Debug messages are
logged regardless of the LogLevel setting.
LogLevel none
LogLevel emerg
LogLevel alert
LogLevel crit
LogLevel error
LogLevel warn
LogLevel notice
LogLevel info
LogLevel debug
LogLevel debug2
Specifies the level of logging for the ErrorLog file. The value
"none" stops all logging while "debug2" logs everything. The
default is "warn".
LogTimeFormat standard
LogTimeFormat usecs
Specifies the format of the date and time in the log files. The
value "standard" is the default and logs whole seconds while
"usecs" logs microseconds.
MaxClients number
Specifies the maximum number of simultaneous clients that are
allowed by the scheduler. The default is "100".
MaxClientsPerHost number
Specifies the maximum number of simultaneous clients that are
allowed from a single address. The default is the MaxClients
value.
MaxCopies number
Specifies the maximum number of copies that a user can print of
each job. The default is "9999".
MaxHoldTime seconds
Specifies the maximum time a job may remain in the "indefinite"
hold state before it is canceled. The default is "0" which
disables cancellation of held jobs.
MaxJobs number
Specifies the maximum number of simultaneous jobs that are
allowed. Set to "0" to allow an unlimited number of jobs. The
default is "500".
MaxJobsPerPrinter number
Specifies the maximum number of simultaneous jobs that are allowed
per printer. The default is "0" which allows up to MaxJobs jobs
per printer.
MaxJobsPerUser number
Specifies the maximum number of simultaneous jobs that are allowed
per user. The default is "0" which allows up to MaxJobs jobs per
user.
MaxJobTime seconds
Specifies the maximum time a job may take to print before it is
canceled. Set to "0" to disable cancellation of "stuck" jobs.
The default is "10800" (3 hours).
MaxLogSize size
Specifies the maximum size of the log files before they are
rotated. The value "0" disables log rotation. The default is
"1048576" (1MB).
MultipleOperationTimeout seconds
Specifies the maximum amount of time to allow between files in a
multiple file print job. The default is "300" (5 minutes).
PageLogFormat format-string
Specifies the format of PageLog lines. Sequences beginning with
percent (%) characters are replaced with the corresponding
information, while all other characters are copied literally. The
following percent sequences are recognized:
"%%" inserts a single percent character.
"%{name}" inserts the value of the specified IPP attribute.
"%C" inserts the number of copies for the current page.
"%P" inserts the current page number.
"%T" inserts the current date and time in common log format.
"%j" inserts the job ID.
"%p" inserts the printer name.
"%u" inserts the username.
The default is the empty string, which disables page logging. The
string "%p %u %j %T %P %C %{job-billing} %{job-originating-host-
name} %{job-name} %{media} %{sides}" creates a page log with the
standard items.
PassEnv variable [ ... variable ]
Passes the specified environment variable(s) to child processes.
<Policy name> ... </Policy>
Specifies access control for the named policy.
Port number
Listens to the specified port number for connections.
PreserveJobFiles Yes
PreserveJobFiles No
PreserveJobFiles seconds
Specifies whether job files (documents) are preserved after a job
is printed. If a numeric value is specified, job files are
preserved for the indicated number of seconds after printing. The
default is "86400" (preserve 1 day).
PreserveJobHistory Yes
PreserveJobHistory No
PreserveJobHistory seconds
Specifies whether the job history is preserved after a job is
printed. If a numeric value is specified, the job history is
preserved for the indicated number of seconds after printing. If
"Yes", the job history is preserved until the MaxJobs limit is
reached. The default is "Yes".
ReloadTimeout seconds
Specifies the amount of time to wait for job completion before
restarting the scheduler. The default is "30".
RIPCache size
Specifies the maximum amount of memory to use when converting
documents into bitmaps for a printer. The default is "128m".
ServerAdmin email-address
Specifies the email address of the server administrator. The
default value is "root@ServerName".
ServerAlias hostname [ ... hostname ]
ServerAlias *
The ServerAlias 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 "*".
ServerName hostname
Specifies the fully-qualified hostname of the server. The default
is the value reported by the hostname(1) command.
ServerTokens None
ServerTokens ProductOnly
ServerTokens Major
ServerTokens Minor
ServerTokens Minimal
ServerTokens OS
ServerTokens Full
Specifies what information is included in the Server header of
HTTP responses. "None" disables the Server header. "ProductOnly"
reports "CUPS". "Major" reports "CUPS 2". "Minor" reports "CUPS
2.0". "Minimal" reports "CUPS 2.0.0". "OS" reports "CUPS 2.0.0
(UNAME)" where UNAME is the output of the uname(1) command.
"Full" reports "CUPS 2.0.0 (UNAME) IPP/2.0". The default is
"Minimal".
SetEnv variable value
Set the specified environment variable to be passed to child
processes.
SSLListen ipv4-address:port
SSLListen [ipv6-address]:port
SSLListen *:port
Listens on the specified address and port for encrypted
connections.
SSLOptions [AllowRC4] [AllowSSL3]
SSLOptions None
Sets encryption options. By default, CUPS only supports
encryption using TLS v1.0 or higher using known secure cipher
suites. The AllowRC4 option enables the 128-bit RC4 cipher
suites, which are required for some older clients that do not
implement newer ones. The AllowSSL3 option enables SSL v3.0,
which is required for some older clients that do not support TLS
v1.0.
SSLPort port
Listens on the specified port for encrypted connections.
StrictConformance Yes
StrictConformance No
Specifies whether the scheduler requires clients to strictly
adhere to the IPP specifications. The default is "No".
Timeout seconds
Specifies the HTTP request timeout. The default is "300" (5
minutes).
WebInterface yes
WebInterface no
Specifies whether the web interface is enabled. The default is
"No".
HTTP METHOD NAMES
The following HTTP methods are supported by cupsd(8):
GET Used by a client to download icons and other printer resources and
to access the CUPS web interface.
HEAD Used by a client to get the type, size, and modification date of
resources.
OPTIONS
Used by a client to establish a secure (SSL/TLS) connection.
POST Used by a client to submit IPP requests and HTML forms from the
CUPS web interface.
PUT Used by a client to upload configuration files.
IPP OPERATION NAMES
The following IPP operations are supported by cupsd(8):
CUPS-Accept-Jobs
Allows a printer to accept new jobs.
CUPS-Add-Modify-Class
Adds or modifies a printer class.
CUPS-Add-Modify-Printer
Adds or modifies a printer.
CUPS-Authenticate-Job
Releases a job that is held for authentication.
CUPS-Delete-Class
Deletes a printer class.
CUPS-Delete-Printer
Deletes a printer.
CUPS-Get-Classes
Gets a list of printer classes.
CUPS-Get-Default
Gets the server default printer or printer class.
CUPS-Get-Devices
Gets a list of devices that are currently available.
CUPS-Get-Document
Gets a document file for a job.
CUPS-Get-PPD
Gets a PPD file.
CUPS-Get-PPDs
Gets a list of installed PPD files.
CUPS-Get-Printers
Gets a list of printers.
CUPS-Move-Job
Moves a job.
CUPS-Reject-Jobs
Prevents a printer from accepting new jobs.
CUPS-Set-Default
Sets the server default printer or printer class.
Cancel-Job
Cancels a job.
Cancel-Jobs
Cancels one or more jobs.
Cancel-My-Jobs
Cancels one or more jobs creates by a user.
Cancel-Subscription
Cancels a subscription.
Close-Job
Closes a job that is waiting for more documents.
Create-Job
Creates a new job with no documents.
Create-Job-Subscriptions
Creates a subscription for job events.
Create-Printer-Subscriptions
Creates a subscription for printer events.
Get-Job-Attributes
Gets information about a job.
Get-Jobs
Gets a list of jobs.
Get-Notifications
Gets a list of event notifications for a subscription.
Get-Printer-Attributes
Gets information about a printer or printer class.
Get-Subscription-Attributes
Gets information about a subscription.
Get-Subscriptions
Gets a list of subscriptions.
Hold-Job
Holds a job from printing.
Hold-New-Jobs
Holds all new jobs from printing.
Pause-Printer
Stops processing of jobs by a printer or printer class.
Pause-Printer-After-Current-Job
Stops processing of jobs by a printer or printer class after the
current job is finished.
Print-Job
Creates a new job with a single document.
Purge-Jobs
Cancels one or more jobs and deletes the job history.
Release-Held-New-Jobs
Allows previously held jobs to print.
Release-Job
Allows a job to print.
Renew-Subscription
Renews a subscription.
Restart-Job
Reprints a job, if possible.
Send-Document
Adds a document to a job.
Set-Job-Attributes
Changes job information.
Set-Printer-Attributes
Changes printer or printer class information.
Validate-Job
Validates options for a new job.
LOCATION PATHS
The following paths are commonly used when configuring cupsd(8):
/ The path for all get operations (get-printers, get-jobs, etc.)
/admin
The path for all administration operations (add-printer, delete-
printer, start-printer, etc.)
/admin/conf
The path for access to the CUPS configuration files (cupsd.conf,
client.conf, etc.)
/admin/log
The path for access to the CUPS log files (access_log, error_log,
page_log)
/classes
The path for all printer classes
/classes/name
The resource for the named printer class
/jobs
The path for all jobs (hold-job, release-job, etc.)
/jobs/id
The path for the specified job
/printers
The path for all printers
/printers/name
The path for the named printer
/printers/name.png
The icon file path for the named printer
/printers/name.ppd
The PPD file path for the named printer
DIRECTIVES VALID WITHIN LOCATION AND LIMIT SECTIONS
The following directives may be placed inside Location and Limit
sections in the cupsd.conf file:
Allow all
Allow none
Allow host.domain.com
Allow *.domain.com
Allow ipv4-address
Allow ipv4-address/netmask
Allow ipv4-address/mm
Allow [ipv6-address]
Allow [ipv6-address]/mm
Allow @IF(name)
Allow @LOCAL
Allows access from the named hosts, domains, addresses, or
interfaces. The Order directive controls whether Allow lines are
evaluated before or after Deny lines.
AuthType None
AuthType Basic
AuthType Default
AuthType Negotiate
Specifies the type of authentication required. The value
"Default" corresponds to the DefaultAuthType value.
Deny all
Deny none
Deny host.domain.com
Deny *.domain.com
Deny ipv4-address
Deny ipv4-address/netmask
Deny ipv4-address/mm
Deny [ipv6-address]
Deny [ipv6-address]/mm
Deny @IF(name)
Deny @LOCAL
Denies access from the named hosts, domains, addresses, or
interfaces. The Order directive controls whether Deny lines are
evaluated before or after Allow lines.
Encryption IfRequested
Encryption Never
Encryption Required
Specifies the level of encryption that is required for a
particular location. The default value is "IfRequested".
Order allow,deny
Specifies that access is denied by default. Allow lines are then
processed followed by Deny lines to determine whether a client may
access a particular resource.
Order deny,allow
Specifies that access is allowed by default. Deny lines are then
processed followed by Allow lines to determine whether a client
may access a particular resource.
Require group group-name [ group-name ... ]
Specifies that an authenticated user must be a member of one of
the named groups.
Require user {user-name|@group-name} ...
Specifies that an authenticated user must match one of the named
users or be a member of one of the named groups. The group name
"@SYSTEM" corresponds to the list of groups defined by the
SystemGroup directive in the cups-files.conf(5) file. The group
name "@OWNER" corresponds to the owner of the resource, for
example the person that submitted a print job. Note: The 'root'
user is not special and must be granted privileges like any other
user account.
Require valid-user
Specifies that any authenticated user is acceptable.
Satisfy all
Specifies that all Allow, AuthType, Deny, Order, and Require
conditions must be satisfied to allow access.
Satisfy any
Specifies that any a client may access a resource if either the
authentication (AuthType/Require) or address (Allow/Deny/Order)
conditions are satisfied. For example, this can be used to
require authentication only for remote accesses.
DIRECTIVES VALID WITHIN POLICY SECTIONS
The following directives may be placed inside Policy sections in the
cupsd.conf file:
JobPrivateAccess all
JobPrivateAccess default
JobPrivateAccess {user|@group|@ACL|@OWNER|@SYSTEM} ...
Specifies an 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. "@OWNER" maps to the job's owner. "@SYSTEM" maps
to the groups listed for the SystemGroup directive in the cups-
files.conf(5) file.
JobPrivateValues all
JobPrivateValues default
JobPrivateValues none
JobPrivateValues attribute-name [ ... attribute-name ]
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".
SubscriptionPrivateAccess all
SubscriptionPrivateAccess default
SubscriptionPrivateAccess {user|@group|@ACL|@OWNER|@SYSTEM} ...
Specifies an 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. "@OWNER" maps to the job's owner. "@SYSTEM" maps
to the groups listed for the SystemGroup directive in the cups-
files.conf(5) file.
SubscriptionPrivateValues all
SubscriptionPrivateValues default
SubscriptionPrivateValues none
SubscriptionPrivateValues attribute-name [ ... attribute-name ]
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".
CONFORMING TO
The cupsd.conf file format is based on the Apache HTTP Server
configuration file format.
EXAMPLES
Log everything with a maximum log file size of 32 megabytes:
AccessLogLevel all
LogLevel debug2
MaxLogSize 32m
Require authentication for accesses from outside the 10. network:
<Location />
Order allow,deny
Allow from 10./8
AuthType Basic
Require valid-user
Satisfy any
</Location>
SEE ALSO
classes.conf(5), cups-files.conf(5), cupsd(8), mime.convs(5),
mime.types(5), printers.conf(5), subscriptions.conf(5), CUPS Online
Help (http://localhost:631/help)
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