Provided by: squid-openssl_5.7-1ubuntu3_amd64 
NAME
squid - HTTP web proxy caching server
SYNOPSIS
squid [-dhisrvzCFNRSVYX] [--foreground] [-l facility ] [-f config-file ] [-[au] port ] [-k
signal ] [-n service-name ] [-O command-line ]
DESCRIPTION
squid is a high-performance proxy caching server for web clients, supporting FTP, gopher,
ICAP, ICP, HTCP and HTTP data objects. Unlike traditional caching software, Squid handles
all requests in a single, non-blocking process.
Squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups,
supports non-blocking DNS lookups, and implements negative caching of failed requests.
Squid supports SSL, extensive access controls, and full request logging. By using the
lightweight Internet Cache Protocols ICP, HTCP or CARP, Squid caches can be arranged in a
hierarchy or mesh for additional bandwidth savings.
Squid consists of a main server program squid , some optional programs for custom
processing and authentication, and some management and client tools. When squid starts
up, it spawns a configurable number of helper processes, each of which can perform
parallel lookups. This reduces the amount of time the cache waits for results.
Squid is derived from the ARPA-funded Harvest Project.
This manual page only lists the command line arguments. For details on how to configure
Squid see the file /etc/squid/squid.conf.documented, the Squid wiki FAQ and examples at
http://wiki.squid-cache.org/ , or the configuration manual on the Squid home page
http://www.squid-cache.org/Doc/config/
OPTIONS
-a port Specify HTTP port number where Squid should listen for requests, in addition
to any http_port specifications in squid.conf
-C Do not catch fatal signals.
-d level Write debugging to stderr also.
-f file Use the given config-file instead of /etc/squid/squid.conf . If the file name
starts with a ! or | then it is assumed to be an external command or command
line. Can for example be used to pre-process the configuration before it is
being read by Squid. To facilitate this Squid also understands the common
#line notion to indicate the real source file.
-F Don't serve any requests until store is rebuilt.
-h Print help message.
-i Install as a Windows Service (see -n option).
-k reconfigure | rotate | shutdown | interrupt | kill | debug | check | parse
Parse configuration file, then send signal to running copy (except -k parse )
and exit.
-l facility Use specified syslog facility. Implies -s
-n name Specify Windows Service name to use for service operations, default is: Squid
-N No daemon mode.
--foreground
Parent process does not exit until its children have finished. It has no
effect with -N which does not fork/exit at startup.
--kid roleID
Play a given SMP kid process role, with a given ID. Do not use this option. It
is meant for the master process use only.
-O options Set Windows Service Command line options in Registry.
-r Remove a Windows Service (see -n option).
-R Do not set REUSEADDR on port.
-s Enable logging to syslog. Also configurable in /etc/squid/squid.conf
-S Double-check swap during rebuild.
-u port Specify ICP port number (default: 3130), disable with 0.
-v Print version and build details.
-X Force full debugging.
-Y Only return UDP_HIT or UDP_MISS_NOFETCH during fast reload.
-z Create missing swap directories and other missing cache_dir structures, then
exit. All cache_dir types create the configured top-level directory if it is
missing. Other actions are type-specific. For example, ufs-based storage
systems create missing L1 and L2 directories while Rock creates the missing
database file.
This option does not enable validation of any present swap structures. Its
focus is on creation of missing pieces. If nothing is missing, squid -z just
exits. If you suspect cache_dir corruption, you must delete the top-level
cache_dir directory before running squid -z.
By default, squid -z runs in daemon mode (so that configuration macros and
other SMP features work as expected), returning control to the caller before
cache_dirs are fully initialized. If run from init scripts or daemon managers,
the caller often needs to wait for the initialization to complete before
proceeding further. Use --foreground option to prevent premature exits. To
disable daemon mode, use -N option.
FILES
Squid configuration files located in /etc/squid/:
squid.conf
The main configuration file. You must initially make changes to this file for squid
to work. For example, the default configuration only allows access from RFC private
LAN networks. Some packaging distributions block even that.
squid.conf.default
Reference copy of the configuration file. Always kept up to date with the version
of Squid you are using.
Use this to look up the default configuration settings and syntax after upgrading.
squid.conf.documented
Reference copy of the configuration file. Always kept up to date with the version
of Squid you are using.
Use this to read the documentation for configuration options available in your
build of Squid. The online configuration manual is also available for a full
reference of options. seehttp://www.squid-cache.org/Doc/config/
cachemgr.conf
The main configuration file for the web cachemgr.cgi tools.
msntauth.conf
The main configuration file for the Sample MSNT authenticator.
errorpage.css
CSS Stylesheet to control the display of generated error pages. Use this to set
any company branding you need, it will apply to every language Squid provides error
pages for.
Some files also located elsewhere:
/usr/share/squid/mime.conf (mime_table)
MIME type mappings for FTP gatewaying
/usr/share/squid/errors
Location of Squid error pages and templates.
AUTHOR
Squid was written over many years by a changing team of developers and maintained in turn
by Duane Wessels <duane@squid-cache.org> Henrik Nordstrom <hno@squid-cache.org> Amos
Jeffries <amosjeffries@squid-cache.org>
With contributions from many others in the Squid community. see CONTRIBUTORS for a full
list of individuals who contributed code. see CREDITS for a list of major code
contributing copyright holders.
COPYRIGHT
* Copyright (C) 1996-2022 The Squid Software Foundation and contributors
*
* Squid software is distributed under GPLv2+ license and includes
* contributions from numerous individuals and organizations.
* Please see the COPYING and CONTRIBUTORS files for details.
QUESTIONS
Questions on the usage of this program can be sent to the Squid Users mailing list <squid-
users@lists.squid-cache.org>
REPORTING BUGS
Bug reports need to be made in English. See http://wiki.squid-
cache.org/SquidFaq/BugReporting for details of what you need to include with your bug
report.
Report bugs or bug fixes using http://bugs.squid-cache.org/
Report serious security bugs to Squid Bugs <squid-bugs@lists.squid-cache.org>
Report ideas for new improvements to the Squid Developers mailing list <squid-
dev@lists.squid-cache.org>
SEE ALSO
cachemgr.cgi (8), squidclient (1), basic_pam_auth (8), basic_ldap_auth (8),
ext_ldap_group_acl (8), ext_session_acl (8), ext_unix_group_acl (8),
The Squid FAQ wiki http://wiki.squid-cache.org/SquidFaq
The Squid Configuration Manual http://www.squid-cache.org/Doc/config/
squid(8)