boundary="==_Exmh_11592538600"
This is a multipart MIME message.
--==_Exmh_11592538600
I thought by eliminating hard disks Squid would perform much faster, but
I'm only seeing ~110 responses/second from my lab test configuration:
Sun Ultra 5, 270 MHz, 1 GB RAM (remove the floppy disk and you can put 4 tall
256 MB "Ultra 10" DIMMs in an Ultra 5)
Solaris 2.7
1x4 GB IDE disk, not used for caching or swapping
Squid Cache: Version 2.2.STABLE5
cache_dir /squid_cache 256 16 256
(or cache_dir /squid_cache 768 16 256; made no difference)
cache_mem 64 MB
/squid_cache is a Solaris tmpfs type file system which uses swap space, which
in turn uses RAM first, and only if it runs out of RAM will it use hard disk
space that is defined as part of swap -- and I have no hard disk space defined
as swap:
> swap -l
No swap devices configured
> egrep swap /etc/vfstab
swap - /tmp tmpfs - yes -
swap - /squid_cache tmpfs - yes -
Squid logging is minimized:
cache_access_log /dev/null
cache_store_log none
Am using Polygraph 1.3.1 with roughtly the "datacomm-1" benchmark settings to
generate load and report results (mimor modification I made include reducing
launch_win & decreasing the goal because I usually don't want to wait for 1
hour of results as I tweak squid.conf). If I increase the offered load above
110-120 operatons/sec, Squid can't keep up and pretty soon polyclt crashes
because of too many open connections.
Squid uses about 88% of the CPU while running. I know a 270 MHz UltraSPARC
isn't the latest or fastest (even within the Sun product line, not to mention
Intel/AMD), but I hoped without hard disks to slow it down that Squid would do
a lot better.
Here's "top" output from with an offered load of 110 requests/sec:
load averages: 1.09, 0.68, 0.31 17:07:36
55 processes: 53 sleeping, 1 running, 1 on cpu
CPU states: 0.0% idle, 60.4% user, 39.6% kernel, 0.0% iowait, 0.0% swap
Memory: 1024M real, 445M free, 450M swap in use, 600M swap free
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
372 root 1 0 0 105M 104M run 23:16 87.16% squid
398 root 1 0 0 2152K 1600K cpu 0:05 1.87% top
378 nobody 1 49 0 880K 536K sleep 0:18 1.55% unlinkd
313 root 12 58 0 3304K 2976K sleep 0:05 0.03% mibiisa
198 root 1 59 -12 2048K 1128K sleep 0:00 0.03% xntpd
312 root 1 59 0 12M 7368K sleep 0:00 0.01% Xsun
252 root 1 58 0 1840K 1016K sleep 0:03 0.00% sshd
224 root 6 48 0 2472K 2016K sleep 0:01 0.00% vold
132 root 3 58 0 2104K 1048K sleep 0:01 0.00% aiclockmgr
377 nobody 1 12 0 1816K 1200K sleep 0:00 0.00% dnsserver
376 nobody 1 22 0 1816K 1200K sleep 0:00 0.00% dnsserver
108 root 4 28 0 2200K 1384K sleep 0:00 0.00% keyserv
371 root 1 28 0 3480K 800K sleep 0:00 0.00% squid
And here's some vmstat output:
> date; vmstat 5 20
Fri Dec 10 17:03:33 EST 1999
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr dd f0 s1 -- in sy cs us sy id
0 0 0 695024 538040 0 5 4 0 0 0 0 1 0 0 0 290 485 117 9 8 83
0 0 0 614304 456312 0 1 0 0 0 0 0 0 0 0 0 1289 3198 548 62 38 0
0 0 0 614568 456576 0 0 0 0 0 0 0 0 0 0 0 1247 2989 510 59 41 0
0 0 0 614576 456584 0 0 0 0 0 0 0 0 0 0 0 1210 2846 482 63 37 0
0 0 0 614656 456664 0 0 0 0 0 0 0 0 0 0 0 1200 2740 472 55 45 0
0 0 0 614736 456744 0 0 0 0 0 0 0 0 0 0 0 1228 2898 483 57 43 0
0 0 0 614720 456728 0 0 0 0 0 0 0 4 0 0 0 1242 2906 477 59 41 0
0 0 0 614584 456592 0 0 0 0 0 0 0 0 0 0 0 1295 2916 482 59 41 0
0 0 0 614544 456552 0 0 0 0 0 0 0 0 0 0 0 1275 2929 503 62 38 0
0 0 0 614720 456728 0 0 0 0 0 0 0 0 0 0 0 1336 3270 514 62 38 0
0 0 0 614744 456752 0 0 0 0 0 0 0 0 0 0 0 1282 2865 505 58 42 0
0 0 0 614704 456712 0 0 0 0 0 0 0 0 0 0 0 1305 2827 488 60 40 0
0 0 0 614664 456672 0 0 0 0 0 0 0 1 0 0 0 1298 2712 473 63 37 0
0 0 0 614448 456456 0 0 0 0 0 0 0 0 0 0 0 1254 2811 488 61 39 0
0 0 0 614552 456560 0 0 0 0 0 0 0 0 0 0 0 1165 2738 472 57 43 0
0 0 0 614584 456592 0 0 0 0 0 0 0 0 0 0 0 1253 2791 489 58 42 0
0 0 0 614600 456608 0 0 0 0 0 0 0 0 0 0 0 1306 2944 489 59 41 0
0 0 0 614520 456528 0 0 0 0 0 0 0 0 0 0 0 1319 3128 508 64 36 0
0 0 0 614568 456576 0 0 0 0 0 0 0 1 0 0 0 1235 2977 496 62 38 0
I've seen some messages in the (excellent and still up) mailing list archive
at
http://www.progressive-comp.com/Lists/?l=squid-users&r=1&w=2
to the effect that UFS is the problem; I guess even when the file system
physically resides in RAM it's still a major performance problem?
Comments?
Peter
Peter Jenny
GTE Internetworking - powered by BBN
3 Van de Graaff Drive, PO Box 3073, Burlington MA, 01803
pjenny@bbn.com http://www.bbn.com
Tel: 781-262-6041 Fax: 978-428-7020
P.S. squid.conf file attached below if interested
--==_Exmh_11592538600
Content-Type: text/plain ; name="squid_991209_1614.conf"; charset=us-ascii
Content-Description: squid_991209_1614.conf
Content-Disposition: attachment; filename="squid_991209_1614.conf"
# WELCOME TO SQUID 2
# ------------------
#
# This is the default Squid configuration file. You may wish
# to look at http://cache.is.co.za/squid/ for documentation,
# or the Squid home page (http://squid.nlanr.net/) for the FAQ.
#
# NETWORK OPTIONS
# -----------------------------------------------------------------------------
# TAG: http_port
# The port number where Squid will listen for HTTP client
# requests. Default is 3128, for httpd-accel mode use port 80.
# May be overridden with -a on the command line.
#
# You may specify multiple ports here, but they MUST all be on
# a single line.
#
#http_port 3128
http_port 80
# TAG: icp_port
# The port number where Squid sends and receives ICP requests to
# and from neighbor caches. Default is 3130. To disable use
# "0". May be overridden with -u on the command line.
#
#icp_port 3130
# TAG: htcp_port
# The port number where Squid sends and receives ICP requests to
# and from neighbor caches. Default is 4827. To disable use
# "0".
#
#htcp_port 4827
# TAG: mcast_groups
# This tag specifies a list of multicast groups which your server
# should join to receive multicasted ICP requests.
#
# NOTE! Be very careful what you put here! Be sure you
# understand the difference between an ICP _query_ and an ICP
# _reply_. This option is to be set only if you want to RECEIVE
# multicast queries. Do NOT set this option to SEND multicast
# ICP (use cache_peer for that). ICP replies are always sent via
# unicast, so this option does not affect whether or not you will
# receive replies from multicast group members.
#
# You must be very careful to NOT use a multicast address which
# is already in use by another group of caches. NLANR has been
# assigned a block of multicast address space for use in Web
# Caching. Plese write to us at nlanr-cache@nlanr.net to receive
# an address for your own use.
#
# If you are unsure about multicast, please read the Multicast
# chapter in the Squid FAQ (http://squid.nlanr.net/Squid/FAQ/).
#
# Usage: mcast_groups 239.128.16.128 224.0.1.20
#
# By default, Squid doesn't listen on any multicast groups.
#
#mcast_groups 239.128.16.128
# TAG: tcp_incoming_address
# TAG: tcp_outgoing_address
# TAG: udp_incoming_address
# TAG: udp_outgoing_address
# Usage: tcp_incoming_address 10.20.30.40
# udp_outgoing_address fully.qualified.domain.name
#
# tcp_incoming_address is used for the HTTP socket which accepts
# connections from clients and other caches.
# tcp_outgoing_address is used for connections made to remote
# servers and other caches.
# udp_incoming_address is used for the ICP socket receiving packets
# from other caches.
# udp_outgoing_address is used for ICP packets sent out to other
# caches.
#
# The default behaviour is to not bind to any specific address.
#
# NOTE, udp_incoming_address and udp_outgoing_address can not
# have the same value (unless it is 0.0.0.0) since they both use
# port 3130.
#
#tcp_incoming_address 0.0.0.0
#tcp_outgoing_address 0.0.0.0
#udp_incoming_address 0.0.0.0
#udp_outgoing_address 0.0.0.0
# OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM
# -----------------------------------------------------------------------------
# TAG: cache_peer
# To specify other caches in a hierarchy, use the format:
#
# hostname type http_port icp_port
#
# For example,
#
# # proxy icp
# # hostname type port port options
# # -------------------- -------- ----- ----- -----------
# cache_peer parent.foo.net parent 3128 3130 [proxy-only]
# cache_peer sib1.foo.net sibling 3128 3130 [proxy-only]
# cache_peer sib2.foo.net sibling 3128 3130 [proxy-only]
#
# type: either 'parent', 'sibling', or 'multicast'.
#
# proxy_port: The port number where the cache listens for proxy
# requests.
#
# icp_port: Used for querying neighbor caches about
# objects. To have a non-ICP neighbor
# specify '7' for the ICP port and make sure the
# neighbor machine has the UDP echo port
# enabled in its /etc/inetd.conf file.
#
# options: proxy-only
# weight=n
# ttl=n
# no-query
# default
# round-robin
# multicast-responder
# closest-only
# no-digest
# no-netdb-exchange
# no-delay
# login=user:password
#
# use 'proxy-only' to specify that objects fetched
# from this cache should not be saved locally.
#
# use 'weight=n' to specify a weighted parent.
# The weight must be an integer. The default weight
# is 1, larger weights are favored more.
#
# use 'ttl=n' to specify a IP multicast TTL to use
# when sending an ICP request to this address.
# Only useful when sending to a multicast group.
# Because we don't accept ICP replies from random
# hosts, you must configure other group members as
# peers with the 'multicast-responder' option below.
#
# use 'no-query' to NOT send ICP queries to this
# neighbor.
#
# use 'default' if this is a parent cache which can
# be used as a "last-resort." You should probably
# only use 'default' in situations where you cannot
# use ICP with your parent cache(s).
#
# use 'round-robin' to define a set of parents which
# should be used in a round-robin fashion in the
# absence of any ICP queries.
#
# 'multicast-responder' indicates that the named peer
# is a member of a multicast group. ICP queries will
# not be sent directly to the peer, but ICP replies
# will be accepted from it.
#
# 'closest-only' indicates that, for ICP_OP_MISS
# replies, we'll only forward CLOSEST_PARENT_MISSes
# and never FIRST_PARENT_MISSes.
#
# use 'no-digest' to NOT request cache digests from
# this neighbor.
#
# 'no-netdb-exchange' disables requesting ICMP
# RTT database (NetDB) from the neighbor.
#
# use 'no-delay' to prevent access to this neighbor
# from influencing the delay pools.
#
# use 'login=user:password' if this is a personal/workgroup
# proxy and your parent requires proxy authentication.
#
# NOTE: non-ICP neighbors must be specified as 'parent'.
#
#cache_peer hostname type 3128 3130
# TAG: cache_peer_domain
# Use to limit the domains for which a neighbor cache will be
# queried. Usage:
#
# cache_peer_domain cache-host domain [domain ...]
# cache_peer_domain cache-host !domain
#
# For example, specifying
#
# cache_peer_domain parent.foo.net .edu
#
# has the effect such that UDP query packets are sent to
# 'bigserver' only when the requested object exists on a
# server in the .edu domain. Prefixing the domainname
# with '!' means that the cache will be queried for objects
# NOT in that domain.
#
# NOTE: * Any number of domains may be given for a cache-host,
# either on the same or separate lines.
# * When multiple domains are given for a particular
# cache-host, the first matched domain is applied.
# * Cache hosts with no domain restrictions are queried
# for all requests.
# * There are no defaults.
# * There is also a 'cache_peer_access' tag in the ACL
# section.
# TAG: neighbor_type_domain
# usage: neighbor_type_domain parent|sibling domain domain ...
#
# Modifying the neighbor type for specific domains is now
# possible. You can treat some domains differently than the the
# default neighbor type specified on the 'cache_peer' line.
# Normally it should only be necessary to list domains which
# should be treated differently because the default neighbor type
# applies for hostnames which do not match domains listed here.
#
#EXAMPLE:
# cache_peer parent cache.foo.org 3128 3130
# neighbor_type_domain cache.foo.org sibling .com .net
# neighbor_type_domain cache.foo.org sibling .au .de
# TAG: icp_query_timeout (msec)
# Normally Squid will automatically determine an optimal ICP
# query timeout value based on the round-trip-time of recent ICP
# queries. If you want to override the value determined by
# Squid, set this 'icp_query_timeout' to a non-zero value. This
# value is specified in MILLISECONDS, so, to use a 2-second
# timeout (the old default), you would write:
#
# icp_query_timeout 2000
#
#icp_query_timeout 0
# TAG: mcast_icp_query_timeout (msec)
# For Multicast peers, Squid regularly sends out ICP "probes" to
# count how many other peers are listening on the given multicast
# address. This value specifies how long Squid should wait to
# count all the replies. The default is 2000 msec, or 2
# seconds.
#
#mcast_icp_query_timeout 2000
# TAG: dead_peer_timeout (seconds)
# This controls how long Squid waits to declare a peer cache
# as "dead." If there are no ICP replies received in this
# amount of time, Squid will declare the peer dead and not
# expect to receive any further ICP replies. However, it
# continues to send ICP queries, and will mark the peer as
# alive upon receipt of the first subsequent ICP reply.
#
# This timeout also affects when Squid expects to receive ICP
# replies from peers. If more than 'dead_peer' seconds have
# passed since the last ICP reply was received, Squid will not
# expect to receive an ICP reply on the next query. Thus, if
# your time between requests is greater than this timeout, you
# will see a lot of requests sent DIRECT to origin servers
# instead of to your parents.
#
#dead_peer_timeout 10 seconds
# TAG: hierarchy_stoplist
# A list of words which, if found in a URL, cause the object to
# be handled directly by this cache. In other words, use this
# to not query neighbor caches for certain objects. You may
# list this option multiple times.
#
# The default is to directly fetch URLs containing 'cgi-bin' or '?'.
#
hierarchy_stoplist cgi-bin ?
# TAG: no_cache
# A list of ACL elements which, if matched, cause the reply to
# immediately removed from the cache. In other words, use this
# to force certain objects to never be cached.
#
# You must use the word 'DENY' to indicate the ACL names which should
# NOT be cached.
#
# There is no default. We recommend you uncomment the following
# two lines.
#
acl QUERY urlpath_regex cgi-bin \?
no_cache deny QUERY
# OPTIONS WHICH AFFECT THE CACHE SIZE
# -----------------------------------------------------------------------------
# TAG: cache_mem (bytes)
# NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS
# SIZE. IT PLACES A LIMIT ON ONE ASPECT OF SQUID'S MEMORY
# USAGE. SQUID USES MEMORY FOR OTHER THINGS AS WELL.
# YOUR PROCESS WILL PROBABLY BECOME TWICE OR THREE TIMES
# BIGGER THAN THE VALUE YOU PUT HERE
#
# 'cache_mem' specifies the ideal amount of memory to be used
# for:
# * In-Transit objects
# * Hot Objects
# * Negative-Cached objects
#
# Data for these objects are stored in 4 KB blocks. This
# parameter specifies the ideal upper limit on the total size of
# 4 KB blocks allocated. In-Transit objects take the highest
# priority.
#
# In-transit objects have priority over the others. When
# additional space is needed for incoming data, negative-cached
# and hot objects will be released. In other words, the
# negative-cached and hot objects will fill up any unused space
# not needed for in-transit objects.
#
# If circumstances require, this limit will be exceeded.
# Specifically, if your incoming request rate requires more than
# 'cache_mem' of memory to hold in-transit objects, Squid will
# exceed this limit to satisfy the new requests. When the load
# decreases, blocks will be freed until the high-water mark is
# reached. Thereafter, blocks will be used to store hot
# objects.
#
# The values of cache_mem_low and cache_mem_high (below) can be
# used to tune the use of the memory pool. When the high mark is
# reached, in-transit and hot objects will be released to clear
# space. When an object transfer is completed, it will remain in
# memory only if the current memory usage is below the low water
# mark.
#
# The default is 8 Megabytes.
#
cache_mem 64 MB
# TAG: cache_swap_low (percent, 0-100)
# TAG: cache_swap_high (percent, 0-100)
# The low- and high-water marks for cache LRU replacement. LRU
# replacement begins when the high-water mark is reached and ends
# when enough objects have been removed and the low-water mark is
# reached. Defaults are 90% and 95%. If you have a large cache, 5%
# could be hundreds of MB. If this is the case you may wish to
# set these numbers closer together.
#
cache_swap_low 90
cache_swap_high 95
# TAG: cache_mem_low (in percent, 0-100)
# TAG: cache_mem_high (in percent, 0-100)
# The low- and high-water mark for cache memory storage. When
# the amount of RAM used by the hot-object RAM cache reaches this
# point, the cache starts throwing objects out of the RAM cache
# (but they remain on disk). Defaults are 75% and 90%.
#
#cache_mem_low 75
#cache_mem_high 90
# TAG: maximum_object_size (bytes)
# Objects larger than this size will NOT be saved on disk. The
# value is specified in kilobytes, and the default is 4MB. If
# you wish to get a high BYTES hit ratio, you should probably
# increase this (one 32 MB object hit counts for 3200 10KB
# hits). If you wish to increase speed more than your want to
# save bandwidth you should leave this low.
#
maximum_object_size 16384 KB
# TAG: ipcache_size (number of entries)
# TAG: ipcache_low (percent)
# TAG: ipcache_high (percent)
# The size, low-, and high-water marks for the IP cache.
#
#ipcache_size 1024
#ipcache_low 90
#ipcache_high 95
# TAG: fqdncache_size (number of entries)
# Maximum number of FQDN cache entries.
#fqdncache_size 1024
# LOGFILE PATHNAMES AND CACHE DIRECTORIES
# -----------------------------------------------------------------------------
# TAG: cache_dir
# Usage:
#
# cache_dir Directory-Name Mbytes Level-1 Level2
#
# You can specify multiple cache_dir lines to spread the
# cache among different disk partitions.
#
# 'Directory' is a top-level directory where cache swap
# files will be stored. If you want to use an entire disk
# for caching, then this can be the mount-point directory.
# The directory must exist and be writable by the Squid
# process. Squid will NOT create this directory for you.
#
# If no 'cache_dir' lines are specified, the following
# default will be used: /usr/local/squid/cache.
#
# 'Mbytes' is the amount of disk space (MB) to use under this
# directory. The default is 100 MB. Change this to suit your
# configuration.
#
# 'Level-1' is the number of first-level subdirectories which
# will be created under the 'Directory'. The default is 16.
#
# 'Level-2' is the number of second-level subdirectories which
# will be created under each first-level directory. The default
# is 256.
#
cache_dir /squid_cache 256 16 256
#cache_dir /squid_cache 768 16 256
# TAG: cache_access_log
# Logs the client request activity. Contains an entry for
# every HTTP and ICP request received.
#
#cache_access_log /usr/local/squid/logs/access.log
cache_access_log /dev/null
# TAG: cache_log
# Cache logging file. This is where general information about
# your cache's behaviour goes. You can increase the amount of data
# logged to this file with the "debug_options" tag below.
#
cache_log /usr/local/squid/logs/cache.log
# TAG: cache_store_log
# Logs the activities of the storage manager. Shows which
# objects are ejected from the cache, and which objects are
# saved and for how long. To disable, enter "none". There are
# not really utilities to analyse this data, so you can safely
# disable it.
#
#cache_store_log /usr/local/squid/logs/store.log
cache_store_log none
# TAG: cache_swap_log
# Location for the cache "swap.log." This log file holds the
# metadata of objects saved on disk. It is used to rebuild the
# cache during startup. Normally this file resides in the first
# 'cache_dir' directory, but you may specify an alternate
# pathname here. Note you must give a full filename, not just
# a directory. Since this is the index for the whole object
# list you CANNOT periodically rotate it!
#
#cache_swap_log
# TAG: emulate_httpd_log on|off
# The Cache can emulate the log file format which many 'httpd'
# programs use. To disable/enable this emulation, set
# emulate_httpd_log to 'off' or 'on'. The default
# is to use the native log format since it includes useful
# information that Squid-specific log analysers use.
#
#emulate_httpd_log off
# TAG: mime_table
# Pathname to Squid's MIME table. You shouldn't need to change
# this, but the default file contains examples and formatting
# information if you do.
#
#mime_table /usr/local/squid/etc/mime.conf
# TAG: log_mime_hdrs on|off
# The Cache can record both the request and the response MIME
# headers for each HTTP transaction. The headers are encoded
# safely and will appear as two bracketed fields at the end of
# the access log (for either the native or httpd-emulated log
# formats). To enable this logging set log_mime_hdrs to 'on'.
#
#log_mime_hdrs off
# TAG: useragent_log
# If configured with the "--enable-useragent_log" configure
# option, Squid will write the User-Agent field from HTTP
# requests to the filename specified here. By default
# useragent_log is disabled.
#
#useragent_log none
# TAG: pid_filename
# A filename to write the process-id to. To disable, enter "none".
#
#pid_filename /usr/local/squid/logs/squid.pid
# TAG: debug_options
# Logging options are set as section,level where each source file
# is assigned a unique section. Lower levels result in less
# output, Full debugging (level 9) can result in a very large
# log file, so be careful. The magic word "ALL" sets debugging
# levels for all sections. We recommend normally running with
# "ALL,1".
#
#debug_options ALL,1
# TAG: ident_lookup on|off
# If you wish to make an RFC931/ident lookup of the client
# username for each connection, enable this. It is off by
# default.
#
#ident_lookup off
# TAG: log_fqdn on|off
# Turn this on if you wish to log fully qualified domain names
# in the access.log. To do this Squid does a DNS lookup of all
# IP's connecting to it. This can (in some situations) increase
# latency, which makes your cache seem slower for interactive
# browsing.
#
log_fqdn off
# TAG: client_netmask
# A netmask for client addresses in logfiles and cachemgr output.
# Change this to protect the privacy of your cache clients.
# A netmask of 255.255.255.0 will log all IP's in that range with
# the last digit set to '0'.
#
#client_netmask 255.255.255.255
# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS
# -----------------------------------------------------------------------------
# TAG: ftp_user
# If you want the anonymous login password to be more informative
# (and enable the use of picky ftp servers), set this to something
# resonable for your domain, like wwwuser@somewhere.net
#
# The reason why this is domainless by default is that the
# request can be made on the behalf of a user in any domain,
# depending on how the cache is used.
# Some ftp server also validate that the email address is valid
# (for example perl.com).
#
#ftp_user Squid@
# TAG: ftp_list_width
# Sets the width of ftp listings. This should be set to fit in
# the width of a standard browser. Setting this too small
# can cut off long filenames when browsing ftp sites.
#
#ftp_list_width 32
# TAG: cache_dns_program
# Specify the location of the executable for dnslookup process.
#
#cache_dns_program /usr/local/squid/bin/dnsserver
# TAG: dns_children
# The number of processes spawn to service DNS name lookups.
# For heavily loaded caches on large servers, you should
# probably increase this value to at least 10. The maximum
# is 32. The default is 5.
#
# To disable dnsservers, set this to 0. NOTE, this is very
# strongly discouraged. If you disable dnsservers your Squid
# process will BLOCK on DNS lookups!
#
#dns_children 5
# TAG: dns_defnames on|off
# Normally the 'dnsserver' disables the RES_DEFNAMES resolver
# option (see res_init(3)). This prevents caches in a hierarchy
# from interpreting single-component hostnames locally. To allow
# dnsserver to handle single-component names, enable this
# option.
#
#dns_defnames off
# TAG: dns_nameservers
# Use this if you want to specify a list of DNS name servers
# (IP addresses) to use instead of those given in your
# /etc/resolv.conf file.
#
# Example: dns_nameservers 10.0.0.1 192.172.0.4
#
#dns_nameservers none
# TAG: unlinkd_program
# Specify the location of the executable for file deletion process.
# This isn't needed if you are using async-io since it's handled by
# a thread.
#
#unlinkd_program /usr/local/squid/bin/unlinkd
# TAG: pinger_program
# Specify the location of the executable for the pinger process.
# This is only useful if you configured Squid (during compliation)
# with the '--enable-icmp' option.
#
#pinger_program /usr/local/squid/bin/pinger
# TAG: redirect_program
# Specify the location of the executable for the URL redirector.
# Since they can perform almost any function there isn't one included.
# See the Release-Notes for information on how to write one.
# By default, a redirector is not used.
#
#redirect_program none
# TAG: redirect_children
# The number of redirector processes to spawn. If you start
# too few Squid will have to wait for them to process a backlog of
# URLs, slowing it down. If you start too many they will use RAM
# and other system resources.
#
#redirect_children 5
# TAG: redirect_rewrites_host_header
# By default Squid rewrites any Host: header in redirected requests.
# If you are running a accelerator then this may not be a wanted effect
# of a redirector.
#redirect_rewrites_host_header on
# TAG: authenticate_program
# Specify the command for the external authenticator. Such a
# program reads a line containing "username password" and replies
# "OK" or "ERR" in an endless loop. If you use an authenticator,
# make sure you have 1 acl of type proxy_auth. By default, the
# authenticator_program is not used.
#
# If you want to use the traditional proxy authentication,
# jump over to the ../auth_modules/NCSA directory and
# type:
# % make
# % make install
#
# Then, set this line to something like
#
# authenticate_program /usr/local/squid/bin/ncsa_auth /usr/local/squid/etc/passwd
#
#authenticate_program none
# TAG: authenticate_children
# The number of authenticator processes to spawn (default 5). If you
# start too few Squid will have to wait for them to process a backlog
# of usercode/password verifications, slowing it down. When password
# verifications are done via a (slow) network you are likely to need
# lots of authenticator processes.
#
#authenticate_children 5
# TAG: authenticate_ttl
# The time a checked username/password combination remains cached
# (default 3600). If a wrong password is given for a cached user,
# the user gets removed from the username/password cache forcing
# a revalidation.
#
#authenticate_ttl 3600
# OPTIONS FOR TUNING THE CACHE
# -----------------------------------------------------------------------------
# TAG: wais_relay_host
# TAG: wais_relay_port
# Relay WAIS request to host (1st arg) at port (2 arg).
#
#wais_relay_host localhost
#wais_relay_port 8000
# TAG: request_size (KB)
# Maximum allowed request size in kilobytes. If people are using
# POST to upload files, then set this to the largest acceptable
# filesize plus a few extra kbytes.
#
#request_size 100 KB
# TAG: refresh_pattern
# usage: refresh_pattern [-i] regex min percent max [options]
#
# By default, regular expressions are CASE-SENSITIVE. To make
# them case-insensitive, use the -i option.
#
# min and max are specified in MINUTES.
# percent is an integer number.
#
# options: override-expire
# override-lastmod
# reload-into-ims
# ignore-reload
#
# override-expire enforces min age even if the server
# sent a Expires: header. Doing this VIOLATES the HTTP
# standard. Enabling this feature could make you liable
# for problems which it causes.
#
# override-lastmod enforces min age even on objects
# that was modified recently.
#
# reload-into-ims changes client no-cache or ``reload''
# to If-Modified-Since requests. Doing this VIOLATES the
# HTTP standard. Enabling this feature could make you
# liable for problems which it causes.
#
# ignore-reload ignores a client no-cache or ``reload''
# header. Doing this VIOLATES the HTTP standard. Enabling
# this feature could make you liable for problems which
# it causes.
#
# Please see the file doc/Release-Notes-1.1.txt for a full
# description of Squid's refresh algorithm. Basically a
# cached object is: (the order is changed from 1.1.X)
#
# STALE if age > max
# FRESH if expires < now, else STALE
# FRESH if lm-factor < percent, else STALE
# FRESH if age < min
# else STALE
#
# The refresh_pattern lines are checked in the order listed here.
# The first entry which matches is used. If none of the entries
# match, then the default will be used.
#
#Default:
#refresh_pattern . 0 20% 4320
# TAG: reference_age
# As a part of normal operation, Squid performs Least Recently
# Used removal of cached objects. The LRU age for removal is
# computed dynamically, based on the amount of disk space in
# use. The dynamic value can be seen in the Cache Manager 'info'
# output.
#
# The 'reference_age' parameter defines the maximum LRU age. For
# example, setting reference_age to '1 week' will cause objects
# to be removed if they have not been accessed for a week or
# more. The default value is one month.
#
# Specify a number here, followed by units of time. For example:
# 1 week
# 3.5 days
# 4 months
# 2.2 hours
#
#reference_age 1 month
# TAG: quick_abort_min (KB)
# TAG: quick_abort_max (KB)
# TAG: quick_abort_pct (percent)
# The cache can be configured to continue downloading aborted
# requests. This may be undesirable on slow (e.g. SLIP) links
# and/or very busy caches. Impatient users may tie up file
# descriptors and bandwidth by repeatedly requesting and
# immediately aborting downloads.
#
# When the user aborts a request, Squid will check the
# quick_abort values to the amount of data transfered until
# then.
#
# If the transfer has less than 'quick_abort_min' KB remaining,
# it will finish the retrieval. Setting 'quick_abort_min' to -1
# will disable the quick_abort feature.
#
# If the transfer has more than 'quick_abort_max' KB remaining,
# it will abort the retrieval.
#
# If more than 'quick_abort_pct' of the transfer has completed,
# it will finish the retrieval.
#
#quick_abort_min 16 KB
#quick_abort_max 16 KB
#quick_abort_pct 95
# TAG: negative_ttl time-units
# Time-to-Live (TTL) for failed requests. Certain types of
# failures (such as "connection refused" and "404 Not Found") are
# negatively-cached for a configurable amount of time. The
# default is 5 minutes. Note that this is different from
# negative caching of DNS lookups.
#
#negative_ttl 5 minutes
# TAG: positive_dns_ttl time-units
# Time-to-Live (TTL) for positive caching of successful DNS lookups.
# Default is 6 hours (360 minutes). If you want to minimize the
# use of Squid's ipcache, set this to 1, not 0.
#
#positive_dns_ttl 6 hours
# TAG: negative_dns_ttl time-units
# Time-to-Live (TTL) for negative caching of failed DNS lookups.
#
#negative_dns_ttl 5 minutes
# TAG: range_offset_limit (bytes)
# Sets a upper limit on how far into the the file a Range request
# may be to cause Squid to prefetch the whole file. If beyond this
# limit then Squid forwards the Range request as it is and the result
# is NOT cached.
#
# This is to stop a far ahead range request (lets say start at 17MB)
# from making Squid fetch the whole object up to that point before
# sending anything to the client.
#
# A value of -1 causes Squid to always fetch the object from the
# beginning so that it may cache the result. (2.0 style)
#
# A value of 0 causes Squid to never fetch more than the client
# client requested. (default)
#
#range_offset_limit 0 KB
# TIMEOUTS
# -----------------------------------------------------------------------------
# TAG: connect_timeout time-units
# Some systems (notably Linux) can not be relied upon to properly
# time out connect(2) requests. Therefore the Squid process
# enforces its own timeout on server connections. This parameter
# specifies how long to wait for the connect to complete. The
# default is two minutes (120 seconds).
#
#connect_timeout 120 seconds
# TAG: siteselect_timeout time-units
# For URN to multiple URL's URL selection
#
#siteselect_timeout 4 seconds
# TAG: read_timeout time-units
# The read_timeout is applied on server-side connections. After
# each successful read(), the timeout will be extended by this
# amount. If no data is read again after this amount of time,
# the request is aborted and logged with ERR_READ_TIMEOUT. The
# default is 15 minutes.
#
#read_timeout 15 minutes
# TAG: request_timeout
# How long to wait for an HTTP request after connection
# establishment. For persistent connections, wait this long
# after the previous request completes.
#
#request_timeout 30 seconds
# TAG: client_lifetime time-units
# The maximum amount of time that a client (browser) is allowed to
# remain connected to the cache process. This protects the Cache
# from having alot of sockets (and hence file descriptors) tied up
# in a CLOSE_WAIT state from remote clients that go away without
# properly shutting down (either because of a network failure or
# because of a poor client implementation). The default is one
# day, 1440 minutes.
#
# NOTE: The default value is intended to be much larger than any
# client would ever need to be connected to your cache. You
# should probably change client_lifetime only as a last resort.
# If you seem to have many client connections tying up
# filedescriptors, we recommend first tuning the read_timeout,
# request_timeout, pconn_timeout and quick_abort values.
#
#client_lifetime 1 day
# TAG: half_closed_clients
# Some clients may shutdown the sending side of their TCP
# connections, while leaving their receiving sides open. Sometimes,
# Squid can not tell the difference between a half-closed and a
# fully-closed TCP connection. By default, half-closed client
# connections are kept open until a read(2) or write(2) on the
# socket returns an error. Change this option to 'off' and Squid
# will immediately close client connections when read(2) returns
# "no more data to read."
#
#half_closed_clients on
# TAG: pconn_timeout
# Timeout for idle persistent connections to servers and other
# proxies.
#pconn_timeout 120 seconds
# TAG: shutdown_lifetime time-units
# When SIGTERM or SIGHUP is received, the cache is put into
# "shutdown pending" mode until all active sockets are closed.
# This value is the lifetime to set for all open descriptors
# during shutdown mode. Any active clients after this many
# seconds will receive a 'timeout' message.
#
#shutdown_lifetime 30 seconds
# ACCESS CONTROLS
# -----------------------------------------------------------------------------
# TAG: acl
# Defining an Access List
#
# acl aclname acltype string1 ...
# acl aclname acltype "file" ...
#
# when using "file", the file should contain one item per line
#
# acltype is one of src dst srcdomain dstdomain url_pattern
# urlpath_pattern time port proto method browser user
#
# acl aclname src ip-address/netmask ... (clients IP address)
# acl aclname src addr1-addr2/netmask ... (range of addresses)
# acl aclname dst ip-address/netmask ... (URL host's IP address)
#
# acl aclname srcdomain foo.com ... # reverse lookup, client IP
# acl aclname dstdomain foo.com ... # Destination server from URL
# acl aclname srcdom_regex xxx ... # regex matching client name
# acl aclname dstdom_regex xxx ... # regex matching server
# # For dstdomain and dstdom_regex a reverse lookup is tried if a IP
# # based URL is used. The name "none" is used if the reverse lookup
# # fails.
#
# acl aclname time [day-abbrevs] [h1:m1-h2:m2]
# day-abbrevs:
# S - Sunday
# M - Monday
# T - Tuesday
# W - Wednesday
# H - Thursday
# F - Friday
# A - Saturday
# h1:m1 must be less than h2:m2
# acl aclname url_regex ^http:// ... # regex matching on whole URL
# acl aclname urlpath_regex \.gif$ ... # regex matching on URL path
# acl aclname port 80 70 21 ...
# acl aclname port 0-1024 ... # ranges allowed
# acl aclname proto HTTP FTP ...
# acl aclname method GET POST ...
# acl aclname browser regexp
# acl aclname ident username ...
# # string match on ident output.
# # use REQUIRED to accept any non-null ident.
# acl aclname src_as number ...
# acl aclname dst_as number ...
# # Except for access control, AS numbers can be used for
# # routing of requests to specific caches. Here's an
# # example for routing all requests for AS#1241 and only
# # those to mycache.mydomain.net:
# # acl asexample dst_as 1241
# # cache_peer_access mycache.mydomain.net allow asexample
# # cache_peer_access mycache_mydomain.net deny all
#
# acl aclname proxy_auth username ...
# # list of valid usernames
# # use REQUIRED to accept any valid username.
# #
# # NOTE: when a Proxy-Authentication header is sent but it is not
# # needed during ACL checking the username is NOT logged
# # in access.log.
# #
# # NOTE: proxy_auth requires a EXTERNAL authentication program
# # to check username/password combinations (see
# # authenticate_program).
# #
# # WARNING: proxy_auth can't be used in a transparent proxy. It
# # collides with any authentication done by origin servers. It may
# # seem like it works at first, but it doesn't.
#
#
#Examples:
#acl myexample dst_as 1241
#acl password proxy_auth 300
#
#Defaults:
acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl SSL_ports port 443 563
acl Safe_ports port 80 21 443 563 70 210 1025-65535
acl CONNECT method CONNECT
# TAG: http_access
# Allowing or Denying access based on defined access lists
#
# Access to the HTTP port:
# http_access allow|deny [!]aclname ...
#
# Access to the ICP port:
# icp_access allow|deny [!]aclname ...
#
# NOTE on default values:
#
# If there are no "access" lines present, the default is to allow
# the request.
#
# If none of the "access" lines cause a match, the default is the
# opposite of the last line in the list. If the last line was
# deny, then the default is allow. Conversely, if the last line
# is allow, the default will be deny. For these reasons, it is a
# good idea to have an "deny all" or "allow all" entry at the end
# of your access lists to avoid potential confusion.
#
#Default configuration:
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
#
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
http_access allow all
#
http_access deny all
# TAG: icp_access
# Reply to all ICP queries we receive
#
icp_access allow all
# TAG: miss_access
# Use to force your neighbors to use you as a sibling instead of
# a parent. For example:
#
# acl localclients src 172.16.0.0/16
# miss_access allow localclients
# miss_access deny !localclients
#
# This means that only your local clients are allowed to fetch
# MISSES and all other clients can only fetch HITS.
#
# By default, allow all clients who passed the http_access rules
# to fetch MISSES from us.
#miss_access allow all
#
# TAG: cache_peer_access
# Similar to 'cache_peer_domain' but provides more flexibility by
# using ACL elements.
#
# cache_peer_access cache-host allow|deny [!]aclname ...
#
# The syntax is identical to 'http_access' and the other lists of
# ACL elements. See the comments for 'http_access' below, or
# the Squid FAQ (http://squid.nlanr.net/Squid/FAQ/FAQ-10.html).
# TAG: proxy_auth_realm
# Specifies the realm name which is to be reported to the client for
# proxy authentication (part of the text the user will see when
# prompted their username and password).
#
#proxy_auth_realm Squid proxy-caching web server
# ADMINISTRATIVE PARAMETERS
# -----------------------------------------------------------------------------
# TAG: cache_mgr
# Email-address of local cache manager who will receive
# mail if the cache dies. The default is "webmaster."
#
cache_mgr pjenny@bbn.com
# TAG: cache_effective_user
# TAG: cache_effective_group
#
# If the cache is run as root, it will change its effective/real
# UID/GID to the UID/GID specified below. The default is to
# change to UID to nobody and GID to nogroup.
#
# If Squid is not started as root, the default is to keep the
# current UID/GID. Note that if Squid is not started as root then
# you cannot set http_port to a value lower than 1024.
#
#cache_effective_user nobody
#cache_effective_group nogroup
# TAG: visible_hostname
# If you want to present a special hostname in error messages, etc,
# then define this. Otherwise, the return value of gethostname()
# will be used. If you have multiple caches in a cluster and
# get errors about IP-forwarding you must set them to have individual
# names with this setting.
#
visible_hostname cachesun6.nett.bbnplanet.com
# TAG: unique_hostname
# If you want to have multiple machines with the same
# 'visible_hostname' then you must give each machine a different
# 'unique_hostname' so that forwarding loops can be detected.
#
#unique_hostname www-cache1.foo.org
# OPTIONS FOR THE CACHE REGISTRATION SERVICE
# -----------------------------------------------------------------------------
#
# This section contains parameters for the (optional) cache
# announcement service. This service is provided to help
# cache administrators locate one another in order to join or
# create cache hierarchies.
#
# An 'announcement' message is sent (via UDP) to the registration
# service by Squid. By default, the annoucement message is NOT
# SENT unless you enable it with 'announce_period' below.
#
# The announcement message includes your hostname, plus the
# following information from this configuration file:
#
# http_port
# icp_port
# cache_mgr
#
# All current information is processed regularly and made
# available on the Web at http://ircache.nlanr.net/Cache/Tracker/.
# TAG: announce_period
# This is how frequently to send cache announcements. The
# default is `0' which disables sending the announcement
# messages.
#
# To enable announcing your cache, just uncomment the line
# below.
#
#announce_period 1 day
# TAG: announce_host
# TAG: announce_file
# TAG: announce_port
# announce_host and announce_port set the hostname and port
# number where the registration message will be sent.
#
# Hostname will default to 'tracker.ircache.net' and port will
# default default to 3131. If the 'filename' argument is given,
# the contents of that file will be included in the announce
# message.
#
#announce_host tracker.ircache.net
#announce_port 3131
# HTTPD-ACCELERATOR OPTIONS
# -----------------------------------------------------------------------------
# TAG: httpd_accel_host
# TAG: httpd_accel_port
# If you want to run Squid as an httpd accelerator, define the
# host name and port number where the real HTTP server is.
#
# If you want virtual host support then specify the hostname
# as "virtual".
#
# NOTE: enabling httpd_accel_host disables proxy-caching and
# ICP. If you want these features enabled also, then set
# the 'httpd_accel_with_proxy' option.
#
#httpd_accel_host hostname
#httpd_accel_port port
# TAG: httpd_accel_with_proxy on|off
# If you want to use Squid as both a local httpd accelerator
# and as a proxy, change this to 'on'.
#
#httpd_accel_with_proxy off
# TAG: httpd_accel_uses_host_header on|off
# HTTP/1.1 requests include a Host: header which is basically the
# hostname from the URL. Squid can be an accelerator for
# different HTTP servers by looking at this header. However,
# Squid does NOT check the value of the Host header, so it opens
# a big security hole. We recommend that this option remain
# disabled unless you are sure of what you are doing.
#
# However, you will need to enable this option if you run Squid
# as a transparent proxy. Otherwise, virtual servers which
# require the Host: header will not be properly cached.
#httpd_accel_uses_host_header off
# MISCELLANEOUS
# -----------------------------------------------------------------------------
# TAG: dns_testnames
# The DNS tests exit as soon as the first site is successfully looked up
#
# If you want to disable DNS tests, do not comment out or delete this
# list. Instead use the -D command line option
#
#dns_testnames netscape.com internic.net nlanr.net microsoft.com
# TAG: logfile_rotate
# Specifies the number of logfile rotations to make when you
# type 'squid -k rotate'. The default is 10, which will rotate
# with extensions 0 through 9. Setting logfile_rotate to 0 will
# disable the rotation, but the logfiles are still closed and
# re-opened. This will enable you to rename the logfiles
# yourself just before sending the rotate signal.
#
# Note, the 'squid -k rotate' command normally sends a USR1
# signal to the running squid process. In certain situations
# (e.g. on Linux with Async I/O), USR1 is used for other
# purposes, so -k rotate uses another signal. It is best to get
# in the habit of using 'squid -k rotate' instead of 'kill -USR1
# <pid>'.
#
logfile_rotate 10
# TAG: append_domain
# Appends local domain name to hostnames without any dots in
# them. append_domain must begin with a period.
#
append_domain .nett.bbnplanet.com
# TAG: tcp_recv_bufsize (bytes)
# Size of receive buffer to set for TCP sockets. Probably just
# as easy to change your kernel's default. Set to zero to use
# the default buffer size.
#
#tcp_recv_bufsize 0 bytes
# TAG: err_html_text
# HTML text to include in error messages. Make this a "mailto"
# URL to your admin address, or maybe just a link to your
# organizations Web page.
#
# To include this in your error messages, you must rewrite
# the error template files (found in the "errors" directory).
# Wherever you want the 'err_html_text' line to appear,
# insert a %L tag in the error template file.
#err_html_text
# TAG: deny_info
# Usage: deny_info err_page_name acl
# Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys
#
# This can be used to return a ERR_ page for requests which
# do not pass the 'http_access' rules. A single ACL will cause
# the http_access check to fail. If a 'deny_info' line exists
# for that ACL then Squid returns a corresponding error page.
#
# You may use ERR_ pages that come with Squid or create your own pages
# and put them into the configured errors/ directory.
# TAG: memory_pools on|off
# If set, Squid will keep pools of allocated (but unused) memory
# available for future use. If memory is a premium on your
# system and you believe your malloc library outperforms Squid
# routines, disable this.
#
#memory_pools on
# TAG: memory_pools_limit (bytes)
# Used only with memory_pools on:
# memory_pools_limit 50 MB
#
# If set to a non-zero value, Squid will keep at most the specified
# limit of allocated (but unused) memory in memory pools. All free()
# requests that exceed this limit will be handled by your malloc
# library. Squid does not pre-allocate any memory, just safe-keeps
# objects that otherwise would be free()d. Thus, it is safe to set
# memory_pools_limit to a reasonably high value even if your
# configuration will use less memory.
#
# If not set (default) or set to zero, Squid will keep all memory it
# can. That is, there will be no limit on the total amount of memory
# used for safe-keeping.
#
# To disable memory allocation optimization, do not set
# memory_pools_limit to 0. Set memory_pools to "off" instead.
#
# An overhead for maintaining memory pools is not taken into account
# when the limit is checked. This overhead is close to four bytes per
# object kept. However, pools may actually _save_ memory because of
# reduced memory thrashing in your malloc library.
# TAG: forwarded_for on|off
# If set, Squid will include your system's IP address or name
# in the HTTP requests it forwards. By default it looks like
# this:
#
# X-Forwarded-For: 192.1.2.3
#
# If you disable this, it will appear as
#
# X-Forwarded-For: unknown
#
#forwarded_for on
# TAG: log_icp_queries on|off
# If set, ICP queries are logged to access.log. You may wish
# do disable this if your ICP load is VERY high to speed things
# up or to simplify log analysis.
#
#log_icp_queries on
# TAG: icp_hit_stale on|off
# If you want to return ICP_HIT for stale cache objects, set this
# option to 'on'. If you have sibling relationships with caches
# in other administrative domains, this should be 'off'. If you only
# have sibling relationships with caches under your control, then
# it is probably okay to set this to 'on'.
#
#icp_hit_stale off
# TAG: minimum_direct_hops
# If using the ICMP pinging stuff, do direct fetches for sites
# which are no more than this many hops away.
#
#minimum_direct_hops 4
# TAG: cachemgr_passwd
# Specify passwords for cachemgr operations.
#
# Usage: cachemgr_passwd password action action ...
#
# Some valid actions are (see cache manager menu for a full list):
# 5min
# 60min
# asndb
# authenticator
# cbdata
# client_list
# comm_incoming
# config *
# counters
# delay
# digest_stats
# dns
# events
# filedescriptors
# fqdncache
# histograms
# http_headers
# info
# io
# ipcache
# mem
# menu
# netdb
# non_peers
# objects
# pconn
# peer_select
# redirector
# refresh
# server_list
# shutdown *
# store_digest
# storedir
# utilization
# via_headers
# vm_objects
#
# * Indicates actions which will not be performed without a
# valid password, others can be performed if not listed here.
#
# To disable an action, set the password to "disable".
# To allow performing an action without a password, set the
# password to "none".
#
# Use the keyword "all" to set the same password for all actions.
#
#cachemgr_passwd secret shutdown
#cachemgr_passwd lesssssssecret info stats/objects
#cachemgr_passwd disable all
# TAG: store_avg_object_size (kbytes)
# Average object size, used to estimate number of objects your
# cache can hold. See doc/Release-Notes-1.1.txt. The default is
# 13 KB.
#
#store_avg_object_size 13 KB
# TAG: store_objects_per_bucket
# Target number of objects per bucket in the store hash table.
# Lowering this value increases the total number of buckets and
# also the storage maintenance rate. The default is 20.
#
#store_objects_per_bucket 20
# TAG: http_anonymizer
# If you want to filter out certain HTTP request headers for
# privacy reasons, enable this option. There are three
# appropriate settings:
# 'off' All HTTP request headers are passed.
# 'standard' Specific headers are removed
# 'paranoid' Only specific headers are allowed.
# To see which headers are allowed or denied, please see the
# http-anon.c source file.
#
#http_anonymizer off
# TAG: client_db on|off
# If you want to disable collecting per-client statistics, then
# turn off client_db here.
#
#client_db on
# TAG: netdb_low
# TAG: netdb_high
# The low and high water marks for the ICMP measurement
# database. These are counts, not percents. The defaults are
# 900 and 1000. When the high water mark is reached, database
# entries will be deleted until the low mark is reached.
#
#netdb_low 900
#netdb_high 1000
# TAG: netdb_ping_period
# The minimum period for measuring a site. There will be at
# least this much delay between successive pings to the same
# network. The default is five minutes.
#
#netdb_ping_period 5 minutes
# TAG: query_icmp on|off
# If you want to ask your peers to include ICMP data in their ICP
# replies, enable this option.
#
# If your peer has configured Squid (during compilation) with
# '--enable-icmp' then that peer will send ICMP pings to origin server
# sites of the URLs it receives. If you enable this option then the
# ICP replies from that peer will include the ICMP data (if available).
# Then, when choosing a parent cache, Squid will choose the parent with
# the minimal RTT to the origin server. When this happens, the
# hierarchy field of the access.log will be
# "CLOSEST_PARENT_MISS". This option is off by default.
#
#query_icmp off
# TAG: test_reachability on|off
# When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH
# instead of ICP_MISS if the target host is NOT in the ICMP
# database, or has a zero RTT.
#
#test_reachability off
# TAG: buffered_logs on|off
# Some log files (cache.log, useragent.log) are written with
# stdio functions, and as such they can be buffered or
# unbuffered. By default they will be unbuffered. Buffering them
# can speed up the writing slightly (though you are unlikely to
# need to worry).
#buffered_logs off
# TAG: reload_into_ims on|off
# When you enable this option, client no-cache or ``reload''
# requests will be changed to If-Modified-Since requests.
# Doing this VIOLATES the HTTP standard. Enabling this
# feature could make you liable for problems which it
# causes.
#
# see also refresh_pattern for a more selective approach.
#
#reload_into_ims off
# TAG: always_direct
# Usage: always_direct allow|deny [!]aclname ...
#
# Here you can use ACL elements to specify requests which should
# ALWAYS be forwarded directly to origin servers. For example,
# to always directly forward requests for local servers use
# something like:
#
# acl local-servers dstdomain my.domain.net
# always_direct allow local-servers
#
# To always forward FTP requests directly, use
#
# acl FTP proto FTP
# always_direct allow FTP
#
# NOTE: There is a similar, but opposite option named
# 'never_direct'. You need to be aware that "always_direct deny
# foo" is NOT the same thing as "never_direct allow foo". You
# may need to use a deny rule to exclude a more-specific case of
# some other rule. Example:
#
# acl local-external dstdomain external.foo.net
# acl local-servers dstdomain foo.net
# always_direct deny local-external
# always_direct allow local-servers
#
# This option replaces some v1.1 options such as local_domain
# and local_ip.
# TAG: never_direct
# Usage: never_direct allow|deny [!]aclname ...
#
# never_direct is the opposite of always_direct. Please read
# the description for always_direct if you have not already.
#
# With 'never_direct' you can use ACL elements to specify
# requests which should NEVER be forwarded directly to origin
# servers. For example, to force the use of a proxy for all
# requests, except those in your local domain use something like:
#
# acl local-servers dstdomain foo.net
# acl all src 0.0.0.0/0.0.0.0
# never_direct deny local-servers
# never_direct allow all
#
# or if squid is inside a firewall and there is local intranet
# servers inside the firewall then use something like:
#
# acl local-intranet dstdomain foo.net
# acl local-external dstdomain external.foo.net
# always_direct deny local-external
# always_direct allow local-intranet
# never_direct allow all
#
# This option replaces some v1.1 options such as inside_firewall
# and firewall_ip.
# TAG: fake_user_agent
# If you use the paranoid http_anonymizer setting, Squid will strip
# your User-agent string from the request. Some Web servers will
# refuse your request without a User-agent string. Use this to
# fake one up. For example:
#
# fake_user_agent Nutscrape/1.0 (CP/M; 8-bit)
# (credit to Paul Southworth pauls@etext.org for this one!)
#
#fake_user_agent none
# TAG: icon_directory
# Where the icons are stored. These are normally kept in
# /usr/local/squid/etc/icons
# TAG: error_directory
# If you wish to create your own versions of the default
# (English) error files, either to customise them to suit your
# language or company copy the template english files to anther
# directory and point this tag at them.
# TAG: minimum_retry_timeout (seconds)
# This specifies the minimum connect timeout, for when the
# connect timeout is reduced to compensate for the availability
# of multiple IP addresses.
#
# When a connection to a host is initiated, and that host has
# several IP addresses, the default connection timeout is reduced
# by dividing it by the number of addresses. So, a site with 15
# addresses would then have a timeout of 8 seconds for each
# address attempted. To avoid having the timeout reduced to the
# point where even a working host would not have a chance to
# respond, this setting is provided. The default, and the
# minimum value, is five seconds, and the maximum value is sixty
# seconds, or half of connect_timeout, whichever is greater and
# less than connect_timeout.
#
#minimum_retry_timeout 5 seconds
# TAG: maximum_single_addr_tries
# This sets the maximum number of connection attempts for a
# host that only has one address (for multiple-address hosts,
# each address is tried once).
#
# The default value is three tries, the (not recommended)
# maximum is 255 tries. A warning message will be generated
# if it is set to a value greater than ten.
#
#maximum_single_addr_tries 3
# TAG: snmp_port
# Squid can now serve statistics and status information via SNMP.
# By default it listens to port 3401 on the machine. If you don't
# wish to use SNMP, set this to '-1'.
#
# NOTE: SNMP support requires use the --enable-snmp configure
# command line option.
#snmp_port 3401
# TAG: snmp_do_queueing
# If disabled, snmp packets will not be queued but delivered
# immediately. This could be useful when you want to monitor a
# cache in trouble, but this could also make Squid block, slowing
# connections and possibly worsening the cache status.
#snmp_do_queueing on
# TAG: forward_snmpd_port
# This configures whether we should be forwarding SNMP requests
# to another snmpd. The reason for putting this piece of
# functionality into Squid was to enable access to the system's
# installed snmpd with minimal changes. This option is turned
# off by default, check with your /etc/services for your system's
# snmp port (usually 161). We do not use getservbyname() to
# allow you to set Squid into port 161 and your system's snmpd to
# another port by changing /etc/services.
#
# WARNING: Because of Squid acting as a proxy snmpd for system
# you have to do security checks on THIS snmpd for all objects.
# Check your snmp_config_file.
#forward_snmpd_port 0
# TAG: snmp_mib_path
# The location of Squid's mib.
#snmp_mib_path /usr/local/squid/etc/mib.txt
# TAG: trap_sink
# Hostname or ip address of trap sink for snmp
#trap_sink 127.0.0.1
# TAG: snmp_trap_community
# Community name for traps.
#snmp_trap_community public
# TAG: snmp_enable_authen_traps
# Enable SNMP authenticated traps. Set to 'off' or 'on'.
#snmp_enable_authen_traps off
# TAG: snmp_agent_conf
# Define snmp views, users and communities
# Example:
# snmp_agent_conf view all .1.3.6 included
# snmp_agent_conf view squid .1.3.6 included
# snmp_agent_conf user squid - all all public
# snmp_agent_conf user all all all all squid
# snmp_agent_conf community public squid squid
# snmp_agent_conf community readwrite all all
# TAG: snmp_acl
# Define access controls per community:
# snmp_access communityname allow|deny [!]aclname ...
# Example:
# snmp_acl public allow adminsubnet
# snmp_acl public deny all
# TAG: snmp_incoming_address
# TAG: snmp_outgoing_address
# Just like 'udp_incoming_address' above, but for the SNMP port.
#
# snmp_incoming_address is used for the SNMP socket receiving
# messages from SNMP agents.
# snmp_outgoing_address is used for SNMP packets returned to SNMP
# agents.
#
# The default behaviour is to not bind to any specific address.
#
# NOTE, snmp_incoming_address and snmp_outgoing_address can not have
# the same value since they both use port 3130.
#
#snmp_incoming_address 0.0.0.0
#snmp_outgoing_address 0.0.0.0
# TAG: as_whois_server
# WHOIS server to query for AS numbers. NOTE: AS numbers are
# queried only when Squid starts up, not for every request.
# DELAY POOL PARAMETERS (all require DELAY_POOLS compilation option)
# -----------------------------------------------------------------------------
#
# A general note on delay pools - the first matched delay pool is used,
# that is, if a request falls into class1 then it isn't checked for class2
# or class3 (and similarly a class2 request isn't checked for class3).
# TAG: delay_class1_access
# This is used to select what client requests are processed via
# the first ("class 1") delay pool. In this delay pool only the
# aggregate traffic allowance is configurable.
# TAG: delay_class2_access
# This is used to select what client requests are processed via
# the first ("class 2") delay pool. In this delay pool both the
# aggregate and per-host traffic allowance are configurable.
# There are 254 individual delay pools based on the last 8 bits
# of the client IP address (addresses ending in 0 and 255 are not
# permitted).
# TAG: delay_class3_access
# This is used to select what client requests are processed via
# the first ("class 3") delay pool. In this delay pool, the
# aggregate, network and per-host traffic allowance are
# configurable. There are 255 network delay pools based on the
# 17th to 24th bit of the client IP address (network 255 is not
# permitted), and individual delay pools based on the last 16
# bits of the client IP address (network 255 and hosts ending in
# 0 and 255 are not permitted).
# TAG: delay_class1_aggregate_restore (bps)
# The number of bytes per second added to the class 1 aggregate
# delay pool traffic allowance (-1 to disable the delay pool).
# TAG: delay_class1_aggregate_max (bytes)
# The maximum number of bytes which can be in the class 1
# aggregate delay pool traffic allowance.
# TAG: delay_class2_aggregate_restore (bps)
# The number of bytes per second added to the class 2 aggregate
# delay pool traffic allowance (-1 to disable the delay pool).
# TAG: delay_class2_aggregate_max (bytes)
# The maximum number of bytes which can be in the class 2
# aggregate delay pool traffic allowance.
# TAG: delay_class2_individual_restore (bps)
# The number of bytes per second added to the class 2 individual
# host delay pool traffic allowances (-1 to disable these delay
# pools).
# TAG: delay_class2_individual_max (bytes)
# The maximum number of bytes which can be in the class 2
# individual host delay pool traffic allowances.
# TAG: delay_class3_aggregate_restore (bps)
# The number of bytes per second added to the class 3 aggregate
# delay pool traffic allowance (-1 to disable the delay pool).
# TAG: delay_class3_aggregate_max (bytes)
# The maximum number of bytes which can be in the class 3
# aggregate delay pool traffic allowance.
# TAG: delay_class3_network_restore (bps)
# The number of bytes per second added to the class 3 8-bit
# network delay pool traffic allowances (-1 to disable these
# delay pools).
# TAG: delay_class3_network_max (bytes)
# The maximum number of bytes which can be in the class 3 8-bit
# network delay pool traffic allowances.
# TAG: delay_class3_individual_restore (bps)
# The number of bytes per second added to the class 3 individual
# host delay pool traffic allowances (-1 to disable these delay
# pools).
# TAG: delay_class3_individual_max (bytes)
# The maximum number of bytes which can be in the class 3
# individual host delay pool traffic allowances.
# TAG: incoming_icp_average
# TAG: incoming_http_average
# TAG: min_icp_poll_cnt
# TAG: min_http_poll_cnt
# Heavy voodoo here. I can't even beleve you are reading this.
# Are you crazy? Don't even think about adjusting these unless
# you understand the algorithms in comm_select.c first!
#
#incoming_icp_average 6
#incoming_http_average 4
#min_icp_poll_cnt 8
#min_http_poll_cnt 8
# TAG: max_open_disk_fds
# TAG: offline_mode
# Enable this option and Squid will never try to validate cached
# objects.
# TAG: uri_whitespace
# What to do with requests that have whitespace characters in the
# URI. Options:
#
# deny: The request is denied. The user receives an "Invalid
# Request" message.
# allow: The request is allowed and the URI is not changed. The
# whitespace characters remain in the URI. Note the
# whitespace is passed to redirector processes if they
# are in use.
# encode: The request is allowed and the whitespace characters are
# encoded according to RFC1738. This could be considered
# a violation of the HTTP/1.1
# RFC because proxies are not allowed to rewrite URI's.
# chop: The request is allowed and the URI is chopped at the
# first whitespace. This might also be considered a
# violation.
#uri_whitespace deny
# TAG: persistent_client_posts
# Turn this 'off' to disable persistent connections for POST
# requests. When you disable this, Squid reads all bytes
# from the client request and sends them to the server. This
# makes Squid work with broken HTTP servers which expect the
# additional CRLF pair from broken web clients.
#persistent_client_posts on
--==_Exmh_11592538600
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Received on Fri Dec 10 1999 - 16:05:02 MST
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