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Install SQUID with Dellay Pool

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Installing Squid with the delay pools feature

As I mentioned before, Squid has a feature called delay pools, which allows us to control download bandwidth. Unfortunately, in most distributions, Squid is shipped without that feature.
So if you have Squid already installed, I must disappoint you — you need to uninstall it and do it once again with delay pools enabled in the way I explain below.
  1. To get maximum performance from our Squid proxy, it’s best to create a separate partition for its cache, called /cache/. Its size should be about 300 megabytes, depending on our needs.If you don’t know how to make a separate partition, you can create the /cache/ directory on a main partition, but Squid performance can suffer a bit.

  2. We add a safe ‘squid’ user:# useradd -d /cache/ -r -s /dev/null squid >/dev/null 2>&1
    No one can log in as squid, including root.

  3. We download Squid sources from http://www.squid-cache.orgWhen I was writing this HOWTO, the latest version was Squid 2.4 stable 1:

  4. We unpack everything to /var/tmp:

  5. # tar xzpf squid-2.4.STABLE1-src.tar.gz

  6. We compile and install Squid (everthing is in one line):# ./configure --prefix=/opt/squid --exec-prefix=/opt/squid --enable-delay-pools --enable-cache-digests --enable-poll --disable-ident-lookups --enable-truncate --enable-removal-policies
    # make all
    # make install


Configuring Squid to use the delay pools feature

  1. Configure our squid.conf file (located under /opt/squid/etc/squid.conf):


    #squid.conf

    #Every option in this file is very well documented in the original squid.conf file

    #and on http://www.visolve.com/squidman/Configuration%20Guide.html



    #

    #The ports our Squid will listen on

    http_port 8080

    icp_port 3130

    #cgi-bins will not be cached

    acl QUERY urlpath_regex cgi-bin ?

    no_cache deny QUERY

    #Memory the Squid will use. Well, Squid will use far more than that.

    cache_mem 16 MB

    #250 means that Squid will use 250 megabytes of disk space

    cache_dir ufs /proxy 250 16 256

    redirect_rewrites_host_header off

    cache_replacement_policy GDSF

    acl localnet src 192.168.1.0/255.255.255.0

    acl localhost src 127.0.0.1/255.255.255.255

    acl Safe_ports port 80 443 210 119 70 21 1025-65535

    acl CONNECT method CONNECT

    acl all src 0.0.0.0/0.0.0.0

    http_access allow localnet

    http_access allow localhost

    http_access deny !Safe_ports

    http_access deny CONNECT

    http_access deny all

    maximum_object_size 3000 KB

    store_avg_object_size 50 KB



    #all our LAN users will be seen by external servers

    #as if they all use Mozilla on Linux :)

    anonymize_headers deny User-Agent

    fake_user_agent Mozilla/5.0 (X11; U; Linux 2.4.4 i686)



    #To make our connection even faster, we put a line similar

    #to the one below. Don't forget to change the server to your closest!

    #Measure pings, traceroutes and so on.

    #Make sure that http and icp ports are correct

    #cache_peer w3cache.icm.edu.pl parent 8080 3130 no-digest default



    #This is useful when we want to use the Cache Manager

    #copy cachemgr.cgi to cgi-bin of your www server

    cache_mgr your@email

    cachemgr_passwd secret_password all



    #This is a name of a user our Squid will work as

    cache_effective_user squid

    cache_effective_group squid



    log_icp_queries off

    buffered_logs on



    #####DELAY POOLS

    #This is the most important part for shaping incoming traffic with Squid

    #For detailed description see squid.conf file or docs at

    #http://www.squid-cache.org



    #We don't want to limit downloads on our local network

    acl magic_words1 url_regex -i 192.168



    #We want to limit downloads of these type of files

    #Put this all in one line

    acl magic_words2 url_regex -i ftp .exe .mp3 .vqf .tar.gz

    .gz .rpm .zip .rar .avi .mpeg .mpe .mpg .qt .ram .rm .iso .raw .wav

    #We don't block .html, .gif, .jpg and similar files, because they

    #generally don't consume much bandwidth



    #We have two different delay_pools

    delay_pools 2



    #First delay pool

    #W don't want to delay our local traffic

    #There are three pool classes; here we will deal only with the second

    delay_class 1 2



    #-1/-1 mean that there are no limits

    delay_parameters 1 -1/-1 -1/-1



    #magic_words1: 192.168

    delay_access 1 allow magic_words1



    #Second delay pool

    #we want to delay downloading files mentioned in magic_words2

    delay_class 2 2



    #The numbers here are values in bytes;

    #we must remember that Squid doesn't consider start/stop bits

    #6000/150000 are values for the whole network

    #5000/150000 are values for the single IP

    #after downloaded files exceed about 150000 bytes,

    #they will continue to download at about 5000 bytes/s



    delay_parameters 2 6000/150000 5000/150000

    delay_access 2 allow magic_words2



    #EOF
    OK, when we have configured everything, we must make sure everything under /opt/squid and /cache directories belongs to user ‘squid’.
    # chown -R squid:squid /opt/squid/
    # chown -R squid:squid /cache/
    or
    # chown -R squid.squid /opt/squid/
    # chown -R squid.squid /cache/
    Now everything is ready to run Squid. When we do it for the first time, we have to create its cache directories:
    # /opt/squid/usr/bin/squid -z
    We run Squid and check if everything is working. A good tool to do that is IPTraf; you can find it onhttp://freshmeat.net. Make sure you have set the appropriate proxy in your web browsers (192.168.1.1, port 8080 in our example):
    # /opt/squid/usr/bin/squid
    If everything is working, we add /opt/squid/usr/bin/squid line to the end of our initializing scripts. Usually, it can be/etc/rc.d/rc.local.
    Other helpful options in Squid may be:
    # /opt/squid/usr/bin/squid -k reconfigure (it reconfigures Squid if we made any changes in its squid.conf file)
    # /opt/squid/usr/bin/squid -help :) self-explanatory
    You can also copy cachemgr.cgi to the cgi-bin directory of your WWW server.




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