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Running SQUID in freeBSD

Running SQUID in freeBSD. Sufi Faruq Ibne Abubakar AKTEL, TMIB Bangladesh. What is Squid ? A full-featured Web proxy cache Designed to run on Unix systems Free, open-source software The result of many contributions by unpaid (and paid) volunteers Why will I use Squid?

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Running SQUID in freeBSD

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  1. RunningSQUIDinfreeBSD Sufi Faruq Ibne Abubakar AKTEL, TMIB Bangladesh

  2. What is Squid ? • A full-featured Web proxy cache • Designed to run on Unix systems • Free, open-source software • The result of many contributions by unpaid (and paid) volunteers Why will I use Squid? • Save 30% Internet Bandwidth • Access Control • Low cost proxy

  3. Proxy keeps database of each request comes from client • Proxy itself goes to get resource from internet to satisfy first time request • Proxy caches resources immediately after obtaining it from internet. • Proxy serves the resource from cache in second request for same resources

  4. Consideration for squid deployment • User calculation • System Memory (Min 256 MB RAM) • Speedy Storage (SCSI Preferred) • Faster CPU • Functionality expectations

  5. Squid Features • Proxying and caching of HTTP, FTP, and other URLs • Proxying for SSL • Cache hierarchies • ICP, HTCP, CARP, Cache Digests • Transparent caching • WCCP (Squid v2.3 and above) • Extensive access controls • HTTP server acceleration • SNMP • caching of DNS lookups • And many more..

  6. Obtaining Squid • Obtain package source from: • http://www.squid-cache.org • Squid Mirror Sites (http://www.squid-cache.org/Mirrors/http-mirrors.html) • Binary download for FreeBSD also available (http://www.squid-cache.org/binaries.html) • “STABLE” releases, suitable for production use • “PRE” releases, suitable for testing

  7. Installing Squid • tar zxvf squid-2.5.STABLE10.tar.gz • cd squid-2.5.STABLE10 • ./configure --enable-removal-policies --enable-delay-pools --enable-ipf-transparent --enable-snmp --enable-storeio=diskd,ufs --enable-storeio=diskd,ufs --disable-ident-lookups • make all • make install

  8. Configuring Squid • Edit the squid.conf file and populate it # vi /usr/local/squid/etc/squid.conf http_port 3128 cache_mem 16 MB cache_dir ufs /usr/local/squid/cache 15360 16 256 cache_replacement_policy lru acl all src 0.0.0.0/0.0.0.0 acl outgoing src 202.144.151.0/255.255.255.224 http_access allow outgoing http_access deny all

  9. Necessary File Permissions • Give the logfile directory ownership to squid user # chown -R nobody:nobody /usr/local/squid/var/logs • Give the cache directory ownership to squid user # mkdir /usr/local/squid/cache # chown -R nobody:nobody /usr/local/squid/cache # /usr/local/squid/sbin/squid –z • We consider “nobody” is the squid user here.

  10. Squid Startup Script# touch /usr/local/etc/rc.d/squid.sh # chmod 755 /usr/local/etc/rc.d/squid.sh #!/bin/sh echo -n ' Squid ' case "$1" in start) /usr/local/squid/sbin/squid -D ;; stop) /usr/local/squid/sbin/squid -k shutdown ;; restart) /usr/local/squid/sbin/squid -k reconfigure ;; *) echo "Usage: `basename $0` {start|stop|restart}" ;; esac

  11. Running Squid • Create cache dir and create swap # (/usr/local/squid/sbin/squid -z) • Configure Squid to start at boot # vi /etc/rc.conf (squid_enable=“YES”) • Run Squid using script # /usr/local/etc/rc.d/squid.sh start

  12. Advanced Features • --enable-delay-pools • Enable delay pools to limit bandwidth usage. • It will give fair bandwidth usage for everybody. • --enable-ipf-transparent • You need to use IP Filter to redirect traffic. • You don't have to configure the client's browser. • You can force the client to use the proxy every time. • --enable-storeio=diskd,ufs • Improve disk I/O performance up to 400 % (squid FAQ). • You might need to recompile the kernel to support message queues and shared memory (if not supported). • --enable-snmp • Enable SNMP to monitor squid performace. • SNMP enables you to monitor squid with mrtg or rrdtool.

  13. Configuring Transparent Proxy • Compile with --enable-ipf-transparent • Edit “squid.conf” to fiill with following options. http_port 3128 httpd_accel_host virtual httpd_accel_port 80 httpd_accel_with_proxy on httpd_accel_uses_host_header on • Edit “/etc/rc.conf” to enable ipfilter ipfilter_enable="YES" ipnat_enable="YES“ ipmon_enable="YES" ipfs_enable="YES“ • Edit /etc/ipnat.rules to add http traffic redirection rules. rl0 0/0 port 80 -> 127.0.0.1 port 3128 tcp

  14. Monitoring Squid Activities • cache_access_log • cache_store_log • cache_log Troubleshooting Squid • /var/log/messages

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