Installation of squid practical session

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Installation of squid- practical session -
Tamás Máray ltmaray_at_fsz.bme.hugt 2nd DESIRE II Web
Cache Managers Workshop 2-3 March 2000, Budapest,
HUNGARY
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The lab

• Dual Pentium 350 PCs
• 9 GB HDD, 128M RAM, FastEthernet interface
• Cisco 2948 switch
• Linux (RedHat 6.1)
• gcc, perl, make, etc.
• ssh, lynx, netscape, etc.
• /usr/local and /home are shared (NFS)
• Domain hpcc.sztaki.hu
• Hostnames n1 ... n28 (workstations)
• n0 is the file server and "firewall"

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Connecting your laptop(only if you cant live
without it!)

• There are no free UTP connectors
• Laptops can be attached to the network in place
  of PC-s
• Use the IP address of the detached PC
• Default GW 193.224.187.129
• DNS server 193.225.86.1
• Subnet mask 255.255.255.192
• Your domain name is any of nX.hpcc.sztaki.hu
• where X is 1..28

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What is squid?

• squid is an Internet object cache software
• it runs on UNIX
• it is free
• it is versatile, well configurable
• it can be used for building cache systems
• meshes, hierarchies
• it performs well on cheap hardware
• it is very popular and it has good references
• JANET, SURFNET, DFN, SWITCH, and more

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The linux accounts

• Student accounts have been created
• Yellow pages is used
• use yppasswd when changing password
• login names stud01 - stud24
• Initial passwords login name x eg. stud01x
• Distribution of accounts
• Use studN where N is the number of the PC you sit
  at first time (in two digits, ie. 01-24)

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Installation of squid

• Steps
• 1. download the source to your HOME/squid
  directory
• You can find it here
• /usr/local/workshop/squid-2.3.STABLE1-src.tar.gz
• 2. unpack the package
• tar or gunziptar
• 3. cd to squid-2.3.STABLE1
• 4. look around, read README, INSTALL at least

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Installation of squid (cont.)

• 5. compile the source
• - configure
• ./configure --prefixHOME/squidrun
• - make all
• - make install
• 6. cd HOME/squidrun
• 7. look around, look into the directories,
  identify the components
• 8. cd HOME/squidrun/etc

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Installation of squid (cont.)

• 9. edit squid.conf
• - This is the only configuration file of squid
• - First we want a single, independent cache
• no parents, no siblings, no specialities
• - You must edit at least the following variables
• cache_mgr
• http_access
• visible_hostname
• - Review the other variables
• It takes time, the squid.conf file is long!

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Running squid

• 1. First, you must initialize the cache swap
  space
• HOME/squidrun/bin/squid -z
• creating hundreds of dirs may take a while...
• 2. Start your cache
• HOME/squidrun/bin/squid
• 3. Check your squid processes (2) with ps
• 4. Check your cache logfile in
• HOME/squidrun/logs/cache.log

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Using squid

• Configure netscape (or lynx) to use your cache
• port no. 3128
• Generate some traffic, surf the web
• Watch the logfiles
• HOME/squidrun/logs/.log
• Play with the configuration, change squid.conf
• Restart your cache
• send HUP signal to your squid
• (HOME/squidrun/logs/squid.pid

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Using squid

• Check and use the WWW cache manager interface
• Don't forget to set the access rights in
  squid.conf
• Try to use other caches
• Follow the instructions, try to build and
  participate in a cache mesh, having parent and
  sibling caches
• Play with your cache toy!

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A possible cache hierarchy
cache.sztaki.hu
parent
n1
n2
n3
siblings
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References

• http//www.squid-cache.org/
• http//www.squid-cache.org/Doc
• http//www.squid-cache.org/Doc/FAQ
• HAVE A NICE TIME
• AND GOOD LUNCH