Paul Chilton electronics, programming, server administration

Squid: Transparent Cache

This is my step by step instructions for how I setup Ubuntu server as a transparent Squid web cache.

Note: This post is by no means a definative guide on setting up a server, or squid, but is just the steps I took in getting it working in its most basic form.

• Install Ubuntu Server 9.10
• Logon to the server and login as root
  • "sudo su"

• Install packages
  • "apt-get update"
  • "apt-get -y install openssh-server"
  • "apt-get -y install nano"
  • "apt-get -y install squid"
• Setup Squid
  • "nano /etc/squid/squid.conf"
    • Uncomment http_access localnet line
    • Find line http_port 3128 and add transparent to it
• Restart Squid
  • "cd /etc/init.d/"
  • "squid -k kill"
  • "squid"
• Restart Network Interfaces
  • "/etc/init.d/networking restart"
• Enable IP forwarding
  • "echo "1" > /proc/sys/net/ipv4/ip_forward"
  • "nano /etc/sysctl.conf"
    • Set net.ipv4.conf.forwarding=1
• NAT setup
  • "modprobe iptable_nat"
  • "iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE"
• Add forwarding rules for squid
  • "iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128"
• Save iptables config
  • "iptables-save > /etc/iptables.conf"
• Install calamaris squid log analizer
  • "apt-get install calamaris"
  • "/usr/bin/calamaris -a -F html /var/log/squid/access.log > /usr/index.html"