Como instalar SQUID en centos

Squid es un popular programa de software libre que implementa un servidor proxy y un demonio para caché de páginas web, publicado bajo licencia GPL. Tiene una amplia variedad de utilidades, desde acelerar un servidor web, guardando en caché peticiones repetidas a DNS y otras búsquedas para un grupo de gente que comparte recursos de la red, hasta caché de web, además de añadir seguridad filtrando el tráfico. Está especialmente diseñado para ejecutarse bajo entornos tipo Unix.

Squid ha sido desarrollado durante muchos años y se le considera muy completo y robusto. Aunque orientado a principalmente a HTTP y FTP es compatible con otros protocolos como Internet Gopher. Implementa varias modalidades de cifrado como TLS, SSL, y HTTPS.

Instalacion via yum:

# yum install squid


Squid Basic Configuration

Squid configuration file located at /etc/squid/squid.conf. Open file using a text editor:
# vi /etc/squid/squid.conf
At least you need to define ACL (access control list) to work with squid. The defaults port is TCP 3128. Following example ACL allowing access from your local networks 192.168.1.0/24 and 192.168.2.0/24. Make sure you adapt to list your internal IP networks from where browsing should be allowed:
acl our_networks src 192.168.1.0/24 192.168.2.0/24
http_access allow our_networks

Save and close the file. Start squid proxy server:
# chkconfig squid on
# /etc/init.d/squid start

Output:

init_cache_dir /var/spool/squid... Starting squid: .       [  OK  ]

Verify port 3128 is open:
# netstat -tulpn | grep 3128
Output:

tcp        0      0 0.0.0.0:3128                0.0.0.0:*                   LISTEN      20653/(squid)

Open TCP port 3128

Finally make sure iptables is allowing to access squid proxy server. Just open /etc/sysconfig/iptables file:
# vi /etc/sysconfig/iptables
Append configuration:
-A RH-Firewall-1-INPUT -m state --state NEW,ESTABLISHED,RELATED -m tcp -p tcp --dport 3128 -j ACCEPT
Restart iptables based firewall:
# /etc/init.d/iptables restart
Output:

Flushing firewall rules:                                   [  OK  ]
Setting chains to policy ACCEPT: filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: [ OK ]
Loading additional iptables modules: ip_conntrack_netbios_n[ OK ]

Client configuration

Open a webbrowser > Tools > Internet option > Network settings > and setup Squid server IP address and port # 3128.

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