Download {{:unattended_installations:check_squid.pl.rar|}} 

    tar -zxvf check_squid.pl.rar

copy into the folder /usr/lib/nagios/plugins/

change the definition command for squid in /etc/nagios-plugins/config/http.cfg
    
    # 'check_squid' - tries to access an URL through proxy
    define command {
        command_name    check_squid
        command_line    $USER1$/check_squid.pl --proxy=$HOSTADDRESS$ --proxyport=$ARG1$ --proxyuser=$ARG2$ --proxypass=$ARG3$ --url=$ARG4$ --status=$ARG5$
        }

Define the service into the icinga or nagios server config file
	
     define service {
        service_description             squid
        use                             generic-service
        host_name                       proxy
        check_command                   check_squid!3128!squid!squid!http://www.google.com!200
       }