You might have subscribed for costly monitoring services, however, the following script will help you to keep a track of your site’s availability.
Create file /usr/sbin/monitor.php with the following contents.
#!/usr/bin/php -q <?php define ( “ TIMEOUT “ , 30 ) ; define ( “ EMAIL “ , ‘ yourname@yourdomain.com ‘ ) ; check ( “ http://domain1.com “ ) ; check ( “ http://domain2.com “ ) ; check ( “ http://domain3.com “ ) ; check ( “ http://domain4.com “ ) ; function check ( $url ){ $ch = curl_init () ; curl_setopt ( $ch , CURLOPT_RETURNTRANSFER , 1 ) ; // Return Page contents. curl_setopt ( $ch , CURLOPT_URL , $url ) ; curl_setopt ( $ch , CURLOPT_TIMEOUT , 30 ) ; curl_setopt ( $ch , CURLOPT_DNS_CACHE_TIMEOUT , TIMEOUT ) ; curl_setopt ( $ch , CURLOPT_CONNECTTIMEOUT , TIMEOUT ) ; curl_setopt ( $ch , CURLOPT_HEADER , TIMEOUT ) ; $result = curl_exec ( $ch ) ; curl_close ( $ch ) ; / HTTP/1.1 200 OK”) if ( strpos ( $result , “ 200 OK “ ) != 8 ){ mail ( EMAIL , “ Error in $url “ , $results ) ; } } ?>
Add this line in your Linux /etc/crontab or via cpanel to monitor eg: every 3 minutes
*/3 * * * * root /usr/sbin/monitor.php >> /dev/null 2>&1
Temporary connection issues or high load in the server may also trigger an alert.
