We were developing a shopping cart application for a client using WordPress. During the development, we faced an occasional server not responding situation. So we wanted to monitor the availability of the Linux server.
After several hours of searching and exploring, we found several server monitoring solutions.
Follow this link for a detailed comparison
Zabbix was the obvious choice for us as we were seeking for an open-source monitoring solution. It was quite easy and could able to get online pretty soon. Just go through the installation instructions of Zabbix and get your servers monitored.