Before upgrading you should have a good backup of existing nagios installation and configuration files.If anything goes wrong,then this will allow you to rollback to your old version. Nagios upgrading don’t even need root access.We can do this as ‘nagios’ user. Become nagios user by su or sudo command su -l nagios Remove the following [...]

By using nagios we can monitor private services & attributes like Memory usage CPU load Disk usage Service stats Running processes etc Monitoring private services or attributes of a windows machine requires an agent on it.This agent act as a proxy between the nagios plug-in that does the monitoring and the actual service or attribute [...]