If you have linux servers, you need to know if they are working correctly and if they fail for some reason, you have to know about this failure before you clients get affected.
With nagios, you can monitor all your servers and services to be the first to know when something fails. This way you can take measures really fast and solve the problem even before your client realises.
In case of failure, you will get an email notification.
By default the following services will be monitored on each linux server: CPU load, ftp, http, mail, mysql and disk partitions.
More services can be added on demand, let me know what you need.
Get in touch with me before you order so we can agree on the price depending on how many servers you have and my availability as this is a big and complex project.