Can the free server monitoring software nagios monitor traffic, databases, ports, and processes?

Nagios is an open source free network monitoring tool that can effectively monitor the host status of Windows, Linux and Unix, network settings such as switches and routers, printers, etc.

The functions that Nagios can monitor are:

1. Monitor network services (SMTP, POP3, HTTP, NNTP, PING, etc.); 2. Monitor host resources (processor load, disk Utilization, etc.);

3. Simple plug-in design allows users to easily expand their own service detection methods;

4. Parallel service inspection mechanism;

5. Have the ability to define the network hierarchical structure, and use "parent" host definition to express the relationship between network hosts. This relationship can be used to discover and clarify host downtime or unreachable status;

6. When service or host problems occur and are resolved, alarms will be sent to contacts (via EMail, SMS, user-defined methods);

7. It has the function of defining event handlers, which can be used on the host or service Get more problem location when events occur;

8. Automatic log rollback;

9. Can support and implement redundant monitoring of hosts;

10. The optional WEB interface is used to view the current network status, notification and fault history, log files, etc.;