Nagios monitoring network server and network service concepts

NagiosThe function is very powerful. For more information, see http://www.nagios.org. Now I will reference a piece of text to summarize what nagios is:

What is nagios?

Nagios is an application that monitors systems and networks. It monitors your specified host and service and issues a warning when the monitored content gets better or worse. Nagios was initially designed to run on the Linux platform, but now it works well on other platforms.

Nagios works as follows:

Nagios includes active and passive monitoring. The active check is to send a request through the host in the monitoring center, so that the nrpe daemon running on the remote host collects information and reports it. It displays the data on the page through the web interface.

Passive monitoring: When the remote host is in the firewall, only the remote host can access the monitoring center, and another monitoring center can be set in the firewall, after the nagios node of the Remote Monitoring Center collects server information, and the nsca Report, The naca client reports the server side of the naca node, then reports the nagios node of the monitoring center, and displays the monitoring result through the web interface.

Features of nagios include:

Monitors network services such as SMTP, POP3, HTTP, NNTP, and PING)

Monitors host resource processor loads, disk space, and so on)

Allow users to develop their own plug-ins to check custom projects;

By using the "parent host", you can define the layer of the network host to allow the probe host to go down or be inaccessible.

You can define how to handle and solve an event after the event occurs during the running of the host or service;

Automatically record error logs;

Support for redundancy monitoring;

Optional web interfaces. You can view the current network status, fault history, log files, and other information on the web page;

Nagios system requirements:

Linux, Unix, etc.

Apache

More than 1.63 of the GD database)

Zlib

Pnglib

Jpeglib

Basic icons

Among them, apache has been installed in related articles in the blog, just search for it; gd, zlib, pnglib and jpeglib installation is relatively simple, steps:

Download tarball

Tar zxvf xxx.tar.gz

Cd xxx

./Configure

Make & make install

Nagios can comprehensively monitor servers, including the status of apache, mysql, ntp, dns, disk, qmail, and sshd services, server status up and down, etc ). Through the introduction of nagios, we should have a certain understanding of it. Let's take a look at how nagios is installed and how network servers and network services are implemented, read installation, troubleshooting, and configuration.