Nagios, System and Network Monitoring. Open Source Press GmbH, first edition, ISBN: Laurent Andrey, Rémi Badonnel. An Introduction. Types of Monitoring. ○ Environmental. ○ Network Performance. ○ Application Performance. ○ Network Device Status. ○ Server / System Status. NETWORK MONITORING: Using Nagios as an Example Tool. Instructor. Männistö faults in the network by generating appropriate alert to notify the system ronaldweinland.info Accessed.
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Library of Congress Cataloging-in-Publication Data. Barth, Wolfgang. Nagios: system and network monitoring / Wolfgang Barth 1st ed. p. cm. Includes index. NAGIOS. Network Management &. Monitoring Periodically Nagios checks each service for each node . Nagios System and Network Monitoring, by. Nagios® is a system and network monitoring application. .. If you are installing Nagios on an operating system or Linux distribution that isn't listed above, read.
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After downloading the Nagios Core and Plugins tarballs, we created a Nagios user and user group before continuing the installation. The installation itself is not particularly complicated but requires issuing about 20 different commands plus manually updating a configuration file. In our view, this could have been greatly simplified by providing a script or an executable.
With the install and basic configuration completed, we proceeded to launch the Web interface.
On our initial log in, we were presented with a dashboard-type overview with a navigation menu to the left and a main screen on the right.
We were notified that our version 4. The home screen contains links to quick-start guides, videos, plugins and other resources.
Newbies will find this helpful when starting a new installation.
The Web interface provides a big-picture tactical-overview status screen that allows administrators to identify problems at a glance. To separate these variables from the NEB module that could be a bottleneck of the process, as standard ones, a name of a custom variable must begin with Nagios handles concurrent checks by forking, each Nexec an underscore.
For example, we could have an extra session works independently without blocking each other. At runtime this host in. Apart from service status, several network monitoring systems can also monitor the status obtained from SNMP.
Custom Modules enabling SNMP on the network device, we may collect some Another limitation of the Nagios core is that it does not internal information on such device e. Such information is usually load and the interface bandwidth. However, this network degradation and making a decision on the network method does not scale well. As for all network interfaces; we upgrade. The standard solution for storing performance data have to create several services associated with a big set of is to use NDOUtils which is a Nagios add-on consisting of a OIDs in order to obtain byte counts, operational status and stand-alone daemon and a NEB module.
NDOUtils allows us other important information. We solved this problem by to export the current status from one or more Nagios developing an all-in-one plug-in called Multiwalk using the instances to a MySQL database via TCP sockets. Therefore, we propose a different and ifOutOctets. This a plug-in broker named Nexec. Multiwalk all other actual plug-ins on behalf of the Nagios core process.
It When executed, Nexec returns the results gathered from the stores the results retrieved from SNMP directly to the actual plug-ins back to Nagios as well as storing the results to database to serve the user interface unit, while returning only the database.
Moreover, we can have the Nexec replaced our status summarization back to the Nagios core.
For Another module that needs to be worked around is the Figure 2. The Nexec work flow.
Nagios host check mechanism. For the flexibility reason, one could have a web server that is intentionally configured Nagios allows administrators to decide their own ways to to ignore ICMP echo request. If the administrator mistakenly check for the availability of hosts. This status can be obtained using a the Host Detail section. However, this method does report, he will see that HTTP service of that host is still not always work because there are a number of hosts in real showing UP which means that the host is not really DOWN.
Nevertheless, such hosts In reality, this does not matter for Nagios as it provides two will usually respond to some other actions, for example, it alternating views which assume that an administrator must may reply to a TCP SYN packet at some specific ports.
In understand the meaning of their conflict. Therefore we define our own status configuration may be a better choice.
Because of this reason, scheme according to the following diagram. If that host replies to any one of these methods we would know that the host is still online.
This property is primarily designed for providing the notification escalation mechanism that prevents Nagios from firing too many redundant alerts. Such relationship is also used to generate a network map displayed in the web interface.
Nagios offers two basic Figure 3. The host status coloring scheme. The topology generated by Nagios is a static picture of host With this simple scheme, users could understand at a relationship without dynamic status information. In the worst case it will display a at every moment. In addition to the parent-child linkages, red mark which means that such host is completely other attributes of hosts and services, such as current status, inaccessible in any way.
In addition, users should be able to re-adjust Nagios provides a diagram. One can achieve this by implementing an external user Being parent and child means that there is a communication interface module, such as a flash component, to represent medium joining them together.
However, Nagios treats such such information. We can easily obtain the information of connection as a logical link without any other information.
However, in our This is the configuration cache file that Nagios generates new system, we make use of interface operational status every time the core engine is restarted. Moreover, the status obtained from Multiwalk in order to build up a tangible link of all hosts and services check can be found in the file to illustrate a physical medium.
We use the status of the status. By combining interface at each end to represent half of the link status. This these two sources together, it is sufficient to build up the means that when the physical network cable is cut off, while whole network topology with the current operational status. Nagios always shows the link in black as usual, our topology The typical Nagios UI displays service and host checks in map will show a red line indicating that there is a problem on two separate reports i.
Nagios service status could be one of the following There is still one more challenging problem on the link state: OK, Warning, Critical, Unknown, while the host status visualization issue. In order to Nagios is uniquely defined on a pair of hosts, if we take this merge all this information on a single topology map, we need into consideration, there will be at most one link between any to do something different to avoid confusion.
For example, pair of two hosts. We usually IV. Therefore, the parent-child We have developed the prototype called NetHAM  relationship alone is obviously not enough to represent which stands for Network Health Analysis and Monitoring.
We extend the system by We use Nagios as a core module of our new system as it is building an external storage to memorize interface paring. The monitoring part contains the tree structure, the topology display and the in-depth status panel. Figure 4.
NetHAM configuration interface. Figure 5. NetHAM monitoring interface. The second part is the configuration setup which has been To increase interactivity of the component, we developed developed using parts of the open-source web-based our own XML parsing method and design the whole new configuration management called NagiosQL.
Instead of XML structure to represent a network topology together with writing configuration files, all Nagios configurations will be other important information such as device positions, device represented in the form of database entries. Whenever icons, link labels and link colors. In addition, to increase the configuration reloading is needed, the system will regenerate performance of the node placement algorithm, we all configuration files according to the entries in the database transformed the direct-sum calculation of the force-directed and force the Nagios core to restart.
The book was published in September, Thanks to Claire Connelly for bringing this to my attention. The book was published in August, Thanks to Marco Ramos for bringing this to my attention.
Published in June of Looking for something to read? We have plenty. Check out these Nagios publications and gain advanced insight into configuration methods and advanced features of Nagios.
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