HowtoForge - Linux Howtos and Tutorials - Monitoring

How To Simulate Network Devices Using SNMP Simulator

Fri, 13 Apr 2012 16:11:28 +0200

How To Simulate Network Devices Using SNMP Simulator

This tutorial explains how you can simulate network devices for testing purposes with the free Verax SNMP Simulator. Verax SNMP agent simulator is a tool that can simulate multiple SNMPv1/v2c agents on a single host on standard 161 port through multi-netting. It allows IT personnel to build virtual, simulated networks of devices without purchasing any additional hardware, for instance for testing purposes. Individual simulated agent responses can be initially retrieved from existing devices and modified at runtime by user defined rules.

Server Monitoring With Icinga On Ubuntu 11.10

Thu, 29 Mar 2012 15:35:21 +0200

Server Monitoring With Icinga On Ubuntu 11.10

Server Monitoring With munin And monit On Debian Squeeze

Sun, 18 Mar 2012 20:59:27 +0100

Server Monitoring With munin And monit On Debian Squeeze

In this article I will describe how you can monitor your Debian Squeeze server with munin and monit. munin produces nifty little graphics about nearly every aspect of your server (load average, memory usage, CPU usage, MySQL throughput, eth0 traffic, etc.) without much configuration, whereas monit checks the availability of services like Apache, MySQL, Postfix and takes the appropriate action such as a restart if it finds a service is not behaving as expected. The combination of the two gives you full monitoring: graphics that lets you recognize current or upcoming problems, and a watchdog that ensures the availability of the monitored services.

Centralized RSYSLOG Server Monitoring

Wed, 15 Feb 2012 18:40:53 +0100

Centralized RSYSLOG Server Monitoring

This tutorial provides step-by-step instructions on how to install RSYSLOG server on Debian 6 (Squeeze) and how to send syslog data to it from multiple client servers. We will also show how to install an Apache webserver and a MySQL database server to gather the syslog data and how to install LogAnalyzer to easily browse the collected data with a web-browser.

Icinga Configuration For Nginx On Debian Wheezy/Ubuntu 11.10

Sun, 12 Feb 2012 20:33:37 +0100

Icinga Configuration For Nginx On Debian Wheezy/Ubuntu 11.10

Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. It is a fork of Nagios. This tutorial explains how to serve the Icinga Web interface from an nginx server on Debian Wheezy/Ubuntu 11.10 (the tutorial might work for Debian Squeeze as well but I didn't test; Squeeze's Icinga version is a lot older than the versions for Wheezy and Ubuntu 11.10, so there might be small differences).

How To Monitor And Manage IPMI Management Console

Wed, 04 Jan 2012 17:44:05 +0100

How To Monitor And Manage IPMI Management Console

This guide provides an overview on how to monitor and manage IPMI Management Console with Verax NMS. The Intelligent Platform Management Interface (IPMI) is a standardized computer system interface used by system administrators to manage a computer system and monitor its operation.

Server Monitoring With Icinga On Debian Squeeze

Tue, 23 Aug 2011 17:25:24 +0200

Server Monitoring With Icinga On Debian Squeeze

Monitoring ESX/ESXi Servers

Fri, 29 Jul 2011 12:27:41 +0200

Monitoring ESX/ESXi Servers

The purpose is to highlight the most important topics related to setting up ESX/ESXi monitoring as well as applications hosted within managed virtual machines (a MySQL database is used in this tutorial).

How To Automatically Shut Down Your Computer After A Download Finishes

Tue, 26 Apr 2011 11:01:50 +0200

How To Automatically Shut Down Your Computer After A Download Finishes

Sometimes you want to download something but don't want to wait until it finishes so you can shut down the computer. In this case you can use Sentinella.

Installing Nagios On Debian Lenny And Monitoring A Debian Lenny Server

Fri, 04 Mar 2011 17:13:23 +0100

Installing Nagios On Debian Lenny And Monitoring A Debian Lenny Server

Nagios is a monitoring solution for complex IT infrastructures, Nagios is easy to implement and can be extended by custom-modules, called plugins. In this howto I explain howto install Nagios on a Debian Lenny host and make the configuration for it. Furthermore we are going to install a second Debian machine which we monitor with remote and local plugins.

Easy RoundCube (Over SSL) And Webmin With fail2ban For ISPConfig 3 On Debian Squeeze

Wed, 02 Mar 2011 17:59:18 +0100

Easy RoundCube (Over SSL) And Webmin With fail2ban For ISPConfig 3 On Debian Squeeze

I prefer the RoundCube solution over the default in ISPConfig 3. I also find it useful to have the webmin installed in all my systems. In this post you can see a very fast way to have both of them installed, in companion with the great support of fail2ban. Finally I want to access all of them over SSL (even phpmyadmin -- see the tip in the end).

Nagios Installation On Ubuntu 10.04 (Lucid Lynx)

Fri, 18 Feb 2011 17:04:46 +0100

Nagios Installation On Ubuntu 10.04 (Lucid Lynx)

This tutorial shows how to set up Ubuntu Lucid Lynx (10.4) server with the Nagios Monitoring System. Nagios is a powerful, highly configurable monitoring and alarming system, which can monitor a wide variety of systems (network, server, daemons, applications). Monitoring could be done for instance for availability or utilization. The monitoring could be restricted to services which are connectable from the outside (e.g. a webserver on port 80/tcp), or with the help of NRPE (Nagios Remote Plugin Executor) plugins for testing could also be executed remote. We will be installing Nagios, Nagios Plugins, and Postfix with this tutorial. Postfix will be configured to send email via your alternate email server. This tutorial will only give you the basic configuration with Postfix, any additional settings can be found in multiple places on the Internet.

Installing Full-Featured Rsyslog 5.7.x On CentOS 5.x

Fri, 11 Feb 2011 16:00:04 +0100

Installing Full-Featured Rsyslog 5.7.x On CentOS 5.x

This tutorial shows how you can install new generation of syslog servers by using Rsyslog. According to Rsyslog web site (www.rsyslog.com), Rsyslog is an enhanced syslogd supporting, among others, MySQL, PostgreSQL, failover log destinations, syslog/tcp, fine grain output format control, high precision timestamps, queued operations and the ability to filter on any message part. It is quite compatible to stock sysklogd and can be used as a drop-in replacement. Its advanced features make it suitable for enterprise-class, encryption protected syslog relay chains while at the same time being very easy to setup for the novice user.

System Monitoring With sar And ksar

Wed, 26 Jan 2011 17:47:54 +0100

System Monitoring With sar And ksar

sar is one of the old and famous commandline utilities, which is often overlooked. It provides a wealth of information when you have kind of performance bottlenecks. By itself it only provides lengthy columns of numerical data, kind of hard to interpret. sar exists on most Linux distributions, for example Ubuntu, Debian, CentOS, Gentoo, and is also available on Solaris, AIX, and other commercial Unices. ksar, on the other hand, is a Java based front end for sar's numerical data. It produces friendly graphs which could be exported to .pdf and some other formats.

Icinga (Monitoring Solution) Installation And Configuration On CentOS

Wed, 19 Jan 2011 18:01:26 +0100

Icinga (Monitoring Solution) Installation And Configuration On CentOS

Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. Scalable and extensible, Icinga can monitor complex, large environments across dispersed locations.