Currently viewing the category: "Monitoring"

CentOS: Install Nagios – The Simple Way

By On 11 April 2013 · Leave a Comment

Nagios is the most popular open-source infrastructure monitoring tools. Nagios offers monitoring and alerting for servers, switches, applications, and services. It alerts users when things go wrong and alerts them again when the problem has been resolved.

I have created a script to install Nagios and Nagious plugin in RHEL/CentOS:

#!/bin/bash # Install nagios and [...]

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CentOS 6: Install Remote Logging Server (rsyslog)

By On 8 January 2013 · Leave a Comment

In my office network, we have a lot of small devices like router and switches in our environment. My boss wants me to have a report on all of our network device for auditing purposes. To accomplish this objective, I need to have a server which run as logging server, accepting various type of logging [...]

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Install and Configure Zenoss as Centralized Monitoring System

By On 16 August 2012 · 3 Comments

Good system administrator should know that they need to do these 3 most important things after delivering a server:

secure monitor backup

As part of monitoring task, in this tutorial, I am going to show on how to build a centralized monitoring system using Zenoss. Zenoss will need to use SNMP agent in every server [...]

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Snmpd: Connection from UDP: REFUSED and SNMP Logging

By On 7 August 2012 · Leave a Comment

Connection from UDP: [IP]:[port] REFUSED

During setting up my monitoring system using Zenoss, I see some of the servers which run on RHEL 5 were returning following logs under /var/log/message :

Aug 2 10:47:55 server1 snmpd[30684]: Connection from UDP: [210.6.122.109]:56295 REFUSED Aug 2 10:47:57 server1 snmpd[30684]: Connection from UDP: [210.6.122.109]:56295 REFUSED

To solve this, we [...]

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cPanel: Trigger Alert from Munin

By On 27 March 2012 · 2 Comments

For cPanel servers, Munin is one of important plugin that need to be enabled in the server. cPanel has provide this plugin to be install with just one click under WHM > cPanel > Manage Plugins > Munin. We can monitor and understand what is going on with our server resources while predicting future problems [...]

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Web Server Benchmarking using Apache Benchmark and gnuplot

By On 15 March 2012 · Leave a Comment

Apache Benchmark (aka ab) is a tool to benchmark the HTTP web server. It is recommended to test your web server performance before switch it to production environment. I am using this tools to benchmark and do some stress test to our development server before it goes live.

Make sure you have following points prepared [...]

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