30 May, 2007
Overview
Nagios is an application that monitors any device on a network that is addressable. It is easily configured to monitor a servers availability on the network from just simple TCP/IP ping requests, to more advanced service monitors such as http, dns, and telnet. With plugins it can also monitor health status of devices such as CPU load, memory utilizaton and drive usage.
Before nagios can be configured it needs to be installed. That documentation can be found here: Nagios 2.6 Installation on Ubuntu 6.06 Linux
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Tags: linux, Nagios, ubuntuShare This
29 Mar, 2007
There are times when you may want to add a second or multiple IP addresses to your linux system. It’s fairly straightforward to add a sub-interface to your current configuration. In fact, it’s just as easy to add ten sub-interfaces as it is one.
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Tags: ip addresses, linux, multiple ip, ubuntuShare This
28 Mar, 2007
Nagios is an open source tool that monitors any device on a network that is IP addressable. I use it extensively on a daily basis at my workplace. It is easily configured to monitor a servers availability on the network from just simple TCP/IP ping requests, to more advanced service monitors such as http, dns, telnet, smtp and snmp. With additional plugins it can also monitor health status of devices such as CPU load, memory utilization and drive space consumption.This tutorial is created as a way for me to document the steps I took to install Nagios. There are many ways to install Nagios into a functional system, this just happens to be the way that I got it to work. If you are looking for an easy way to build your own Nagios server follow along and you’ll have your own running in no time.
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Tags: cpu load, linux, memory utilization, Nagios, service monitors, snmp, ubuntuShare This
20 Mar, 2007
Since I covered configuring DHCP Addressing for Ubuntu Linux yesterday, I figured it would be a good idea to post a quick article about assigning static IP addresses to your system. Often when you install Ubuntu on a network with a live DHCP server, it will not give you the chance to statically set your IP when you are installing. After the install it’s easy to go in and make the necessary changes.First there are a few decisions you need to make. You will need to decide what IP address, subnet mask, network id, broadcast address and gateway address you will be using on your system. It is beyond the scope of this article to help you caclulate the necessary settings. If there is enough demand, maybe I’ll write a TCP/IP subnetting tutorial.
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Tags: broadcast address, gateway address, linux, network id, static ip addresses, subnet mask, tcp ip, ubuntuShare This
19 Mar, 2007
Normally the network interface cards are configured during the installation of Linux. However, sometimes certain circumstances require you to change the addressing scheme of your system. This article will take you step by step through the process of configuring your system to use DHCP for obtaining its IP addressing information. Ubuntu has some very nice GUI tools to allow you to change your settings with the click of the mouse but this article will focus on how to make your changes from a command line in the event that you don’t have the GUI installed. Also, this tutorial is Ubuntu/Debian centric but the principles can be applied to many other Linux distributions, especially any that are based on Debian.
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Tags: dhcp, ip addressing, linux, nano, network interface cards, ubuntuShare This
13 Mar, 2007
PuTTY is an invaluable tool that I use nearly every day at work. The two main functions I use if for is telnetting into Cisco devices and secure shell access to remote Linux servers. It allows for the storing of host session information for easy recall. Another advantage is that it is a single executable file which makes it extremely portable. Just toss it on a memory stick and carry it with you in your pocket. The best part is that it’s free!
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Tags: linux, putty, secure shell, sshShare This
8 Mar, 2007
Secure Shell (SSH) is a protocol that uses encryption to create a secure channel from a local computer to a remote computer. It is primarily used to execute commands on a remote host via a terminal session. In addition, it allows for tunneling and file transfer. It’s a handy little tool that allows remote access with a fair sense of security. It’s very simple to install on Ubuntu with the Advanced Packaging Tool (APT).
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Tags: encryption, linux, secure shell, ssh, terminal session, ubuntuShare This
7 Mar, 2007
If you haven’t already heard, Because of The Energy Policy Act of 2005 Daylight Savings Time in the USA will start 3 weeks earlier at 2am on the second Sunday in March and end one week later at 2am on the first Sunday in November. It’s important that you check your current settings to make sure you don’t have any issues or get your time out of sync. Even if you have your time updated via NTP, you aren’t covered. NTP operates by setting your computer time to UTC or Universal Standard Time. Your computer then calculates the correct local time according to your time zone settings.
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Tags: daylight savings time, dst, linux, ntp, root, sudo, timezoneShare This
