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Measuring the performance/latency of OpenSuse system - LatencyTOP

Post date: February 17, 2009, 08:02 Category: Optimizing Views: 4804 Comments
Tutorial quote: Skipping audio, slower servers, everyone knows the symptoms of latency. But to know what's going on in the system, what's causing the latency, how to fix it... that's a hard question without good answers right now.

LatencyTOP is a Linux* tool for software developers (both kernel and userspace), aimed at identifying where in the system latency is happening, and what kind of operation/action is causing the latency to happen so that the code can be changed to avoid the worst latency hiccups.

Tripwire on your Fedora Box

Post date: April 16, 2005, 00:04 Category: Security Views: 4870 Comments
Tutorial quote: Tripwire is an Intrusion Detection System. This can be used to alert users whenever their system is compromised. Tripwire detects and reports changes in system files. It will alert you through email whenever a change is detected. If the change is due to normal system activity, you can instruct Tripwire not to report the change to that file in future. If the change is not due to normal system activity, then it is a clear indication that something is wrong and you need to act immediately and fix the issue. Thus tripwire comes very handy to maintain the integrity of the system.

There is lot of information on the web about Tripwire. Some people might argue that AIDE (Advanced Intrusion Detection Environment) is better than tripwire and so on. This comparison is beyond the scope of this article. This is an introductory article for novice users who are interested in installing Tripwire on their Fedora Box. Advanced users can refer to the web for relevant information or they can contact appropriate mailing lists like fedora users mailing list.

Mastering the Enterprise Volume Management System

Post date: April 13, 2005, 19:04 Category: System Views: 2674 Comments
Tutorial quote: The Enterprise Volume Management System, or EVMS, is a disk, partition, and file system manager for Linux that claims to be a comprehensive tool for all disk management tasks. I ran across EVMS and found the idea appealing, so I decided to try it out. I've been working with it for a couple of weeks now, and this article describes what I found.

Creating A Fully Encrypted Para-Virtualised Xen Guest System Using Debian Lenny

Post date: May 3, 2009, 10:05 Category: Miscellaneous Views: 3378 Comments
Tutorial quote: This document explains how to set up a fully encrypted para-virtualized XEN instance. In this howto, the host system is running Debian Etch, while the guest system to be installed will be using Debian Lenny. If you are concerned about your privacy, you might want to consider using hard disk encryption to protect your valuable private data from spying eyes. Usually, the easiest way would be to use your distribution's installer to set up a fully encrypted system; I think most recent Linux distributions support this. However, when you are using XEN to provide virtualization, there are situations where you might not want to encrypt your whole computer with all guest instances, but instead only encrypt one OS instance. This howto will deal with exactly this situation. It assumes that the XEN host system is already up and running.

How To Install VMware Server On A Ubuntu 6.06 LTS (Dapper Drake) System

Post date: July 16, 2006, 16:07 Category: Software Views: 3321 Comments
Tutorial quote: This tutorial provides step-by-step instructions on how to install the free VMware Server (version 1.0.0) on a Ubuntu 6.06 LTS (Dapper Drake) system.

VMware has just released version 1.0.0 of its free VMware Server. With VMware Server you can create and run guest operating systems ("virtual machines") such as Linux, Windows, FreeBSD, etc. under a host operating system. This has the benefit that you can run multiple operating systems on the same hardware which saves a lot of money, and you can move virtual machines from one VMware Server to the next one (or to a system that has the VMware Player which is also free). In this article we use Ubuntu 6.06 LTS (Dapper Drake) as the host operating system.

I want to say first that this is not the only way of setting up such a system. There are many ways of achieving this goal but this is the way I take. I do not issue any guarantee that this will work for you!

How to configure Linux as Internet Gateway for small office

Post date: February 17, 2009, 08:02 Category: Network Views: 5364 Comments
Tutorial quote: This tutorial shows how to set up network-address-translation (NAT) on a Linux system with iptables rules so that the system can act as a gateway and provide internet access to multiple hosts on a local network using a single public IP address. This is achieved by rewriting the source and/or destination addresses of IP packets as they pass through the NAT system.

Giving your Xen instances a working X setup

Post date: January 3, 2006, 04:01 Category: Software Views: 2625 Comments
Tutorial quote: Xen, the virtualisation system, is a great tool for running fresh copies of an operating system. However it doesn't allow you to run X11 programs. Here we can fix that with the help of VNC.

Using the 'snort' Intrusion Detection System

Post date: December 27, 2005, 15:12 Category: Security Views: 4709 Comments
Tutorial quote: Snort is the leading open source Network Intrusion Detection System and is a valuable addition to the security framework at any site. Even if you are employing lots of preventative measures, such as firewalling, patching, etc., a detection system can give you an assurance that your defences truly are effective, or if not, will give you valuable information about what you need to improve.

Fortunately, there is a good set of snort packages for Debian which takes a lot of the tedious work out of building a useful Network Intrusion Detection System. Before we start on installation, we should review a few details about the networking satack that you're going to need to make sense of the alerts snort will generate. Impatient readers and those who are familiar with the TCP/IP suite of protocols may do now skip to the bit that says Stand alone snort.

Write your own kernel module and insert it into running kernel

Post date: January 12, 2009, 08:01 Category: Programming Views: 4482 Comments
Tutorial quote: So, you want to write a kernel module. You know C, you've written a few normal programs to run as processes, and now you want to get to where the real action is, to where a single wild pointer can wipe out your file system and a core dump means a reboot.

kernel Modules are pieces of code that can be loaded and unloaded into the kernel upon demand. They extend the functionality of the kernel without the need to reboot the system. For example, one type of module is the device driver, which allows the kernel to access hardware connected to the system.

Setting up a serial console

Post date: February 19, 2007, 19:02 Category: Miscellaneous Views: 3471 Comments
Tutorial quote: This tutorial will show you how to set up a serial console on a Linux system, and connect to it via a null modem cable. This is quite useful if your Linux server is in a headless configuration (no keyboard or monitor), as it allows you to easily get a console on the system if there are any problems with it (especially network problems, when SSH is not available). In the end, the GRUB menu will appear over the serial link, as will the bootup messages (output when booting the system). I am using Debian Etch on the server and Ubuntu Edgy on my client, although this should work on any Linux distribution.
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