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Debian

Setting Up A Highly Available NFS Server

Post date: April 1, 2006, 05:04 Category: Network Views: 6262 Comments
Tutorial quote: In this tutorial I will describe how to set up a highly available NFS server that can be used as storage solution for other high-availability services like, for example, a cluster of web servers that are being loadbalanced. If you have a web server cluster with two or more nodes that serve the same web site(s), than these nodes must access the same pool of data so that every node serves the same data, no matter if the loadbalancer directs the user to node 1 or node n. This can be achieved with an NFS share on an NFS server that all web server nodes (the NFS clients) can access.

As we do not want the NFS server to become another "Single Point of Failure", we have to make it highly available. In fact, in this tutorial I will create two NFS servers that mirror their data to each other in realtime using DRBD and that monitor each other using heartbeat, and if one NFS server fails, the other takes over silently. To the outside (e.g. the web server nodes) these two NFS servers will appear as a single NFS server.

In this setup I will use Debian Sarge (3.1) for the two NFS servers as well as for the NFS client (which represents a node of the web server cluster).
Debian

How to Obtain the Dell/HP Server (May be other vendors) service tag in Debian

Post date: October 26, 2008, 19:10 Category: System Views: 2888 Comments
Tutorial quote: You are using debian on Dell or HP servers if you want to know the serialnumber and model you can use the following procedure.This is verr useful when you are connected remotely and find the details.

Dump Desktop Management Interface data.The Desktop Management Interface provides a standardized description of
a computer’s hardware, including characteristics such as BIOS serial number and hardware connectors. dmidecode provides a dump of the DMI data available from the BIOS. It is used as a back-end tool by other hardware detection programs.
Solaris

Restoring a Sun system using JumpStart technology

Post date: April 13, 2005, 05:04 Category: Installing Views: 3920 Comments
Tutorial quote: If a server crash and the file systems are corrupted or totally destroyed, then the only way to recover the data is to restore from backups. If it is only user data that is corrupted, the task is in general simple, but if the system disk fails, then there is a little bit more work involved in order to to recover the system. This article explains how to backup Sun systems using ufsrestore over NFS, and how to use Sun's JumpStart technology to restore Sun servers and workstations over the network.
Linux

Setting Up A Subversion Repository Using Apache, With Auto Updatable Working Copy

Post date: June 19, 2007, 02:06 Category: Miscellaneous Views: 3047 Comments
Tutorial quote: Subversion is a free/open-source version control system. That is, Subversion manages files and directories over time. A tree of files is placed into a central repository. The repository is much like an ordinary file server, except that it remembers every change ever made to your files and directories. This allows you to recover older versions of your data, or examine the history of how your data changed. In this regard, many people think of a version control system as a sort of time machine.
Fedora

How To Run Fully-Virtualized Guests (HVM) With Xen 3.2 On Debian Lenny (x86_64)

Post date: March 8, 2009, 13:03 Category: Installing Views: 3903 Comments
Tutorial quote: This guide explains how you can set up fully-virtualized guests (HVM) with Xen 3.2 on a Debian Lenny x86_64 host system. HVM stands for HardwareVirtualMachine; to set up such guests, you need a CPU that supports hardware virtualization (Intel VT or AMD-V). Hardware virtualization allows you to install unmodified guest systems (in contrast to paravirtualization where the guest kernel needs to be modified); that way you cannot only virtualize OpenSource operating systems like Linux and BSD, but also closed-source operating systems like Windows where you cannot modify the kernel.
Debian

Installing Debian Etch From A Windows System With

Post date: September 27, 2007, 10:09 Category: Installing Views: 3100 Comments
Tutorial quote: Debian-Installer Loader is a Debian Etch installer for Windows which adds an entry to the boot menu that allows you to start the Debian installation. Unlike the Ubuntu installation with Wubi, real Debian partitions are created during the installation. In the end, you have a dual-boot system (Windows/Debian).
Linux

Automating the Login Script

Post date: April 17, 2005, 10:04 Category: Miscellaneous Views: 2458 Comments
Tutorial quote: In a perfect world, you could spend a few weeks creating a system and the result would be a system that never required manual maintenance or modifications. Whether this ideal will ever be achieved is debatable, but it definitely won't happen in the near future. In the meantime, we still have to do things manually, even if only once in a while. When I must do things manually, I'm not usually happy about it. In fact, it usually means that there has been an emergency, so other people aren't happy about it either. In times like this, it is nice to have a consistent and efficient user interface on every machine. The information and examples presented in this article assume that you are using the bash shell. However, you can modify all of the scripts so that they work in other shells. In some cases, they might even work unmodified (like in the standard Bourne Shell [sh]). Other shells will also work, but they might have different methods for changing the prompt and creating command aliases. The principles in this article should be relatively easy to adapt to the shell of your choice.
Linux

Storing Files/Directories In Memory With tmpfs

Post date: December 9, 2008, 12:12 Category: Miscellaneous Views: 2902 Comments
Tutorial quote: You probably know that reading from RAM is a lot of faster than reading files from the hard drive, and reduces your disk I/O. This article shows how you can store files and directories in memory instead of on the hard drive with the help of tmpfs (a file system for creating memory devices). This is ideal for file caches and other temporary data (such as PHP's session files if you are using session.save_handler = files) because the data is lost when you power down or reboot the system.
Debian

Run Your Own Webradio Station With Icecast2 And Ices2

Post date: February 18, 2007, 20:02 Category: Multimedia Views: 4731 Comments
Tutorial quote: This tutorial describes how to set up an audio streaming server with Icecast2. In order that Icecast2 can stream audio to listeners we install Ices2. Ices2 is a program that sends audio data to an Icecast2 server to broadcast to clients. Ices2 can either read audio data from disk (Ogg Vorbis files), or sample live audio from a sound card and encode it on the fly. In this article we will let Ices2 read .ogg files from the local hard disk.
Ubuntu

List of BitTorrent clients Available in Ubuntu Linux

Post date: August 12, 2008, 06:08 Category: Software Views: 3256 Comments
Tutorial quote: BitTorrent is a peer-to-peer file sharing protocol used to distribute large amounts of data. The initial distributor of the complete file or collection acts as the first seed. Each peer that downloads the data also uploads it to other peers. Relative to standard internet hosting, this provides a significant reduction in the original distributor's hardware and bandwidth resource costs. It also provides redundancy against system problems and reduces dependence on the original distributor.

A BitTorrent client is a program that manages torrent downloads and uploads using the BitTorrent protocol.
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