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Debian

Setting Up A Highly Available NFS Server

Post date: April 1, 2006, 05:04 Category: Network Views: 6322 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).
OpenSUSE

Ext4 support on OpenSuse 11.1

Post date: January 5, 2009, 10:01 Category: System Views: 3984 Comments
Tutorial quote: Kernel 2.6.28 Released

Torvald released the final version of Linux Kernel 2.6.28. It's not a big change since RC 9, but it finally appeared as final after lots of discussion on LKML whether to postpone the release or release earlier and make the merge window longer as the developers goes on long holidays.

Here's some summary of Kernel 2.6.28 (taken from KernelNewbies): Linux 2.6.28 adds the first version of Ext4 as a stable filesystem, the much-expected GPU memory manager which will be the foundation of a renewed graphic stack, support for Ultra Wide Band (Wireless USB, UWB-IP), memory management scalability and performance improvements, a boot tracer, disk shock protection, the phonet network protocol, support of SSD discard requests, transparent proxy support, several new network drivers, controlable IO CPU affinity, high-resolution poll()/select(), support of a minimal "dummy" policy in SELinux, tracing improvements, x86 x2APIC support, a fb driver for VIA UniChrome devices, Mitac Mio A701 ARM-based smartphone support, some new drivers, improved device support, and many other small improvements and fixes.
Gentoo

Creating a WebDAV server with apache2

Post date: May 26, 2005, 16:05 Category: Network Views: 4913 Comments
Tutorial quote: I needed a way to share information (both read and write) as easy as possible with friends in a quite restricted environment (firewall). In many cases, WebDAV which uses standard HTTP port 80 for comunication is a good solution for a file server application.
Linux

The Serial Console

Post date: April 14, 2005, 13:04 Category: Hardware Views: 3191 Comments
Tutorial quote: In these modern times, a hardworking admin might be tempted to turn her back on the Old Ways, and indulge in increasingly exotic methods of interfacing with servers: SSH over ethernet, USB, Firewire, wireless, infrared, KVM switches, VNC, VPN... next stop: direct neural implants.

There's one old timer that still has useful place in the admin's tool kit: the serial console. Sure, it's slow and funky. But there are times it can be a real lifesaver. When nothing else works, it's a direct pipeline into your system. It's simple and cheap. You don't need to install drivers or expansion cards, it's just there.

Administration via serial console is common in data centers. Just imagine the nightmare of trying to connect all those rack units to keyboards and displays. The cabling can be extended to a nice comfortable ops center (well, an ops center, anyway). (This Lantronix Console Manager is an example of the type of device used to administer these.)

There are a number of ways to make the physical connection. You can connect an external modem--the kind us old timers fondly refer to as "real" modems--and do remote administration via dialup. It couldn't be any simpler, just dial direct. Or grab a null modem cable, connect to a laptop or a nearby workstation, and you have an instant terminal.
FreeBSD

Creating A DNS Cache With djbdns

Post date: May 5, 2007, 22:05 Category: Installing Views: 3755 Comments
Tutorial quote: Building a local DNS cache will speed up your internet connection since the time for the translation job (converting domain names into IP addresses) will become negligible with the assumption that the DNS cache gets the information from the parent DNS.
Unix+clones

Unattended, Encrypted, Incremental Network Backups

Post date: August 12, 2005, 18:08 Category: Network Views: 3228 Comments
Tutorial quote: This article describes a complete system for creating a centralised backup system, complete with strong encryption. Incremental backups are used to minimize the bandwidth, and time, used.
Linux

Hardening Linux: a 10 step approach to a secure server

Post date: June 22, 2005, 10:06 Category: Security Views: 3529 Comments
Tutorial quote: The Internet has become a far more dangerous place than it was 20 years ago. Nowadays, Operating System and application security is an integral part of a server configuration and, while firewalls are very important, they are not the panacea.

This list of steps is intended as a guideline with a practical approach. We’ll try to provide a complete picture without getting into unnecesary details. This list won’t replace a good book on secure systems administration, but it will be useful as a quick guide.

Before we get started it’s worth to mention that security is not a status: it’s just a process. The correct initial setup of the server only provides a good start and helps you get half the way through. But you actually need to walk the other half of the road, by providing proper security vigilance, monitoring and updating.
SuSe

How to set up the SUSE Linux Virtual I/O Server

Post date: May 28, 2005, 00:05 Category: Network Views: 4074 Comments
Tutorial quote: Reduce your operation costs for complex environments by creating efficient and flexible virtualisation capabilities. Nigel Griffiths describes the benefits of the IBM® POWER5™ servers and provides examples on how to set up the environment for pSeries®, p5, and eServer™ OpenPower systems.
Ubuntu

Creating Screencasts With recordMyDesktop On Ubuntu 9.04

Post date: August 6, 2009, 11:08 Category: Desktop Views: 2165 Comments
Tutorial quote: recordMyDesktop is a desktop session recorder for GNU/Linux that attemps to be easy to use, yet also effective at its primary task. It produces files using only open formats. These are theora for video and vorbis for audio, using the ogg container. This tutorial shows how to install and use recordMyDesktop on Ubuntu 9.04.
Linux

Linux GPRS/EDGE via Bluetooth

Post date: August 29, 2006, 15:08 Category: Network Views: 3268 Comments
Tutorial quote: In this guide I will show you howto configure internet access through GPRS/EDGE, using bluetooth connection with your GSM phone.
Web-based applications and online marketing solutions - LumoLink