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Linux tutorials
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Xen Virtualization and Linux Clustering, Part 2 |
| Post date: January 21, 2006, 00:01 Category: System Views: 1136 Comments: 0 |
| Tutorial quote: We ended last time after configuring our first unprivileged Xen domain. In this article, we complete our cluster and then test it using an open-source parallel ray tracer. The first thing we need to do is create additional slave nodes to be used with the cluster. So, let's get down to business. |
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Xen Virtualization and Linux Clustering, Part 1 |
| Post date: January 21, 2006, 00:01 Category: System Views: 1272 Comments: 0 |
Tutorial quote: Have you heard about Xen virtualization and want to get some hands-on experience? Do you want to experiment with Linux clustering but only have a single computer to devote to the cause? If you answered yes to either of these questions, keep reading.
In this article, I briefly introduce the concepts of Xen virtualization and Linux clustering. From there, I show you how to set up multiple operating systems on a single computer using Xen and how to configure them for use with clustering. I should point out that a cluster implemented in this manner does not provide the computational power of multiple physical computers. It does, however, offer a way to prototype a cluster as well as provide a cost-effective development environment for cluster-based software. Even if you're not interested in clustering, this article gives you hands-on experience using Xen virtualization. |
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Benchmarking Filesystems Part II |
| Post date: January 6, 2006, 16:01 Category: Benchmarks Views: 2506 Comments: 0 |
| Tutorial quote: After the last article was published, I have received more than a dozen requests for a second filesystem benchmark using the 2.6 kernel. Since that time, I have converted entirely to XFS for every Linux machine I use, so I may be a bit bias regarding the XFS filesystem. I tried to keep the hardware roughly the same. Instead of a Western Digital 250GB and Promise ATA/100 controller, I am now am using a Seagate 400GB and Maxtor ATA/133 Promise controller. The physical machine remains the same, there is an additional 664MB of swap and I am now running Debian Etch. In the previous article, I was running Slackware 9.1 with custom compiled filesystem utilities. I've added a small section in the beginning that shows the filesystem creation and mount time, I've also added a graph showing these new benchmarks. After the first round of benchmarks, I received a sleuth of e-mails asking for the raw numbers. The numbers are now included in tables at the end of this e-mail for both the last and current set of benchmarks. |
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Add Windows media support to your Linux box |
| Post date: December 31, 2005, 09:12 Category: Multimedia Views: 1197 Comments: 0 |
| Tutorial quote: Having trouble getting .WMV, .WMA, and .ASF files - the Windows-based media formats - to open on your Linux box? Being forced to dual-boot or switch workstations just to listen to or watch audio and video clips is usually more effort than it's worth. But fortunately, if you are using Xine and one of its frontends like Totem, you can add support for these file formats within Linux. |
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Bandwidth monitoring with iptables |
| Post date: December 27, 2005, 09:12 Category: Network Views: 1525 Comments: 0 |
| Tutorial quote: Linux has a number of useful bandwidth monitoring and management programs. A quick search on Freshmeat.net for bandwidth returns a number of applications. However, if all you need is a basic overview of your total bandwidth usage, iptables is all you really need -- and it's already installed if you're using a Linux distribution based on the 2.4.x or 2.6.x kernels. |
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Gnu Queue: Linux Clustering Made Easy |
| Post date: December 22, 2005, 13:12 Category: System Views: 1066 Comments: 0 |
| Tutorial quote: GNU Queue makes it easy to cluster Linux workstations. If you already know how to control jobs running on your local machine, you already know how to control remote jobs using GNU Queue. You don't even need special privileges to install and run GNU Queue on your cluster--anyone can do it. Once you've discovered how incredibly easy it is to cluster Linux environments with GNU Queue, you'll wonder why organizations continue to spend so much money on comparatively hard-to-cluster Windows NT environments. |
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Profiling in Linux Performance Tuning |
| Post date: December 18, 2005, 15:12 Category: Optimizing Views: 1355 Comments: 0 |
| Tutorial quote: This chapter covers several methods to measure execution time and real-time performance. The methods give different types of granularity, from the program’s complete execution time to how long each function in the program takes. |
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Using iptables to rate-limit incoming connections |
| Post date: December 16, 2005, 16:12 Category: Network Views: 1518 Comments: 0 |
Tutorial quote: There are times when you have to allow arbitary incoming connections, when you are travelling for example.
In these situations you can open up your system to allow incoming connections and be the target of a dictionary attack - literally a machine trying to connect and login over and over again using usernames and passwords from a dictionary.
In this situation you can create a collection of firewalling rules which will deny access from remote clients who attempt to connect "too many" times. |
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Cutting the tcp/ip network connection with cutter |
| Post date: December 12, 2005, 21:12 Category: Network Views: 927 Comments: 0 |
| Tutorial quote: Recently I came across very powerful and nifty tool (used by one of our Sr. network admin). Just imagine that people in your private network using peer to peer software such as Kazaa, iMesh or others and you want to cut them or just want to cut all ftp connection over my firewall but not all traffic to host. |
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