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Search results for Xen Virtualization and Linux Clustering, Part 1

FreeBSD Using FreeBSD's ACLs
Post date: September 29, 2005, 12:09 Category: Security Views: 1239 Comments: 0
Tutorial quote: Five years ago (gee, has it really been that long?), I wrote a series of articles on understanding Unix permissions. Since then, FreeBSD has implemented something known as ACLs (Access Control Lists).

ACLs came to BSD as part of the TrustedBSD project. As the name suggests, they give a user finer access control over permissions.
Linux Hardening Linux: a 10 step approach to a secure server
Post date: June 22, 2005, 05:06 Category: Security Views: 1433 Comments: 0
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.
Unix+clones File Transfer Protocol
Post date: April 12, 2005, 13:04 Category: Network Views: 795 Comments: 0
Tutorial quote: Wake up, you goodness-to-GUI slacksters! It's time to get up and get out of that hammock and put your feet on the ground and your hands on the CLI. This week we're going to talk about data in motion. Taking a file from one place on the network. Putting it someplace else. Most often today some form of FTP, the File Transfer Protocol, is used to do those things. It's been part of the Internet since there was an Internet.
FreeBSD FreeBSD Networking Basics
Post date: April 12, 2005, 19:04 Category: Network Views: 1532 Comments: 0
Tutorial quote: Beginners to Unix-like operating systems such as FreeBSD are often stymied by their network settings. Sure, the install process may have set up your NIC for you, but where do you go to view these settings, and how do you proceed if your NIC stops working? Since networking is such an integral part of computing, this article will demonstrate how to verify, configure, and optimize your network settings.
Unix+clones Using Gmail as GNOME’s default mailer
Post date: May 17, 2006, 10:05 Category: Desktop Views: 909 Comments: 0
Tutorial quote: I started using Gmail as my primary mail application a little over a year ago. For the most part, it has been a pleasurable experience. However, to my knowledge there has not been a simple way to make Gmail your default mailer in GNOME. There are firefox extensions that implement this functionality, but I used epiphany and the functionality does not extend to the entire GNOME desktop.
RedHat How to set up a home DNS server
Post date: December 17, 2006, 11:12 Category: Network Views: 4003 Comments: 0
Tutorial quote: In the first part of this series on the Domain Name System (DNS), we set up a caching nameserver that allowed our clients to take advantage of faster network operations by caching frequently requested DNS queries. In this article, we will extend our caching nameserver to a master nameserver that is responsible for managing the authoritative information for our internal client hostnames.
Unix+clones OpenOffice Tips: Writer, Calc and Impress
Post date: April 14, 2005, 08:04 Category: Software Views: 757 Comments: 0
Tutorial quote: Making the switch from Microsoft Office to OpenOffice can save you a lot of money on licensing fees, and it isn't difficult--most people get used to the changes quickly. But if you've been using MS Office for the best part of a decade and learned a few of its tricks along the way, you may find yourself baffled about how to do certain tasks in OpenOffice. Here are a few tips on using Writer, Calc and Impress.
Unix+clones Introduction to Python
Post date: April 17, 2005, 04:04 Category: Programming Views: 937 Comments: 0
Tutorial quote: Ok, first part is going to be fairly boring, but put up with it. Im just going to go through a few reasons why you should choose Python as a language to learn. First off it free!, there is no cost involved in gettin Python, although there is a license, but this is just a standard license that goes with all free and open source software. Python is an open source language, as is the interpreter (Python is written in C).
Linux Arcane Linux Commands: dc
Post date: December 30, 2007, 19:12 Category: Miscellaneous Views: 956 Comments: 0
Tutorial quote: If anybody within earshot of you is struggling to learn sed and ever remarks "This is like learning Klingon! Could they make it any more cryptic?", you can always point them to dc.

dc is the command-line Unix "Reverse-Polish Notation"(RPN) calculator. The name stands for "desktop calculator". OK, so what is a Polish calculator and why would you want to reverse one? The math that you do in school uses infix notation, with the operator between the numbers (3 + 5). Prefix notation puts the operator first (+ 3 5) and is what the Lisp language uses. The prefix notation is known as "Polish notation" after the nationality of Jan Łukasiewicz who invented it. Postfix notation, then, has the operator at the rear (3 5 +), and so is also the reverse of Polish notation.

What's the difference? In computer programming, you have to specify what order you want a multi-part calculation to be in. Everybody is familiar with the old problem of A*B-C. For A=5, B=3, C=2, multiplying first and subtracting second gives you 13, while subtracting first and multiplying second gives you 5. To specify which operations you want performed first, you have to either memorize the complex orders of operations (which change from one language to the next) or use a lot of parenthesis ((A*B)-C) or (A*(B-C)). Hey, that's what everybody complains about in all those languages that use parenthesis!
Debian PostgreSQL Database Server Configuration in Debian
Post date: March 24, 2006, 11:03 Category: Software Views: 815 Comments: 0
Tutorial quote: PostgreSQL is a fully featured object-relational database management system. It supports a large part of the SQL standard and is designed to be extensible by users in many aspects. Some of the features are: ACID transactions, foreign keys, views, sequences, subqueries, triggers, user-defined types and functions, outer joins, multiversion concurrency control. Graphical user interfaces and bindings for many programming languages are available as well.