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Unix+clones

Teach Yourself Perl 5 in 21 days

Post date: November 24, 2005, 20:11 Category: Programming Views: 4936 Comments
Tutorial quote: No previous programming experience is required for you to learn everything you need to know about programming with Perl from this book. In particular, no knowledge of the C programming language is required. If you are familiar with other programming languages, learning Perl will be a snap. The only assumption this book does make is that you are familiar with the basics of using the UNIX operating system.
Unix+clones

DNS Common Abuses

Post date: April 17, 2005, 09:04 Category: Security Views: 2934 Comments
Tutorial quote: In paper I have present several features of DNS to make the reader familiar with the basics of the Domain Name System. I have also covered several well known and wide spread attacks that are used to exploit DNS. These attacks are by no means theoretical. In truth they grow more and more common as attackers become more sophisticated. The suggested defense methods outlined at the end of each section cover only the basic recommendations that can be used to thwart attackers.
BSD

Managing Filesystems : fstab

Post date: April 15, 2005, 23:04 Category: System Views: 7723 Comments
Tutorial quote: Understanding how the BSD filesystem manages disk space is critical to successfully managing a BSD server or workstation. However, this topic is generally overlooked since it is rarely used outside of installation and upgrades. It is also a very simple topic and most people assume you understand how it all works.

This article gives a quick synopsis on filesystem layout and tries to briefly explain how to understand /etc/fstab. The fstab(5) man pages, while good, do little to teach the basics to new sysadmins.
Fedora

Xen With Graphical User Interface On A Fedora 7 Desktop

Post date: September 18, 2007, 22:09 Category: Miscellaneous Views: 3845 Comments
Tutorial quote: This document describes how to set up Xen on Fedora 7. Xen enables the paravirtualization of your hardware for its virtual machines if you have a CPU with Vanderpool (Intel) or Pacifica (AMD) technology. The paravirtualization provides high performance to your virtual machines. Fedora's virt-manager provides an easy to use GUI for setting up and managing your virtual machines. It does not have the extensive features like VMware Server, but the basics are in place.
Linux

Automating the Login Script

Post date: April 17, 2005, 10:04 Category: Miscellaneous Views: 3084 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.
BSD

Firewalling with OpenBSD's PF packet filter

Post date: April 19, 2005, 02:04 Category: Network Views: 7646 Comments
Tutorial quote: PF operates in a world which consists of packets, protocols, connections and ports.

Based on where a packet is coming from or where it's going, which protocol, connection of port it is designated for, PF is able to determine where to lead the packet, or decide if it is to be let through at all.

It's equally possible to direct network traffic based on packet contents, usually referred to as application level filtering, but this is not the kind of thing PF does. We will come back later to some cases where PF will hand off these kinds of tasks to other software, but first let us deal with some basics.

We've already mentioned the firewall concept. One important feature of PF and similar software, perhaps the most important feature, is that it is able to identify and block traffic which is you do not want to let into your local network or let out to the world outside. At some point the term 'firewall' was coined.
Solaris

Configuring Apache

Post date: April 13, 2005, 05:04 Category: Network Views: 4785 Comments
Tutorial quote: Apache can respond to browser requests from machines on your local network (i.e. an "Intranet" Web server) or from the Internet. The installation of the Solaris OS installed and set up most of the necessary Apache files. As a result, if you want to use your system as a Web server you only need to modify one file.
OpenBSD

Apache - Serving up the Web

Post date: April 11, 2006, 22:04 Category: Network Views: 8561 Comments
Tutorial quote: The Apache Web Server is installed as part of the OpenBSD base system. This guide will help you configure the web server: (Apache 1.3.12 is released with OpenBSD 2.7 and 1.3.9 with OpenBSD 2.6)

To see how configurable the Apache/OpenBSD combination is we also look at allowing administrators to remotely review the server's status, we setup the system so we allow users on our system to have their own personal web-space. Of course, for the security counscious you probably want to turn some of these things off after you get things up and running.
Linux

Splitting Apache Logs With vlogger

Post date: June 17, 2007, 22:06 Category: Software Views: 4007 Comments
Tutorial quote: Vlogger is a little tool with which you can write Apache logs broken down by virtual hosts and days. With vlogger, we need to put just one CustomLog directive into our global Apache configuration, and it will write access logs for each virtual host and day. Therefore, you do not have to split Apache's overall access log into access logs for each virtual host each day, and you do not have to configure Apache to write one access log per virtual host (which could make you run out of file descriptors very fast).
Linux

Configuring Apache for Maximum Performance

Post date: April 1, 2006, 03:04 Category: Optimizing Views: 4956 Comments
Tutorial quote: Apache server performance can be improved by adding additional hardware resources such as RAM, faster CPU etc. But, most of the time, the same result can be achieved by custom configuration of the server. This article looks into getting maximum performance out of Apache with the existing hardware resources, specifically on the Linux systems.
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