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OpenSUSE

Preventing Brute Force Attacks With Fail2ban On OpenSUSE 10.3

Post date: October 15, 2007, 06:10 Category: Security Views: 5952 Comments
Tutorial quote: In this article I will show how to install and configure fail2ban on an OpenSUSE 10.3 system. Fail2ban is a tool that observes login attempts to various services, e.g. SSH, FTP, SMTP, Apache, etc., and if it finds failed login attempts again and again from the same IP address or host, fail2ban stops further login attempts from that IP address/host by blocking it with an iptables firewall rule.
Unix+clones

Detailed Guide On Arrays In PHP

Post date: February 8, 2007, 02:02 Category: Programming Views: 4652 Comments
Tutorial quote: Here is yet another article of Fast PHP Articles Series. Today we are going to discuss ARRAYS. We will learn its syntax, its different types, the different built-in array functions that help to perform different tasks related to arrays quickly and different practical examples explaining the use of arrays in PHP.

By the end of this article you should be able to:

- Define Arrays
- Use different types of Arrays
- Use different Built-in functions related to Arrays e.g list(), each(), var_dump, print_r, var_export()

- Write basic as well as complex php code using Arrays.
- Working with multidimensional arrays
- Understanding Foreach loop with the help of different examples
Gentoo

Build your own Gentoo rescue LiveCD and USBStick

Post date: June 20, 2005, 04:06 Category: Miscellaneous Views: 4923 Comments
Tutorial quote: I've written this how-to after trying to find a boot medium for my home gateway machine which could be used for system rescues and even installing Gentoo. Why not use the standard Gentoo Live CD you ask? Well my gateway machine is one of those small, silent and cool running mini-itx machines (http://www.mini-itx.com) and has no CDROM or floppy drive. I needed some way of getting Gentoo on there and some way of easily rescuing it when the need arises. The good news is that these VIA mini-tix machines are USB bootable and I much preferred the idea of having a little USB drive/stick that I could push into any USB bootable machine and boot into Linux rather than having to set up a PXE networked boot environment (which is also supported).
Debian

Preventing Brute Force Attacks With Fail2ban On Debian Etch

Post date: May 1, 2007, 21:05 Category: Security Views: 4209 Comments
Tutorial quote: In this article I will show how to install and configure fail2ban on a Debian Etch system. Fail2ban is a tool that observes login attempts to various services, e.g. SSH, FTP, SMTP, Apache, etc., and if it finds failed login attempts again and again from the same IP address or host, fail2ban stops further login attempts from that IP address/host by blocking it with an iptables firewall rule.
Linux

A Beginner's Guide To LVM

Post date: January 16, 2007, 19:01 Category: System Views: 3862 Comments
Tutorial quote: This guide shows how to work with LVM (Logical Volume Management) on Linux. It also describes how to use LVM together with RAID1 in an extra chapter. As LVM is a rather abstract topic, this article comes with a Debian Etch VMware image that you can download and start, and on that Debian Etch system you can run all the commands I execute here and compare your results with mine. Through this practical approach you should get used to LVM very fast.
OpenSUSE

Measuring the performance/latency of OpenSuse system - LatencyTOP

Post date: February 17, 2009, 08:02 Category: Optimizing Views: 4811 Comments
Tutorial quote: Skipping audio, slower servers, everyone knows the symptoms of latency. But to know what's going on in the system, what's causing the latency, how to fix it... that's a hard question without good answers right now.

LatencyTOP is a Linux* tool for software developers (both kernel and userspace), aimed at identifying where in the system latency is happening, and what kind of operation/action is causing the latency to happen so that the code can be changed to avoid the worst latency hiccups.
Debian

Preventing Brute Force Attacks With BlockHosts On Debian Etch

Post date: September 30, 2007, 09:09 Category: Security Views: 4035 Comments
Tutorial quote: In this article I will show how to install and configure BlockHosts on a Debian Etch system. BlockHosts is a Python tool that observes login attempts to various services, e.g. SSH, FTP, etc., and if it finds failed login attempts again and again from the same IP address or host, it stops further login attempts from that IP address/host. By default, BlockHosts supports services that use TCP_WRAPPERS, such as SSH, i.e. services, that use /etc/hosts.allow or /etc/hosts.deny, but it can also block other services using iproute or iptables.
Ubuntu

A much easier way to install Ubuntu on a USB device (Stick or Hard Disk)!

Post date: June 1, 2008, 21:06 Category: Software Views: 4238 Comments
Tutorial quote: This tutorial will explain A much easier way to install Ubuntu on a USB device (Stick or Hard Disk).I was reading How to install Ubuntu Linux from USB Stick posted a while ago, and found it to be quite some work to get Ubuntu working on a USB stick. Besides, having to prepare your USB device, creating a separate partition on it which will be more or less “useless” after the installation, giving up 750MB of space?

FreeBSD

Using Software RAID-1 with FreeBSD

Post date: April 28, 2008, 17:04 Category: System Views: 6007 Comments
Tutorial quote: Have you ever needed a software RAID solution for a low-end server install? Perhaps you've wanted your workstation to take advantage of the redundancy provided by a disk mirror without investing in a hardware RAID controller. Has a prior painful configuration experience turned you off software RAID altogether on Unix systems?

Since 5.3-Release, FreeBSD comes with gmirror(8), which allows you to easily configure a software RAID 1 solution.
Linux

The Linux /proc Filesystem as a Programmers' Tool

Post date: June 22, 2005, 09:06 Category: Programming Views: 3367 Comments
Tutorial quote: My entry into systems programming was guided by my desire to understand further the operating systems I was working with daily as a contract UNIX and, later, Linux system administrator. The result of this was ifchk, a packet sniffer detector I wrote in C and released in June of 2003. ifchk initially was written under IRIX and then ported to Linux, mostly under the 2.4 kernel. The current ifchk revision, beta 4, recently was released and beta 5 is on the way.

My work on ifchk has allowed me to examine programmatically several areas of operating system functionality. Examples include the Linux netlink(7) and rtnetlink(7) facilities, device control--that is, network interfaces--via ioctl(2), signals and proc, the process filesystem. Proc and its ability to display a wide array of data concerning the runtime state of a system are the focus of our discussion here.
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