HowtoForge - Linux Howtos and Tutorials - Linux

How To Set Up Multi-Master Replication Using Tungsten And MySQL-Proxy For MySQL High Availability On Ubuntu 10.04.3 LTS

Wed, 18 Jan 2012 18:01:08 +0100

How To Set Up Multi-Master Replication Using Tungsten And MySQL-Proxy For MySQL High Availability On Ubuntu 10.04.3 LTS

This tutorial is based on my experience setting up Tungsten Replicator and MySQL-Proxy for a client's production setup.

How To Set Up Kojoney SSH Honeypot On CentOS 5.5

Fri, 01 Oct 2010 18:43:42 +0200

How To Set Up Kojoney SSH Honeypot On CentOS 5.5

Kojoney is a low level interaction honeypot that emulates an SSH server. The daemon is written in Python using the Twisted Conch libraries. In computer terminology, a honeypot is a trap set to detect, deflect, or in some manner counteract attempts at unauthorized use of information systems. Generally it consists of a computer, data, or a network site that appears to be part of a network, but is actually isolated, (un)protected, and monitored, and which seems to contain information or a resource of value to attackers. This tutorial shows how you can compile and install updated version of Kojoney on CentOS 5.5 server.

Boot Linux Over HTTP With netboot.me

Tue, 29 Sep 2009 16:59:38 +0200

Boot Linux Over HTTP With netboot.me

This tutorial shows how you can boot Linux over HTTP with netboot.me. All that users need is Internet connectivity and a small program (gpxe) to boot the machine. This gpxe program provides network booting facility. netboot.me allows you to boot into the following distributions: Debian, Fedora, OpenSUSE, and Ubuntu. netboot.me provides gpxe images for USB sticks, CDs, and also for floppies, i.e., you can boot from a USB sticks, a CD, or a floppy.

How To Defend slowloris DDoS With mod_qos (Apache2 On Debian [Lenny])

Wed, 15 Jul 2009 20:06:19 +0200

How To Defend slowloris DDoS With mod_qos (Apache2 On Debian [Lenny])

mod_qos gives some fine-grained opportunities to scale the number of used connections and to defend an attack according to bandwidth limits. Unfortunately it is only available as source-package and there are many possible settings, wich might be hard to setup for this special case. So I provide the way that helped me.

Installing ehcp (Easy Hosting Control Panel) On Any Debian Or Apt-Get Based Distro, Including Ubuntu

Wed, 24 Oct 2007 12:50:34 +0200

Installing ehcp (Easy Hosting Control Panel) On Any Debian Or Apt-Get Based Distro, Including Ubuntu

In this tutorial I will show you howto install ehcp on any debian based distro, or any distro that has apt-get support. ehcp stands for Easy Hosting Control Panel. It may be used by anyone wanting to host multiple domains in his dedicated/vps server. It is a hosting control panel under development.

How To Utilize Your New Multimedia Keyboard Under Linux

Fri, 27 Apr 2007 16:36:44 +0200

How To Utilize Your New Multimedia Keyboard Under Linux

Xbindkeys is a program that allows you to launch shell commands with your keyboard or your mouse under X Window. It links commands to keys or mouse buttons, using its configuration file. It does not depend on the window manager and can capture all keyboard keys.

Create Users And Change Passwords With A Bash Script

Fri, 16 Mar 2007 16:33:09 +0100

Create Users And Change Passwords With A Bash Script

These two scripts are very important for the system admin who regularly works with mail servers and somehow forgets to backup his system username and password! Let’s say somehow we lost the usernames and passwords of the mail server. In this case the admin has to manually create all the users and then change the passwords for all the users. Tedious job. Let’s make our life easier.

Setting the SUID/SGID bits: Giving a program YOUR permissions when it runs

Fri, 02 Mar 2007 14:57:47 +0100

Setting the SUID/SGID bits: Giving a program YOUR permissions when it runs

Normally, when a program runs under Linux, it inherits the permissions of the user who is running it, thus if I run a program under my account, the program runs with the same permissions that I would have if that program were me. Thus, if I cannot open a certain file, the program I am running also cannot open the file in question. If I set the SUID or SGID bit for a file, this causes any persons or processes that run the file to have access to system resources as though they are the owner of the file.

Using TAR with Bunzip2 files

Fri, 02 Mar 2007 14:41:01 +0100

Using TAR with Bunzip2 files

Bunzipping and then unTARring in two steps is not convenient.

It is not necessary to use Bunzip2 and then TAR to unzip a file in two separate steps.

Tar will do the job on its own if the -j switch is used, thus:

tar xjvf linux-source<version>.tar.bz2

By the same token, you may use the -z switch with a gzipped file, e.g.

tar zxvf linux-source<version>.tar.gz

Cisco 350 Series And Kismet

Fri, 24 Nov 2006 15:20:47 +0100

Cisco 350 Series And Kismet

This tutorial is describing how to configure a Cisco Aironet wireless card and how to set up kismet in order to run with it.

Step-By-Step Configuration of NAT with iptables

Wed, 08 Nov 2006 19:53:03 +0100

Step-By-Step Configuration of NAT with iptables

This tutorial shows how to set up network-address-translation (NAT) on a Linux system with iptables rules so that the system can act as a gateway and provide internet access to multiple hosts on a local network using a single public IP address. This is achieved by rewriting the source and/or destination addresses of IP packets as they pass through the NAT system.

How do I start the X server in Suse 9.2 when the graphic card is working work in text mode?

Mon, 07 Aug 2006 17:03:40 +0200

To start the X server from a text mode session, execute the command:

startx

How do I find out if a remote system is still alive, if certain services are running, which processes are running, etc.?

Mon, 07 Aug 2006 16:58:36 +0200

You can use ping to see if the system is alive:

ping -c4 <system's IP address>

To see if a certain service is still alive, use the telnet command:

telnet <system's IP address> 25 (for SMTP)

telnet <system's IP address> 80 (for HTTP)

telnet <system's IP address> 110 (for POP3)

You can login to the system using SSH (port 22) (use PuTTY if you are on a Windows PC; PuTTY is an SSH client for Windows), and when you are on the system, you have a few useful tools to gather more information:

How do I scan my Linux system for rootkits, worms, trojans, etc.?

Mon, 07 Aug 2006 16:48:39 +0200

Either with chkrootkit or with rkhunter.

chkrootkit

Either install the package that comes with your distribution (on Debian you would run

apt-get install chkrootkit

), or download the sources from www.chkrootkit.org and install manually:

wget --passive-ftp ftp://ftp.pangeia.com.br/pub/seg/pac/chkrootkit.tar.gz
tar xvfz chkrootkit.tar.gz
cd chkrootkit-<version>/
make sense

Afterwards, you can move the chkrootkit directory somewhere else, e.g. /usr/local/chkrootkit:

How can I get a list of quotas assigned to my users and groups and of the space used by them?

Mon, 07 Aug 2006 16:45:48 +0200

repquota -avug

shows a list for both users and groups.

repquota -au

shows a list for users,

repquota -ag

a list for groups.