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February 2008

Using Nagios to Monitor Networks

by lecyborg
Nagios is a powerful, modular network monitoring system that can be used to monitor many network services like smtp, http and dns on remote hosts. It also has support for snmp to allow you to check things like processor loads on routers and servers. I couldn't begin to cover all of the things that nagios can do in this article, so I'll just cover the basics to get you up and running.

Postfix Cyrus IMAP SSL LDAP

by lecyborg
La série d'articles de cette rubrique est entièrement dédiée à la mise en oeuvre d'un serveur de mail basé sur Postfix et Cyrus-Imap. Ces deux éléments sont tout simplement ce qui ce fait de mieux actuellement dans leur domaine respectif: * Postfix : protocole smpt ou smtps pour le mode sécurisé * Cyrus imap : protocole POP3 ou POP3S (mode sécurisé) ou IMAP ou IMAPS (mode sécurisé).

January 2008

Integrating amavisd-new Into Postfix For Spam- And Virus-Scanning

by lecyborg & 1 other
This article shows how to integrate amavisd-new into a Postfix mail server for spam- and virus-scanning. amavisd-new is a high-performance interface between MTAs such as Postfix and content checkers: virus scanners, and/or SpamAssassin. We will use ClamAV for virus scanning and SpamAssassin for spam scanning in this tutorial. I want to say first that this is not the only way of setting up such a system. There are many ways of achieving this goal but this is the way I take. I do not issue any guarantee that this will work for you!

Postfix Virtual Domain Hosting Howto

by lecyborg
This document requires Postfix version 2.0 or later. This document gives an overview of how Postfix can be used for hosting multiple Internet domains, both for final delivery on the machine itself and for the purpose of forwarding to destinations elsewhere. The text not only describes delivery mechanisms that are built into Postfix, but also gives pointers for using non-Postfix mail delivery software.

December 2007

Convertir système debian en Raid1

by lecyborg
Our intention is not to build a fail-safe system nor a HA-Linux. We are just using RAID-1 mirrored disks to make sure that the system can be restored easily if 1 disk crashes. The following has been tested only twice (hey, we've got other things to do). It did work for us, it might work for you. It might also make your rats go berserk or just blow your mind.

November 2007

Data Encryption

by lecyborg
Gestion du cryptage des données avec Bacula.

SSH Port Forwarding

by lecyborg
SSH also has a wonderful feature called SSH Port Forwarding, sometimes called SSH Tunneling, which allows you to establish a secure SSH session and then tunnel arbitrary TCP connections through it. Tunnels can be created at any time, with almost no effort and no programming, which makes them very appealing. In this article we look at SSH Port Forwarding in detail, as it is a very useful but often misunderstood technology. SSH Port Forwarding can be used for secure communications in a myriad of different ways. Let's start with an example.

RAID1 on Debian Sarge

by lecyborg
A RAID device is a Redundant Array of Independent Disks. The concept was developed in 1987 at UC Berkeley and involves the creation of a virtual disk from multiple small disks in order to deliver improved performance and reliability. There are many flavors of RAID and lots of variations in how to implement it. We detail here a specific instance we use: software RAID1 using IDE disks on a Dell PowerEdge box running Debian "sarge" loaded with grub, managed by mdadm, using the ext3 journaling file system.

How to convert your debian partition to a software raid 1 on the fly

by lecyborg
The system is equipped with 2 similar hard disks (they do not have to be the same but it helps if they are at least similar). The first disk is attached to the primary IDE as master, it will be referenced as /dev/hda. The second disk is attached to the secondary IDE also as master, it will be referenced as /dev/hdc.

How to Install Openvpn

by lecyborg
The purpose of this document is to describe how to install OpenVPN server on an Ubuntu Linux system and have it utilize an Ethernet bridge to access your local network. Ethernet bridges essentially allow the operating system to treat multiple network interfaces as one combined port. When used with OpenVPN a bridge will allow you to easily connect external users to your internal network and have them receive all traffic as though they were locally connected. The alternative is to use OpenVPN with a route but that will not allow some forms of traffic through (such as multicast), multicast traffic is important to me as many games require multicast data.

Le RAID sous GNU/Linux

by lecyborg
Ce document explique comment mettre en place plusieurs types différents de RAID logiciel sur une plateforme Linux.

October 2007

Xen from Backports on Debian Sarge

by lecyborg
There is a great howto about installing Xen on Debian Unstable. It is really easy to do and it runs fine. Nevertheless, on production servers, that's not an optimal solution. Debian Unstable has too many updates and things change too often. On production machines, a Xen host system should be stable, secure and should not need much attention. That is where Sarge comes in. If you pull the Xen packages from backports and install them on Debian stable you've got the best of both worlds. Let's do so!

Firewall et sécurisation d'un réseau personnel sous Linux

by lecyborg & 1 other
Ce document a pour but d'expliquer les rudiments de la sécurité d'une machine Linux placée dans un réseau local (typiquement une maison on un appartement), reliée à Internet. Il est tout particulièrement destiné aux utilisateurs néophytes, ou n'ayant pas ou peu de connaissance sur la sécurité informatique en général, et sous Linux en particulier.

May 2007

13 Raccourcis clavier pour Bash

by lecyborg
e shell par défaut sur de nombreux linux est bash. Il existe bien évidemment un bon nombre de raccourcis clavier pour vous faciliter la vie... une fois que vous arrivez à les retenir (et je sais comme c'est dur :D) ! Ici, je vous propose de passer en revue 13 d'entre eux qui vont vous être utiles au quotidien

Ubuntu :: the How-To Geek

by camel & 8 others
Une incroyable collection de how-to en anglais concernant ubuntu, pour une utilisation un peu avancée.

Ubuntu :: the How-To Geek

by lecyborg & 8 others
Une incroyable collection de how-to en anglais concernant ubuntu, pour une utilisation un peu avancée.

backuppc

by lecyborg & 2 others
BackupPC est un logiciel libre de sauvegardes informatiques publié sous licence GPL. Cet article va vous indiquer comment installer BackupPC, comment le configurer et comment configurer les machines clientes (Windows ou Linux).

zabbix

by lecyborg
La gestion d'un parc de serveur est un travail de chaque instant. Un bon administrateur système doit savoir à tout moment l'état des différentes machines et des différents services. Un autre aspect clé est que l'administrateur ne peut pas se permettre de passer son temps devant un tableau avec des voyants verts en attendant qu'un voyant passe au rouge pour agir. Son temps est occupé à d'autres tâches et il ne peut donc pas surveiller le tableau de statut en permanence.

April 2007

Tutorial d'installation d'Oreon

by lecyborg & 1 other
Cette documentation a été réalisé avec une Debian Sarge 3.1

March 2007

Accents des fichiers Samba/Linux

by lecyborg
On a donc le charset ISO-8859-1 utilisé sur la machine qui fait tourner samba (à vous de spécifier le votre, en général ce sera celui là sur une installation en français), et sur les clients windows, on a la page de code 850 (pour la connaitre, taper chcp en ligne de commande sous windows).

Ubuntu Active Directory & Samba

by lecyborg & 1 other
Comment ajouter une machine Ubuntu dans un domaine Active Directory ?

Securiser apache avec SSl

by lecyborg
Une des façons de sécuriser la transmission des données est d'utiliser des protocoles d'authentification et de chiffrement tels que SSL.

January 2007

Initiation aux expressions régulières en PHP - Club d'entraide des développeurs francophones

by -Nicolas- & 2 others
PHP dispose de divers moyens permettant de vérifier le contenu d'une variable. Ce tutoriel traite des expressions régulières, aussi appelées expressions rationnelles.

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