PUBLIC MARKS from camel with tag debian

This guide describes how to set up a full email solution in Debian Linux (all code is from Debian Etch). I was asked to design a secure, scalable, portable solution for a small company. While the guide references many 'servers', the company only had 4 physical machines, Xen was used to virtualize the entire solution. That particular aspect of the system is not discussed in this guide, although I will try to get it into the next revision.

This article explains how to set up a two-node load balancer in an active/passive configuration with HAProxy and keepalived on Debian Etch. The load balancer sits between the user and two (or more) backend Apache web servers that hold the same content. Not only does the load balancer distribute the requests to the two backend Apache servers, it also checks the health of the backend servers. If one of them is down, all requests will automatically be redirected to the remaining backend server. In addition to that, the two load balancer nodes monitor each other using keepalived, and if the master fails, the slave becomes the master, which means the users will not notice any disruption of the service. HAProxy is session-aware, which means you can use it with any web application that makes use of sessions (such as forums, shopping carts, etc.).

Since version 5, MySQL comes with built-in support for master-master replication, solving the problem that can happen with self-generated keys. In former MySQL versions, the problem with master-master replication was that conflicts arose immediately if node A and node B both inserted an auto-incrementing key on the same table. The advantages of master-master replication over the traditional master-slave replication are that you don't have to modify your applications to make write accesses only to the master, and that it is easier to provide high-availability because if the master fails, you still have the other master.

Using NTP is a great way to keep your system clock set correctly. It works by contacting a number of servers around the world, asking them for the time and then calculating what the correct local time is from their responses.

Rsyslog is an enhanced multi-threaded syslogd supporting, among others, MySQL, syslog/tcp, RFC 3195, permitted sender lists, filtering on any message part, and fine grain output format control. It is quite compatible to stock sysklogd and can be used as a drop-in replacement. Its advanced features make it suitable for enterprise-class, encryption protected syslog relay chains while at the same time being very easy to setup for the novice user. An optional web interface - phpLogCon - can be used to visualize all data online."

This document describes how to set up Amanda (The Advanced Maryland Automatic Network Disk Archiver) on Debian Etch. For this tutorial I chose Ubuntu v7.04 as a backup-client. The resulting system provides a flexible backup-system with many features. It will be able to back up multiple hosts via network to various devices. I chose the disk based backup for this howto.

Comme vous le savez, aptitude permet de purger un paquet, c'est-à-dire de supprimer les fichiers de configurations associés à un paquet (en plus de sa suppression). Pour purger tous les fichiers de configurations fantômes (plus associés à aucun paquet), il suffit de faire: aptitude purge $(dpkg --get-selections | grep deinstall | awk '{print $1}')

This guide shows how to install and configure Smokeping on Debian Etch to monitor network latency. From the Smokeping web site: "SmokePing is a deluxe latency measurement tool. It can measure, store and display latency, latency distribution and packet loss. SmokePing uses RRDtool to maintain a longterm data-store and to draw pretty graphs, giving up to the minute information on the state of each network connection."

This HOWTO enables you to build a complete open source turn-key email server in a matter of hours (instead of days or weeks). In one sense it is more like one big script that requires intervention. It can be considered a howto if one reads the contents of each patch and script I provide.

This tutorial describes two ways how to give users chrooted SSH access. With this setup, you can give your users shell access without having to fear that they can see your whole system. Your users will be jailed in a specific directory which they will not be able to break out of. The users will also be able to use SFTP in their chroot jails.

VAFEO est une suite des distributions Linux qui propose des applications open source parmi les plus réputées. Les distributions VAFEO sont composées d'une base Debian Etch et d'un ensemble d'applications cohérentes. VAFEO offre des images systèmes prêtes à utiliser dans de différents environnements virtuels : KVM, Parallels, VirtualBox, Virtual PC, VMWare, ou Xen. VAFEO existe aussi sous forme de Live CD/DVD qui permet aux utilisateurs d'effectuer une évaluation rapide de la suite. Dans le cas où le système répond aux attentes, l'outil vafeo2hd pourra être activé afin d'installer une distribution sur disque dur pour un usage permanent.

Setting Up An iSCSI Environment On Linux Nowadays, the iSCSI technology is quite popular in the storage world. This article shows an iSCSI demo environment which consists of one Debian Linux host and one Netapp Filer.We try to show the most important features of this protocol. 1. What is iSCSI? It is a network storage protocol above TCP/IP. This protocol encapsulates SCSI data into TCP packets. iSCSI allows us to connect a host to a storage array via a simple Ethernet connection (tape drive). This solution is cheaper than the Fibre Channel SAN (Fibre channel HBAs and switches are expensive). From the host view the user sees the storage array LUNs like a local disks. iSCSI devices should not be confused with the NAS devices (for example NFS). The most important difference is that NFS volumes can be accessed by multiple hosts, but one iSCSI volume can by accessed by one host. It is similar to SCSIi protocol: usually only one host has access to one SCSI disk (the difference is the cluster enviroment). The iSCSI protocol is defined in the RFC3720 document by the IETF (Internet Engineering Task Force).

This tutorial provides step-by-step instructions about how to create a highly available VMware Server environment on a Debian Etch system. With this tutorial, you will be able to create Virtual Machines that will be available on multiple systems with failover/failback capabilities.

In our previous introduction to Puppet we covered installing the client and server, such that a small LAN could be configured centrally. Here we'll demonstrate some of the things that can be done with such a setup

voici un tutorial sur l'installation au grand complet d'un serveur sur une distribution sarge, j'ai repiqué par-ci et par-là des informations et j'ai tout regroupé dans un tutorial qui est fonctionnel car je l'ai testé sur un serveur dédié OVH et Dédibox et même en local.

A control panel allows the customers of a web hosting company to manage much of their own affairs. For example, the control panel allows the owner of a domain to create and manipulate email and ftp accounts. The customer gets to do things quicker and without having to pay the hosting company for stuff they could do themselves.

Tagada est un projet de logiciel libre visant à familiariser l'utilisateur avec sa machine. Parce que la machine, elle est gentille ! Article explicatif sur le logiciel : APT c'est dépassé et plus personne ne devrait l'utiliser parce que cet imbécile ne vérifie pas les dépendances à la suppression ('faut surtout pas dire à ces gens qu'il suffit de tapper une commande pour y remédier). Et puis, Aptitude c'est une fausse promesse, c'est un peu simple de coller deux commandes à la suite et de dire que ton programme est mieux. Heureusement, il y a des bons programmeurs sur cette planète, entourés de grands esprits qui les conseillent... C'est ainsi qu'est né tagada, le nouveau système pour installer des paquets sous Ubuntu. Notons d'ailleurs que tagada est aussi utilisable sur les distributions Debian et basées sur Debian.

eBox management tool will effectively and easily help you managing the advanced services for your corporate network. Designed with extensibility in mind it offers, among others, these modules: Firewall, Transparent proxy, Content filter, NTP Server, Users and groups, Mail server