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Archives pour la catégorie ‘Système’

HowTo: Make Ubuntu a Perfect Mac File Server and Time Machine Volume

15/03/2019 Comments off

ubuntu time machineFor quite some time I use my Ubuntu machine as a file and backup server for all Macs in my network which is perfectly accessible from the Finder in Mac OS X. There are some instructions available in the web for this task but all failed in my case so I wrote my own tutorial with all the steps needed for it to work properly.

So here’s my little Tutorial for connecting Mac OS X Leopard with Ubuntu and using your Ubuntu machine as a backup volume for Time Machine but all steps can be reproduced on every Linux box and they work with Mac OS X 10.4 Tiger too. At the end of this tutorial you will have a server which shows up in the Finder sidebar and behaves just like a Mac server when accessing it from your Macs. To be perfectly integrated with Mac OS X we’re going to use Apple’s Filing Protocol (AFP) for network and file sharing.

Although this Tutorial involves using the Terminal in Ubuntu and looks a bit geeky it’s very easy even for beginners. I have tried to explain all steps and Terminal commands so you may learn a bit about the Terminal too. At the end of the article you can download my Server Displays icon pack quickly made by me with custom icons for a Mac, Ubuntu and Windows server.

Personally I use a fresh installation of Ubuntu 8.04 Hardy Heron Desktop version (32bit on one machine, 64bit on the other) and Mac OS X Leopard (10.5.3 and later) to connect to them. On my Ubuntu boxes there’s no other file sharing protocol like samba (Windows sharing) or NFS activated.

Rumors are Apple will add some undocumented AFP commands with the Mac OS X 10.5.6 update which therefor won’t be supported by the current Netatalk package (and maybe never will). So be sure to check the latest comments on this article when the 10.5.6 update is out to see if this rumor is true and if there are problems caused by that.

Here are the steps involved in setting up your Ubuntu box as a Mac file server:

  1. Modify and install Netatalk (Open Source AFP implementation)
  2. Configure Netatalk
  3. Configure shared volumes (and Time Machine volume)
  4. Install Avahi (Open Source Bonjour implementation)
  5. Configure Avahi and advertise services
  6. Configure TimeMachine
  7. Conclusion, Problems and more informations
  8. Downloading and using the Server Display Icons
  9. Translations Of This Article

Lire la suite…

Categories: Système Tags: , , ,

Benchmark Your Webpage with Siege

15/03/2019 Comments off

Siege_Benchmark_WebpageA few articles ago, I wrote about using the “apachebench” or “ab” utility to benchmark your website (see: apachebench). Ab is a great tool, but since then, I have found and fallen in love with a new tool for benchmarking your website. This new tool is named “siege”.

Install Siege on CentOS 6

CentOS 6 has added the siege package to the CentOS EPEL (Extra Packages for Enterprise Linux) repository which makes installation easy using yum if you have the EPEL repository installed. If you need to install it still, you can do it using these quick steps:

# wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -Uvh ./epel-release-6-8.noarch.rpm
Preparing...                ########################################### [100%]
package epel-release-6-8.noarch is already installed

Once the EPEL repository is installed, you can go ahead and install the siege package:

# yum install siege

Using Siege to Benchmark Your Website

We can get really detailed usage information on the siege utility in the man pages. We can get a list of the switches that siege can use by using the –help option:

# siege --help
SIEGE 3.0.0
Usage: siege [options]
       siege [options] URL
       siege -g URL
Options:
  -V, --version             VERSION, prints the version number.
  -h, --help                HELP, prints this section.
  -C, --config              CONFIGURATION, show the current config.
  -v, --verbose             VERBOSE, prints notification to screen.
  -q, --quiet               QUIET turns verbose off and suppresses output.
  -g, --get                 GET, pull down HTTP headers and display the
                            transaction. Great for application debugging.
  -c, --concurrent=NUM      CONCURRENT users, default is 10
  -i, --internet            INTERNET user simulation, hits URLs randomly.
  -b, --benchmark           BENCHMARK: no delays between requests.
  -t, --time=NUMm           TIMED testing where "m" is modifier S, M, or H
                            ex: --time=1H, one hour test.
  -r, --reps=NUM            REPS, number of times to run the test.
  -f, --file=FILE           FILE, select a specific URLS FILE.
  -R, --rc=FILE             RC, specify an siegerc file
  -l, --log[=FILE]          LOG to FILE. If FILE is not specified, the
                            default is used: PREFIX/var/siege.log
  -m, --mark="text"         MARK, mark the log file with a string.
  -d, --delay=NUM           Time DELAY, random delay before each requst
                            between 1 and NUM. (NOT COUNTED IN STATS)
  -H, --header="text"       Add a header to request (can be many)
  -A, --user-agent="text"   Sets User-Agent in request
  -T, --content-type="text" Sets Content-Type in request

Copyright (C) 2013 by Jeffrey Fulmer, et al.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.

so, with these options in mind, allow me to demonstrate a few of the coolest siege options that I like best:

Lire la suite…

Categories: Système Tags: , ,

Guide to rsnapshot and incremental backups on Linux

14/03/2019 Comments off

1. Introduction

rsnapshot is a backup tool written in Perl that utilizes rsync as its back-end. rsnapshot allows users to create customized incremental backup solutions. This article will discuss the following: the benefits of an incremental backup solution, rsnapshot’s installation, its configuration, and usage examples.

2. Back-it up!

I was recently discussing with a colleague the benefits of backing up your data. My colleague was telling me how one of her customers had recently lost a rather lengthy article that they had been working on. I decided that this may be a good chance to experiment with my netbook and rsnapshot. For this tutorial, I’ll assume you have have 2 pieces of hardware: your host computer, and your destination equipment. I’ll be using an external hard drive for the majority of this post. However, I will briefly cover usage for backing up files over a LAN.

Backing up your data should not be the question to ask but rather how should I backup my stuff? What’s the best way? Well there are many different backup pathways you can take, including block level (dd, partimage), partition level (RAID and all its variations), file level (rsyncand its children applications). I’ll discuss two types of backups in the context of file-based backups.

Normal backups, or full backups, are self explanatory. Normal backups are one way of backing up ALL your files every time you perform a backup. One issue with utilizing a multiple normal backup scheme is that a normal backup takes up a considerable amount of space. For example, if you perform a full backup of a 250gig hard drive at 20% capacity, everyday for just one week (assuming that the amount of data does not fluctuate) will mean that you already have used 350gigs for only one week’s worth of backups. As you can see, that is not feasible in the long run. The other method that I prefer is the incremental backup method. An incremental backup consists of one full backup and then performing additional backups. These additional backups will only backup files that  have changed since the last backup. Instead of backing up your entire hard drive, only the specific files that have changed since the last backup are backed up. As you can probably imagine this is a much more efficient process. One tool that does this on *nix is rsnapshot.

3. What is rsnapshot?

rsnapshot, as mentioned earlier, is an incremental backup utility. In this tutorial, I will show you how to create a seven day rotation backup scheme using rsnapshot. Essentially, rsnapshot will create 1 full backup and then subsequent backups will backup only files that have changed. The true power of rsnapshot is its ability to utilize hard-links between each backup. Each backup will appear to be a full backup. In reality each new backup consists of newly created or updated files. rsnapshot can be used over a LAN and can also be ran from cron. In this tutorial, I’ll show both usage examples.

4. Installation

Installation of rsnapshot is pretty straightforward, simply run the following command:

On Debian (or Ubuntu):

apt-get install rsnapshot

On Fedora:

yum install rsnapshot

On ArchLinux:

pacman -S rsnapshot

Now let’s configure rsnapshot.

Lire la suite…

Categories: Logiciel, Système, Tutoriel Tags:

Rsnapshot

14/03/2019 Aucun commentaire

Introduction

Vous le savez maintenant, les sauvegardes sont indispensables… Sauvegardes. Nécessaires, mais facile à oublier, sauf si elles sont effectuées automatiquement.

Voici un tutorial qui décrit la procédure pour mettre en place une solution de sauvegarde automatique simple basée sur rsnapshot.

Rsnapshot est un script écrit en perl.

Il utilise Rsync (et ssh si vous le souhaitez) pour effectuer des sauvegardes à intervalle régulier.

Il est capable de réaliser des sauvegardes d’un systèmes de fichier ou bien de bases de données par l’intermédiaire de scripts.

Un des principaux avantages de rsnapshot est son extrême simplicité.

rsnapshot utilise les « hard link unix » pour :

  • Éviter de dupliquer inutilement les fichiers.
  • Faciliter la restauration.

rsnapshot crée l’illusion de plusieurs sauvegardes complètes, alors qu’il n’y a sur le système de fichier que la première et les différences éventuelles apparues entre cette dernière et les suivantes. Il s’agit d’une méthode de sauvegarde différentielle.

Dans ce tuto nous allons vous expliquer comment mettre en place la sauvegarde différentielle sécurisée d’un répertoire d’une machine distante.

Prérequis: Configuration de SSH et des clefs

Vous devez pouvoir vous connecter aux machines auxquelles vous allez vous connecter sans mot de passe:

Tout d’abord, il faut configurer ssh et importer la clef du serveur distant.

Je vais procéder comme dans ce tuto

Testez:

root@nas:~# ssh -p 10122 vanille
Linux vanille.zehome.org 2.6.32-5-amd64 #1 SMP Tue Jun 14 09:42:28 UTC 2011 x86_64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Thu Aug 11 08:07:48 2011 from nas.zehome.org
root@vanille:~#

Installation de rsnapshot

root@nas:~# apt-get install rsnapshot

Qui vous installera par la même occasion Rsync

Sauvegarde du fichier de configuration:

root@nas:~# cp /etc/rsnapshot.conf /etc/rsnapshot.conf.sos

Lire la suite…

Sauvegarde journalisée de votre machine avec RSnapShot

13/03/2019 Comments off

Source: Nicolargo

Ce logiciel libre permet d’automatiser une sauvegarde journalisée de vos machines et ceci localement comme à distance.

RSnapShot est disponible dans la plupart des dépôts des distributions GNU/Linux et *BSD. Nous allons illustrer cet article avec une installation et une configuration de RSnapShot sur un serveur Gandi sous Ubuntu 10.04 LTS.

Installation de RSnapShot

On utilise la version disponible dans les dépôts officiels:

sudo aptitude install rsnapshot

Configuration de RSnapShot

L’ensemble de la configuration est centralisé dans le fichier /etc/rsnapshot.conf.

sudo vi /etc/rsnapshot.conf

Attention à la syntaxe dans ce fichier, RSnapShot est assez pointilleux. Il veut que tout les répertoires finissent par un / et des tabulations entre chaque variables.

Les variables importantes à configurer sont les suivantes:

snapshot_root   /.snapshots/

La variable snapshot_root permet de configurer le répertoire racine ou les sauvegardes seront stockées. Ce répertoire peut être sur le même disque que le disque système (c’est le cas de la configuration par défaut avec l’utilisation du répertoire /.snapshots/).

Je vous conseille pour ma part d’utiliser si possible un répertoire stocké sur un deuxième disque physique. Par exemple sur mon serveur Gandi, j’ai un deuxième disque qui est monté sur le répertoire /srv/backup. Je vais donc configurer la variable à /srv/backup/snapshots/ (noter le / à la fin du répertoire !).

Exemple: snapshot_root /srv/backup/snapshots/

cmd_ssh /path/to/ssh

Si vous voulez utiliser les fonctions de sauvegarde de serveur distant (en utilisant le protocole SSH), il faut dé-commenter la ligne précédente. Si vous avez besoin de passer des arguments spécifique à SSH, il faudra compléter la ligne ssh_args.

Exemple: cmd_ssh /usr/bin/ssh

interval monthly 3

Activation de la sauvegarde mensuelle (désactivé par défaut).

On passe ensuite aux variables permettant de configurer ce que l’on veut sauvegarder.

Sauvegardes locales

On parle ici d’une sauvegarde journalisée de répertoires de la machine ou RSnapShot est installé.

backup /home/ localhost/

Le répertoire /home/ sera sauvegardé dans le sous répertoire $snapshot_root/localhost/.

Exemple:

backup /home/ localhost/
backup /etc/ localhost/
backup /var/svn/ localhost/

Lire la suite…

Categories: Logiciel, Système, Tutoriel Tags: ,