Repack a .deb-archive with dpkg-deb

I just needed to repack a Debian package to solve this problem. After a quick spin to #debian I got this solution:

$ mkdir -p extract/DEBIAN
$ dpkg-deb -x package.deb extract/
$ dpkg-deb -e package.deb extract/DEBIAN
[...do something, e.g. edit the control file...]
$ mkdir build
$ dpkg-deb -b extract/ build/
  • -x extracts the package contents
  • -e extracts the control files
  • -b builds the new package

Done.

Set up a Zend Framework application using Zend_Application (including PHPUnit setup)

Today I spent some time setting up a new Zend Framework application using ZF 1.8.0 Beta 1 and the new component Zend_Application. Using that component, all bootstrapping is done by Zend_Application_Bootstrap and so-called resource plugins. Such resource plugins are responsible for initialization of single components such as front controller, database or the view. This way, the whole bootstrapping is nicely modularized and keeps some headache away. In addition, the majority of settings can be set in the application config file. As I ran into some issues, I’d like to note the required steps and hope that it’s useful so someone. I won’t explain the files in detail, you can find enough information about components and parameters on the manual and the quickstart, but you should get to a working setup with just copy&pasting the code here ;)

Basically a big part of this setup can be done using the new Zend_Tool CLI, however I had some problems setting it up, so I’ve done it manually (however most of the code is the one generated by Zend_Tool).

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Upgrade from Debian Etch/Xen 3.0 to Debian Lenny/Xen 3.2 (AMD64)

I was running a Xen server with Debian Etch as dom0 (Linux 2.6.18-6 with Xen 3.0.3-1 on AMD64) for some time now. Today, I decided to upgrade the dom0 to Debian Lenny (Linux 2.6.26-2 with Xen 3.2.1-2). The domUs are all running a Debian-based OS (3x Lenny, 1x Ubuntu Hardy). The upgrade was quite straightforward, however there were some pitfalls you can avoid in advance.

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Authenticate Apache against Redmine with AuthMySQL

For a student project we needed to authenticate an apache host against a MySQL database, in this a case we wanted to handle authentication for a Subversion repository with a Redmine database. I know that Redmine has its own solution for this problem using Redmine.pm, but for some reason that approach didn’t work and we didn’t have the time to bug around with it. This howto is written for the use with Redmine (especially the database view), but you should get the point how to set it up on other environments. The howto was done on an Ubuntu 8.10 box but should work on any other distro as well (except for the module installation). I assume that you got all the other stuff (apache, mysql, …) up and running.

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gitosis-create-repo

A simple script to create a new gitosis-repository on the fly. I’m not really familiar with bash scripting so don’t expect too much ;)

#!/bin/bash
if [ -z $1 ]; then
    echo "Please specify a repository."
    exit 1
fi

if [ -z $2 ]; then
    echo "Please specify a remote url."
    exit 1
fi

if [ -d $1 ]; then
    echo "Repository already exists."
    exit 1
fi

mkdir $1
cd $1
git init
touch .gitignore
git add .gitignore
git commit -a -m "Initial commit."
git remote add origin $2:$1.git
git push origin master:refs/heads/master

Please make sure you set the correct permissions in gitosis.conf. Example:

[group me]
members = me@example.com
writable = test</pre>

Then you can run the script to create a new repository test on myhost.example.org:

$ gitosis-create-repo test git@myhost.example.org

Set up symfony 1.2 on Debian/Ubuntu

Just wanted to give symfony a try and ran into some issues to set it up the way I wanted. Therefore I’d like to note the required steps.

First, install symfony via PEAR.

pear channel-discover pear.symfony-project.com
pear install symfony/symfony-1.2.4

This sould install symfony and make the symfony executable available in your PATH.

~$ symfony -V
symfony version 1.2.4 (/usr/share/php/symfony)

Create a directory for your vhost and create a new project.

mkdir /var/www/myproject
cd /var/www/myproject
symfony generate:project myproject

Create an example application in your project.

symfony generate:app frontend

Link the symfony resources to the project’s document root.

cd web
ln -s /usr/share/php/data/symfony/web/sf/

This should get you up and running with symfony. You just need to configure your server for the vhost. For personal preference, I’d like to have my document root directory named public instead of web. The following steps are needed to achive this.

Rename the document root directory.

mv web public

Add this line to config/ProjectConfiguration.class.php:

<?php
public function setup()
{
    $this->setWebDir($this->getRootDir() . '/public');

    // for compatibility / remove and enable only the plugins you want
    $this->enableAllPluginsExcept(array('sfDoctrinePlugin', 'sfCompat10Plugin')$
}

Linux Software RAID1 defekte Platte tauschen

Da auf meinem Rootserver zum wiederholten Mal Probleme mit der zweiten Festplatte (/dev/sdb) auftraten, wurde diese soeben im Rechenzentrum getauscht (ein Lob an Hetzner für den schnellen Support). Da die Platte Bestandteil eines Software RAID1-Verbunds ist, kurz die Schritte zum Entfernen und anschließenden Reaktivieren der Platte.

Zuerst alle Partitionen der Platte auf faulty setzen und anschließend aus dem jeweiligen Array entfernen:

mdadm /dev/md0 --set-faulty /dev/sdb1
mdadm /dev/md0 --remove /dev/sdb1
mdadm /dev/md1 --set-faulty /dev/sdb2
mdadm /dev/md1 --remove /dev/sdb2
mdadm /dev/md2 --set-faulty /dev/sdb6
mdadm /dev/md2 --remove /dev/sdb6

Nach dem Tausch der Platte muss zuerst die Partitionstabelle auf die neue Platte kopiert werden:

sfdisk -d /dev/sda | sfdisk /dev/sdb 

Anschließend können die Partitionen wieder zu den jeweiligen Arrays hinzugefügt werden:

mdadm /dev/md0 --add /dev/sdb1
mdadm /dev/md1 --add /dev/sdb2
mdadm /dev/md2 --add /dev/sdb6

Über folgende Ausgaben kann der Resync der Arrays dann überprüft werden:

mdadm --detail /dev/md2
cat /proc/mdstat

Debian logcheck ignore file for sSMTP

On a server, I use logcheck to get an email based on logfile analysis if anything goes wrong and doesn’t fit the usual patterns. In addition, I use sSMTP to forward all sent mails to my mailserver. Unfortunately, this solution ends up in sending a mail like the following every hour because of a bug in logcheck’s ignorefile for sSMTP.

Dec 12 22:02:06 hostname sSMTP[22391]: Sent mail for logcheck@hostname (221 2.0.0 Bye) uid=101 username=logcheck outbytes=639

To fix this, I replaced the contents of the file /etc/logcheck/ignore.d.server/ssmtp with the following lines:

^w{3} [0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} [a-zA-Z0-9]+ sSMTP[[0-9]+]: Sent mail for logcheck@.*$
^w{3}  [0-9] [0-9]{2}:[0-9]{2}:[0-9]{2} [a-zA-Z0-9]+ sSMTP[[0-9]+]: Sent mail for logcheck@.*$

I removed the other lines, because sSMTP shouldn’t do anything else on the system and if it would, I’d like to be informed. If you need more ignore patterns you might have to keep/edit some of the original lines.

Debootstrap a Ubuntu Hardy DomU on a Debian Etch Xen Dom0

Lately, I wanted set up a Ubuntu Hardy DomU on an existing Debian Etch Dom0 box. Usually, setting up Debian-based DomUs is very simple with xen-create-image and debootstrap (there are tons of tutorials out there dealing with this topic), but unfortunately Etch’s version of debootstrap doesn’t support Ubuntu Hardy. I spent a surprisingly long time on searching the net until I found a solution for this problem on a french site: Installer et configurer Xen sur Debian 4.0 Etch (it’s a complete howto for Xen on Debian Etch, but it deals with the Hardy part too). The author created a backport of the debootstrap package, which enables you to debootstrap Hardy.

First, you have to create the hardy.d directory (symlink) for xen-tools.

$ cd /usr/lib/xen-tools
$ ln -s ubuntu.d hardy.d

There’s a debian repository holding the backport package, however I got problems to use that repository on an amd64 box, so I downloaded and installed the package manually.

$ wget http://falcon.landure.fr/pool/etch/debootstrap/debootstrap_1.0.10_all.deb
$ dpkg -i debootstrap_1.0.10_all.deb

Now you should be able to debootstrap a Hardy DomU.

$ xen-create-image 
--hostname=hardy 
--ip=xxx.xxx.xxx.xxx 
--size=5Gb 
--memory=256Mb 
--dist=hardy 
--mirror=http://archive.ubuntu.com/ubuntu/

Fetchmail and Sieve with Virtual Mail on Debian Etch

When it comes to mail servers, I really like the setup Christoph Haas describes in his Document Howto: ISP-style Email Server with Debian-Etch and Postfix 2.3. One thing I was missing on a server was the ability to automatically generate config files for fetchmail and sieve from the database in order to get mail from other servers and being able to apply server side filters on incoming mail. This howto is based on the mentioned tutorial.

The additional setup is quite simple: 2 more database tables hold the data for fetchmail and sieve rules and a set of PHP scripts called by cron every few minutes fetches the data and writes it into the appropriate config files. For fetchmail, a script creates a .fetchmailrc file in /home/vmail/. For sieve, another script creates a .dovecot.sieve config file for every user who got sieve rules in the database.

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