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.
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/
Install git 1.6 from source on debian etch
aptitude install build-essential gettext wget http://kernel.org/pub/software/scm/git/git-1.6.0.1.tar.gz tar xvzf git-1.6.0.1.tar.gz cd git-1.6.0.1 ./configure make make install
Fetchmail and Sieve with Virtual Mail on Debian Etch
Update: This post is quite old and does not work out of the box with the current ISPMail tutorials. I posted an update here.
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.
