I don’t often write something to my blog, mostly because I can’t find the time or the subject to write about, or the subject I can disclose to the public that is ^^. Anyway, I want to bust two bugs in one slap. That is writing something that is helpful to anyone interested and also for an archive of my projects. Often I start a personal project, mostly it doesn’t get completed because i get pulled of due other projects that actually bring food on the table. But this time I’m approaching it from another direction. Making my projects public for anyone to read. This keeps me motivated to complete the project and hopefully get some nice feedback from it.

My first project I’m posting is installing Xen 3.0.3 on a fresh server. Recently I’ve sold my webhosting company because I did not have the time, nor the long-term motivation for it. I’ve sold the company including the servers. But I managed to keep one server for myself and friends. This server is going to be used in this project so that I and my friends can have their own Virtual Machine.

Note that this is entirely new for me, and I don’t have any experience on virtualization what so ever, if you can provide me with any helpful feedback it will be appreciated

For some reason I have chosen to use Xen, why I don’t know exactly, other then its open source and according to the manual very easy to setup. I did look into other possibilities but it seems Xen is the most complete, and free software for virtualization. Also build by some of the most experienced companies out there, that gives me a big boost in confidence on support, communities etc.

I will update this post frequently on the status of the installation, how I did it and a complete log of installation commands that worked for my server. So if this post intrigues you, bookmark it!

Project is finished. This website is now running on a Virtual Machine!

I’ve chosen to use CentOS 5 because I’m familiar to this operating system and it’s easy to use. I’m using this OS for my dom0 setup, and also for the clients (domU).

Just got back from the datacenter, picked up the server I’m going to use for this project! After 2 years non-stop serving websites I thought let me clean the inside from dust, but surprisingly there was none.. at all..

Attempted to install a clean CentOS 5 installation with the netinstall ISO, appears my dvd-rom is broken, replaced it with new one; The DVD itself is not OK, that was my last one.. Need to get to the store later. me 0 – 1 preparation.

Today I configured the RAID, I’ve chosen for RAID10 with 4x 250GB hdd’s. This gives me 500GB disk space and a mirror for safety Building the array obviously took a long time. Got new CD’s, burned the netinstall ISO and booted the installation thought a HTTP mirror, works like a charm. But there seems to be an error with the GRUB loader after installation, I tried to fix it for a couple of hours, google-d my ass off but can’t seem to fix the problem. Called in the help of a friend who happens to be an expert in my eyes. Waiting for him to arrive and hopefully he knows how to fix it.

Problem turned out to be the RAID10 configuration, somehow CentOS doesn’t ‘take’ it. Also Ubuntu doesn’t like the RAID 10 configuration. Now i configured 2 times RAID1 for all 4 disks. Still gives me 500GB of storage, and mirrors. Installed CentOS 5.4 thought netinstall, now installing Xen.

– Well, installing Xen was pretty much easy. These are the steps i made:

I want to store all my VM’s on a big disk, for me that was the root disk. I created a folder on /data/vms/ for my virtual machines. After that I simply ran:

yum install kernel-xen xen

This installs Xen and the xen kernel. And it automatically adds the kernel to the Grub boot menu. You do have to make sure it’s set as default so it will boot that kernel on startup.

nano /boot/grub/menu.lst

Change the value of default to 0 (make sure the xen kernel is above other’s).

Reboot your system,

shutdown -r now

And it should boot from the new Xen kernel now!

To check if it is, run

[root@server ~]# uname -r
2.6.18-164.15.1.el5xen
[root@server ~]#

And we are done. We can setup virtual machines (domains) now.

That was pretty simple too, Xen comes with a tool that prompts you with the questions. You only have to enter the name and path basically for Xen to setup the VM. Type:

virt-install --prompt

When Xen ask’s for the Install URL you can use the images for your prevered flavor of linux, or what ever OS you want to install. I used CentOS for my first VM.

After installation, if you want to automatically boot your VM type on the domain-0:

ln -s /etc/xen/<vmname> /etc/xen/auto

For a list of Xen commands you can visit: http://xen-tools.org/software/xen-shell/commands.html

Well, it was a fast project for sure, all went easy as h*ll, except for the RAID10 issue. But everything is running smoothly and I have 3 VM’s running on the machine. Going to set it up in the datacenter again somewhere next week, And migrating this website to it! Thank you for reading, commenting is allowed And since it’s Queens Day here in Holland, im out partying now, bye!

• Installing Subversion
• Installing Trac
• Configuring Apache and Authentication

So, lets begin with installing Subversion. I used the Yum package manager but whether you install it from source or not doesn’t matter that much. We are going to need the packages ’subversion’ and ‘mod_dav_svn’, the last one is for serving Subversion repositories through Apache HTTP Server, which i assume you already have installed.

[root@repobox ~] yum install mod_dav_svn subversion

Thats basicly it for installing, the configuration was where i lost time, now lets continue installing Trac.

I installed Trac also again in combination with Apache, now we need python and mod_python:

[root@repobox ~] yum install python mod_python

And we need the mysql-python plugin so python can connect to MySQL, you can download the tarball from http://sourceforge.net/projects/mysql-python, then compile the package:

[root@repobox ~] tar xvzf mysql-python-tarball
[root@repobox ~] cd mysql-python-dir
[root@repobox ~] python setup.py build && python setup.py install

Install Clearsilver, this is a templating package used by Trac, you can download it from http://www.clearsilver.net/downloads/

[root@repobox ~] tar xvzf clearsilver-tarball
[root@repobox ~] cd clearsilver-dir
[root@repobox ~] ./configure –with-python=/path/to/python && make && make install

Usually the python path is /usr/lib/python2.4 or whatever version you installed

When you have installed all of the above we can continue with installing Trac, first download Trac from http://trac.edgewall.org/wiki/TracDownload

[root@repobox ~] tar xvzf trac-tarball
[root@repobox ~] cd trac-dir
[root@repobox ~] python ./setup.py install

All done, now we can configure both subversion and Trac with Apache, and create some user authentication.

We are going to create config files for apache, vhost and trac:

[root@repobox ~] cd /etc/httpd/conf.d/
[root@repobox ~] touch vhosts.conf

Now, nano subversion.conf and put in the following:

   DAV svn
   SVNParentPath /var/www/svn

   # Limit write permission to list of valid users.

      AuthType Basic
      AuthName "SVN Authorisation"
      AuthUserFile /etc/svn_trac-auth-conf
      Require valid-user

This allows you to view the repository’s using http://example.org/repos

Now first lets create a svn repository

[root@repobox ~] svnadmin create /var/www/svn/projectname
[root@repobox ~] chown -R apache.apache /var/www/svn/projectname

And a trac project to go along with it

[root@repobox ~] trac-admin /var/www/trac/projectname initenv
[root@repobox ~] chown -R apache.apache /var/www/trac/projectname

Now lets add some security

[root@repobox ~] touch /etc/svn_trac-auth-conf
[root@repobox ~] htpasswd -m /etc/svn_trac-auth-conf username

Now trac has been setup, lets create a apache link to it:

[root@repobox ~] nano /etc/httpd/conf.d/trac.conf

Add the following:

        SetHandler mod_python
        PythonInterpreter main_interpreter
        PythonHandler trac.web.modpython_frontend
        PythonOption TracEnv /var/www/trac/projectname
        PythonOption TracUriRoot /trac/projectname

Now you can open trac on http://example.org/trac/projectname