Archive for November, 2006

Installing Xen on Debian Etch 4.0

For a long time I have tested many different virtualization techniques; Xen, VMWare, and Microsoft VM. Until now I’m able to conclude that all of them are usable on my desktop machine, but bothVMWare and Microsoft’s VM are more sluggish that Xen. This weekend I deployed my first server based on the upcoming Debian Etch andXen. Everything worked out of the box.

Here is what I did to install Xen on Debian Etch:

sudo apt-get install xen-linux-system-2.6.18-4-xen-686 libc6-xen bridge-utils

Boot into the newly installed Xen enabled Linux kernel

sudo reboot

Then adjusted the network settings in /etc/xen/xend-config.sxp. Enabling the network bridge:

(network-script network-bridge)

Install xen-tools:

apt-get install xen-tools

Xen tools is a collection package containing different tools related to Xen, a virtual machine creator etc.

Edit adjust the kernel and initrd parameters in /etc/xen-tools/xen-tools.conf to match the ones on your system:

Find out what the kernel image and initrd is named by:

ls /boot/vmlinuz*
/boot/vmlinuz-2.6.18-4-686 /boot/vmlinuz-2.6.18-4-xen-686


ls /boot/initrd*
/boot/initrd.img-2.6.18-4-686 /boot/initrd.img-2.6.18-4-686.bak /boot/initrd.img-2.6.18-4-xen-686

Adjust the lines

# Default kernel and ramdisk to use for the virtual servers
kernel = /boot/vmlinuz-2.6.18-4-xen-686
initrd = /boot/initrd.img-2.6.18-4-xen-686

Further adjust the xen-tools.conf to this settings:

dir = /home/xen
debootstrap = 1
size = 4Gb # Disk image size.
memory = 128Mb # Memory size
swap = 128Mb # Swap size
fs = ext3 # use the EXT3 filesystem for the disk image.
dist = etch # Default distribution to install.
image = sparse # Specify sparse vs. full disk images.

Create a home for all the coming virtual Xen guests:

mkdir /home/xen
mkdir /home/xen/domains

And then ready to create a virtual machine – guest, simply by:

xen-create-image -hostname=mailserver -ip= -netmask= -gateway= -passwd

Afterwards I was able to fire up the newly created virtual machine with:

xm create mailserver.cfg

If an error like this shows up

Error: Device 0 (vif) could not be connected. Backend device not found.

You should check your that you have enabled the network bridge, “(network-script network-bridge)”, in /etc/xen/xend-config.sxp and restarted the xen deamon by /etc/init.d/xend restart

When up and running either “xm list” or “xentop” can be used to get an overview of what instance are currently running

debian5:# sudo xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0      874     1 r-----    657.9
mailserver                                 3      128     1 -b----      8.0

Based on my experiences so far with virtualization and deploying virtualization in a enterprise setup, I really think that Xen is a very strong asset for Linux and Linux based distributions to show the world what they are up to. Virtualization is really a technique for enterprise server and data center managers to make a more robust and simplified setup, and I think that virtualization could play a significant role within the server market the coming years.