Debian Lenny xen server setup
This guide describes the way I intalled my home server. The server is a Debian Lenny installation containing a variaty of virtual servers. The virtualisation is done by xen. This guides describes the proceses needed, commands issued and so on.
Good luck!
Step 1 - Basic installation
First install a minimal Lenny from a network boot machine.
(I assume you will manage this without desciption)
Step 2 - Change settings
We need to change the IP address of the server as we want it to have a static address (instead of an address issued by DHCP):
# nano /etc/network/interfaces
Change the following parts of this file
[...] # The primary network interface allow-hotplug eth0 iface eth0 inet static address 192.168.2.201 netmask 255.255.255.0 network 192.168.2.1 broadcast 192.168.2.255 gateway 192.168.2.1 # IPtables settings [...] |
Now restart the network device:
# ifdown eth0 # ifup eth0
Now we need to install the ssh-server to make maintainance a bit easier:
# apt-get install openssh-server
Step 3 - Install xen
Finally it is time to install our mighty xen:
# apt-get install xen-hypervisor-i386 linux-image-2.6-xen-686 linux-headers-2.6-xen-686 xen-utils-3.2-1 xen-tools bridge-utils
To make the consoles work we also need to make some changes to the inittab:
# nano /etc/inittab
Step 4 - Edit xen to make it work properly
After the installation there are still a few adjustments to make in order to get it running smoothly. Firstly we make the consoles work. Therefore we need to make some changes to the inittab:
# nano /etc/inittab
Change the following parts of this file
[…] # 1:2345:respawn:/sbin/getty 38400 hvc0 2:23:respawn:/sbin/getty 38400 tty1 #3:23:respawn:/sbin/getty 38400 tty3 #4:23:respawn:/sbin/getty 38400 tty4 #5:23:respawn:/sbin/getty 38400 tty5 #6:23:respawn:/sbin/getty 38400 tty6 […] |
Also edit the /etc/xen/xend-config.sxp
# nano /etc/xen/xend-config.sxp
See the desciption on: http://www.howtoforge.com/virtualization-with-xen-on-debian-lenny-amd64
Next edit the xen-tools.conf
# nano /etc/xen-tools/xen-tools.conf
See the desciption on: http://www.howtoforge.com/virtualization-with-xen-on-debian-lenny-amd64
Finally we also need to make some adjustments to prevent the famous “clocksource/0: Time went backwards” error (or similar problems) by not using the xen clock. First we need to install ntp on the dom0:
# apt-get install ntp
Also see: http://wiki.debian.org/Xen
Then, later, we also have to take some steps into account for the domU, but we see about them later!
Now it is time to load our new (xen)kernel. Therefore, reboot the server:
# reboot
Step 5 - Create a domU (virtual server)
Let's create a dumU:
# xen-create-image --hostname=<DOMAIN>.hanckmann.net --size=4Gb --swap=256Mb –ip=192.168.2.<IP ADDRESS> --memory=128Mb --arch=i386 –role=udev
For example:
# xen-create-image --hostname=apache.hanckmann.net --size=4Gb --swap=256Mb --ip=192.168.2.211 --memory=128Mb --arch=i386 –role=udev
Before we do anything else, we first prevent the famous “clocksource/0: Time went backwards” error. Edit the *.cfg file of the created domU domain:
# nano /etc/xen/<DOMAIN>.hanckmann.net.cfg
Now add (or expand) the extra line:
[…] extra=”clocksource=jiffies” […] |
This domU runs a standard Debian Lenny installation on the i386 platform with 4Gb disk space, 256Mb swap space and 128Mb memory.
Step 6 - Start the domU
Now it is time to start this domU. This is done via the command "xm create ...cfg". In my example I would issue the command:
# xm create /etc/xen/apache.hanckmann.net.cfg
Check if the domU managed to start by typing:
# xm list
The domU should be in that list.
To work with the domU we have to connect to its console. We do this via:
# xm console apache.hanckmann.net
Step 7 - Adjusting the domU
The domU needs some minor adjustments to make it work nicely. First we, again, go on to prevent the famous “clocksource/0: Time went backwards” error. Type:
# nano /etc/sysctl.conf
and add the line:
[…] xen.independent_wallclock=1 […] |
Now install the ntp client on this machine:
# apt-get install ntp
To activate the changes without a reboot perform the following steps:
# sysctl -p # echo "jiffies"> /sys/devices/system/clocksource/clocksource0/current_clocksource
Besides this it is a good idea to generate an rsa key so you can ssh into your virtual machine (sshserver is installed by default):
# ssh-keygen
You can also simply reboot the domU.
Step 8 - Exit the domU environment
To exit the domU environment type CTRL + ]
Step 9 - Read the following information sources
- The xm manual page (man xm)
- http://www.howtoforge.com/virtualization-with-xen-on-debian-lenny-amd64
- http://wiki.debian.org/Xen
- patrick's blog
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