by March 10, 2007 0 comments



With the growing speed and capability of next-gen processors, it’s becoming
easier to run multiple OSes and servers on a single hardware server. This is
what we call Server Consolidation. And one of the key enablers for such
consolidation is Virtualization. That’s why our PCQLinux Enterprise Edition has
in-built support for Virtualization.

With virtualization you not only achieve consolidation but also get a new way
of deploying applications in the form of pre-configured virtual disk images.
Such an image can be deployed by attaching the hard-disk image to your virtual
machine and booting it up. It means that you can practically set up a fully
operational and configured server in just a few minutes.

PCQLinux 2007 Enterprise Server provides all these features out-of-the-box.
Not only has virtualization been provided in the form of VirtualBox, but we have
also provided you with two pre-configured virtual appliances for Collaboration
and Content Management. In this section, we will talk about how to get started
with VirtualBox and create and attach more virtual machines with it. We show you
how to use the appliances shipped with PCQLinux 2007, elsewhere in this story.


iSCSI Refresher

Configuring IP for the Host:
To configure an IP address for the host machine, you have to run the
ifconfig command and give the address manually. This is needed as tunctl
doesn’t work well with dhcp clients. For this issue the command:

#ifconfig eth0 you_ip_add
netmask 255.255.255.0 up

Attaching Appliances:
If you want to attach appliances shipped with the PCQLinux 2007 DVD, you
have to first go to the /mnt/cdrom/Appliances folder and copy the appliance
file to your hard-disk. Uncompress the file using the following command:

#bunzip2 appliance_name.bz2

This command will generate a .vdi file. You can
attach the .vdi file by the method described
in Step 5.

Configuration
To get VirtualBox running, you have to first install the PCQLinux Server. To do
so, you have to write ‘enterprise’ when you boot off the PCQLinux 2007 DVD. For
more info on how to install PCQLinux  2007 Server, read the section on ‘How
to install PCQLinux 2007.’

Once the server is installed, boot into the machine and again place the
PCQLinux 2007 DVD into the drive. Now go to cdrom:/Appliances/Required!/ folder
and you will see two more RPM files called parprouted-0.63-1.2.el4.rf.rpm and
uml-utilities-o.20040406-2.fc4.at.rpm. Install both the RPMs by running the
following commands:

#rpm -ivh parprouted-0.63-1.2.el4.rf.rpm –nodeps
#rpm -ivh uml-utilities-o.20040406-2.fc4.at.rpm –nodeps

Remember to use the nodeps switch else you might see some errors. Once this
is done, go to the /opt/virtualbox/bin/src folder and run the following commands
to compile and install VirtualBox binaries:

#make KERN_DIR=/usr/src/kernels/2.6.9-42.0.8.EL-i686/
#make KERN_DIR=/usr/src/kernels/2.6.9-42.0.8.EL-i686/
install

After this you have to run some more commands to enable the network in the
virtual machine. To do so first of all create a tap device, which is a virtual
Ethernet device that can communicate with the Ethernet card of a virtual
machine. You can do so by running the following command:

#tunctl —t tap0

If you see the output that says, ‘Set tap0 persistent and owned by uid 0,’
then your tap device is ready to work. Now you have to create a route between
the physical Ethernet card in your server and the tap0 device. You can do so by
running the following command:

#parprouted eth0 tap0

Now the only one thing required is to get your virtual machine to run. For
this you have to enable IP forwarding in your machine so that the virtual
machine sitting inside VirtualBox is able to access your physical network. You
can do so by running the following command:

#echo 1 > /proc/sys/net/ipv4/ip_forward

Now the entire configuration is over and you just need to start VirtualBox.
For this you have to run a few commands. First of all, load the drivers required
for VirtualBox to run properly. This can be done through the command:

#modprobe vboxdrv

Once this is done, start the VirtualBox server by running the following
command from /opt/virtualbox/bin/ directory:

#./VBoxSVC &

Running the GUI
As VirtualBox has a very comprehensive, graphical interface and the PCQLinux
2007 Enterprise Edition doesn’t have any X windows running; you must be
wondering how we are going to actually run VirtualBox. Don’t worry; we don’t
expect you to use VirtualBox from the command line only.
Instead the idea here is to use SSH with X windows exported and running the GUI
from some other machine. For this, go to any Linux machine where you have
Xwindows installed and have an SSH client running. Run the following command:

#SSH —X ip_add

Here, replace the ip_add with the IP address of the Server where you have
PCQLinux Enterprise Server running. A standard SSH terminal will open, but using
the —X switch you have enabled the X Server of the Enterprise Edition to get
exported to the client machine.
So, whenever you run a command which requires X, it will automatically connect
to X Server of the client machine and start up the application there itself. To
start VirtualBox from the SSH terminal, run the following command:

#./VirtualBox

A cool looking window will open, where you can create, run and configure
virtual machines. Follow the screen shots stepwise to use the VirtualBox GUI.



In
this screen of VirtualBox, select the type of guest OS you are going to
install and give it a suitable name

Here provide the amount of RAM you want to dedicate to the guest OS


Here select
the first option if you want to create a dynamically growing Hard disk else
select the second option
If you have
opted for creating a new disk then you have to give it a size in this screen


If you have
selected to use a pre-existing disk in step 3, then locate and attach the .vdi
file here

When you are through with all the settings, click on the start button. Your
Virtual machine is now ready to run

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