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Knowledge Base

Mammoth VPS supports the use of PV-Grub, a component of Xen that allows customers to run the linux kernel of their choice. The majority of our installations now use this by default, but some customers with VPS from 2012 or earlier may not be set up for PV-Grub.

This is an advanced procedure and should generally only be attempted by users with a good knowledge of linux. What follows is an example of how you would set up a new Ubuntu 10.04 LTS VPS so that it uses PV-Grub to run a kernel that is not provided by Mammoth VPS.

VPS Setup

After logging in with SSH execute the following commands. First, make sure your APT repositories are up to date:

sudo apt-get update

Next, install the current Ubuntu kernel:

sudo apt-get install linux-image-virtual

When prompted, leave the command line blank and answer 'yes' to continue without installing grub2. We need the 'legacy' Grub v1, instead of the now default version 2 of Grub:

sudo apt-get install grub

Next, we create the initial /boot/grub/menu.lst (answer 'yes' when prompted):

sudo update-grub

Now edit menu.lst and change the value of groot to suit Mammoth VPS. Find the line # groot=<some GUID> and change it to # groot=(hd1)

sudo apt-get install nano
sudo nano /boot/grub/menu.lst

You do not need to uncomment it; the groot line is used as a template. Now, apply our change to groot:

sudo update-grub

 

Selecting the PV-Grub Kernel

Now that your Ubuntu VPS has a custom kernel set up, you need to select PV-GRUB within mPanel:

  1. Login to the VPS list in mPanel and click "Manage" next to the VPS you just modified.
  2. In the kernel section at the bottom right, select "Distribution Kernel" .
  3. Click "Save"
  4. Click "Restart VPS"

Testing the Configuration

After the VPS is restarted, you should be able to log in to it and if you type "uname -r" you should see something similar to "2.6.31-24-generic-pae" instead of "2.6.32.12-mammoth1". This means that the VPS is successfully using the kernel that was just installed.

 

Debian 5.0 Differences

  • The package name is linux-image-xen-686 instead of linux-image-virtual
  • Debian 5.0 does not have Grub2, so you can are not required to prevent its installation.
  • You are required to mkdir /boot/grub as Debian's update-grub will not create it for you.
  • Debian's update-grub does not handle our Xen device setup without a small modification - see http://www.kromhouts.net/blog/?p=24

 

 

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