Difference between revisions of "Create Alpine Linux PV DomU"

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(Install the guest)
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To create an Alpine Linux PV DomU you will need a Dom0 and an Alpine Linux iso, here we will use the "mini" iso.
+
To create an Alpine Linux PV DomU you will need an Alpine Linux iso.
  
== Copy the kernel ==
+
Download the latest and greatest iso from the [http://alpinelinux.org/ Alpine Linux] website.
The first step it to mount the image and extract the kernel and initramfs:
+
 
 +
== Extract the xen-aware linux kernel ==
 +
 
 +
Next, mount the iso and extract the kernel and initramfs:
  
 
<pre>
 
<pre>
Line 13: Line 16:
 
</pre>
 
</pre>
  
Now we have the kernel at /path/to/save/kernel/grsec and the initramfs at /path/to/save/kernel/grsec.gz.
+
Now we have the kernel in /path/to/save/kernel/grsec and initramfs in /path/to/save/kernel/grsec.gz.
  
 
== Create the disk image ==
 
== Create the disk image ==
Now we should create an empty file, that will be the hard drive of the DomU, you can also use a physical partition if you like (in this example we are using a 3GB disk):
+
Now we should create an empty file, that will be the hard drive of the DomU (in this example we are using a 3GB disk):
  
 
<pre>
 
<pre>
Line 22: Line 25:
 
</pre>
 
</pre>
  
== Configure for booting ISO image ==
+
== Create a DomU config file that boots the ISO image ==
The next step is to create a basic configuration file, so we can launch the DomU (save it where you like, although the most common place is /etc/xen/).
+
The next step is to create a basic DomU configuration file, so we can launch the pv guest iso (save it where you like, although the most common place is /etc/xen/).
  
 
<pre>
 
<pre>
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# Path to HDD and iso file
 
# Path to HDD and iso file
 
disk = [
 
disk = [
         'format=raw, vdev=xvdc, access=r, target=/path/to/disk.img',
+
         'format=raw, vdev=xvda, access=w, target=/path/to/disk.img',
 
         'format=raw, vdev=xvdc, access=r, devtype=cdrom, target=/path/to/the/iso'
 
         'format=raw, vdev=xvdc, access=r, devtype=cdrom, target=/path/to/the/iso'
 
       ]
 
       ]
Line 82: Line 85:
  
 
Installation is complete. Please reboot.
 
Installation is complete. Please reboot.
 +
 +
# halt
 +
 
</pre>
 
</pre>
  
# halt
+
== Adjust the domU config file to boot from fresh install ==
 +
 
 +
In your Dom0, edit your DomU config file to boot from the fresh install
  
== Adjust domU config file for booting from disk ==
 
As the installation suggests, halt the DomU machine and edit the config file, to remove the xvdc disk (iso image), and change to use pvgrub. At the end it should look similar to this:
 
  
 
<pre>
 
<pre>
 
# Alpine Linux PV DomU
 
# Alpine Linux PV DomU
  
bootloader = '/usr/bin/pygrub'
+
# Kernel paths for install
 +
kernel = "/path/to/save/kernel/grsec"
 +
ramdisk = "/path/to/save/kernel/grsec.gz"
 +
extra="modules=sd-mod,usb-storage,ext4,squashfs console=hvc0 root=/dev/xvda3"
 +
 
  
 
# Path to HDD and iso file
 
# Path to HDD and iso file
 
disk = [
 
disk = [
         'file:/path/to/disk.img,xvda,w',
+
         'format=raw, vdev=xvda, access=w, target=/path/to/disk.img'
        ]
+
      ]
  
 
# Network configuration
 
# Network configuration
Line 103: Line 113:
  
 
# DomU settings
 
# DomU settings
memory = 128
+
memory = 512
 
name = "alpine"
 
name = "alpine"
 
vcpus = 1
 
vcpus = 1
 +
maxvcpus = 1
 
</pre>
 
</pre>
  
So now you are good to go, you can boot into your new Alpine Linux DomU:
+
==Adding a grub config file to boot with pvgrub==
 +
 
 +
Now boot the VM once more to add a grub.conf file so that we may load the xen-aware kernel from within the VM.
 +
 
 +
This means that upgrading the kernel will not mean copying it to the dom0.
  
 
<pre>
 
<pre>
 
# xl create -f /path/to/conf -c
 
# xl create -f /path/to/conf -c
 
</pre>
 
</pre>
 +
 +
Log in as root and create the file /boot/grub.conf with the following content
 +
 +
<pre>
 +
 +
#/boot/grub.conf
 +
 +
default 0
 +
timeout 5
 +
 +
title alpine-xen-pv
 +
root (hd0,0)
 +
kernel /boot/grsec modules=sd-mod,usb-storage,ext4,squashfs console=hvc0 root=/dev/xvda3
 +
initrd /boot/grsec.gz
 +
 +
</pre>
 +
 +
Halt your VM one last time
 +
 +
<pre>
 +
# halt
 +
</pre>
 +
 +
==Adjust the DomU config file one last time to use pvgrub==
 +
 +
Your final xen DomU config file should look something like this.
 +
 +
<pre>
 +
# Alpine Linux PV DomU
 +
disk = [
 +
        'format=raw, vdev=xvda, access=w, target=/path/to/alpine.img'
 +
        ]
 +
 +
kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
 +
extra="(hd0,0)/boot/grub.conf"
 +
 +
vif = [ 'bridge=br0' ]
 +
memory = 1024
 +
name = "alpine"
 +
vcpus = 1
 +
maxvcpus = 1
 +
 +
</pre>
 +
 +
When you next boot, you will be presented with the grub boot menu, and your VM will boot.
  
 
[[Category:Virtualization]]
 
[[Category:Virtualization]]

Revision as of 15:01, 11 June 2014

To create an Alpine Linux PV DomU you will need an Alpine Linux iso.

Download the latest and greatest iso from the Alpine Linux website.

Extract the xen-aware linux kernel

Next, mount the iso and extract the kernel and initramfs:

# mkdir -p /mnt/alpine_iso
# mount -o loop /path/to/the/iso /mnt/alpine_iso
# cp /mnt/alpine_iso/boot/grsec /path/to/save/kernel/
# cp /mnt/alpine_iso/boot/grsec.gz /path/to/save/kernel/
# umount /mnt/alpine_iso
# rmdir /mnt/alpine_iso

Now we have the kernel in /path/to/save/kernel/grsec and initramfs in /path/to/save/kernel/grsec.gz.

Create the disk image

Now we should create an empty file, that will be the hard drive of the DomU (in this example we are using a 3GB disk):

# dd if=/dev/zero of=/path/to/disk.img bs=1M count=3000

Create a DomU config file that boots the ISO image

The next step is to create a basic DomU configuration file, so we can launch the pv guest iso (save it where you like, although the most common place is /etc/xen/).

# Alpine Linux PV DomU

# Kernel paths for install
kernel = "/path/to/save/kernel/grsec"
ramdisk = "/path/to/save/kernel/grsec.gz"
extra="alpine_dev=xvdc:iso9660 modules=loop,squashfs,sd-mod,usb-storage modloop=/boot/grsec.modloop.squashfs console=hvc0"

# Path to HDD and iso file
disk = [
        'format=raw, vdev=xvda, access=w, target=/path/to/disk.img',
        'format=raw, vdev=xvdc, access=r, devtype=cdrom, target=/path/to/the/iso'
       ]

# Network configuration
vif = ['bridge=br0']

# DomU settings
memory = 512
name = "alpine"
vcpus = 1
maxvcpus = 1

Install the guest

Now that we have all the necessary files, we can start the DomU to proceed with the install:

# xl create -f /path/to/conf -c

Login into the system with user "root" and no password, and proceed with the normal install:

# setup-alpine

After configuring the basic system, you will be asked where would you like to install Alpine, choose xvda and sys.

This will create three partitions on your disk, xvda1 for /boot, xvda2 for swap and xvda3 for /

Available disks are:
  xvda	(3.1 GB  )
Which disk(s) would you like to use? (or '?' for help or 'none') [none] xvda
The following disk is selected:
  xvda	(3.1 GB  )
How would you like to use it? ('sys', 'data' or '?' for help) [?] sys
WARNING: The following disk(s) will be erased:
  xvda	(3.1 GB  )
WARNING: Erase the above disk(s) and continue? [y/N]: y
Initializing partitions on /dev/xvda...
Creating file systems...
Installing system on /dev/xvda3:


Installation is complete. Please reboot.

# halt

Adjust the domU config file to boot from fresh install

In your Dom0, edit your DomU config file to boot from the fresh install


# Alpine Linux PV DomU

# Kernel paths for install
kernel = "/path/to/save/kernel/grsec"
ramdisk = "/path/to/save/kernel/grsec.gz"
extra="modules=sd-mod,usb-storage,ext4,squashfs console=hvc0 root=/dev/xvda3"


# Path to HDD and iso file
disk = [
        'format=raw, vdev=xvda, access=w, target=/path/to/disk.img'
       ]

# Network configuration
vif = ['bridge=br0']

# DomU settings
memory = 512
name = "alpine"
vcpus = 1
maxvcpus = 1

Adding a grub config file to boot with pvgrub

Now boot the VM once more to add a grub.conf file so that we may load the xen-aware kernel from within the VM.

This means that upgrading the kernel will not mean copying it to the dom0.

# xl create -f /path/to/conf -c

Log in as root and create the file /boot/grub.conf with the following content


#/boot/grub.conf

default 0
timeout 5
 
title alpine-xen-pv
	root (hd0,0)
	kernel /boot/grsec modules=sd-mod,usb-storage,ext4,squashfs console=hvc0 root=/dev/xvda3
	initrd /boot/grsec.gz 

Halt your VM one last time

# halt

Adjust the DomU config file one last time to use pvgrub

Your final xen DomU config file should look something like this.

# Alpine Linux PV DomU
disk = [
        'format=raw, vdev=xvda, access=w, target=/path/to/alpine.img'
        ]

kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
extra="(hd0,0)/boot/grub.conf"

vif = [ 'bridge=br0' ]
memory = 1024
name = "alpine"
vcpus = 1
maxvcpus = 1

When you next boot, you will be presented with the grub boot menu, and your VM will boot.