[Xen-devel] Fedora Core 3 & Xen How-To for Beginners

[Jerone Young <jyoung5@xxxxxxxxxx>]

For those having troubles install Xen here is a nice simple How-to. This
could possibly be added to the Xen Users guide. Attached is an html
version. Below is the text version:


                      Setting up Fedora Core 3 w/ Xen

1. Getting Started

   You should start with a machine you're willing to dedicate. If you're
not
   dedicating the machine to Xen then you'll have to make adjustments as
you
   go.
   You also need the Fedora Core 3 CDs or DVD.

2. Overview

   This is intended as easy guide for getting Xen & Fedora 3 working
together
   for those having problems getting them working together.

3. Packages

   You need to start with a copy of xen-2.0.3, Twisted-1.3.0,
linux-2.6.10,
   bridge-utils, and sysfs-utils.

   Web Locations of packages:

   * xen-2.0.3->
   http://www.cl.cam.ac.uk/Research/SRG/netos/xen/downloads/xen-2.0.3-
src.tgz

   * Twisted-1.3.0 ->
http://twistedmatrix.com/downloads/Twisted-1.3.0.tar.gz

   * linux-2.6.10 ->
   http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.10.tar.bz2

   * bridge-utils ->
   http://mirrors.kernel.org/fedora/core/3/i386/os/Fedora/RPMS/bridge-
utils-1.0
   .4-4.i386.rpm

   * sysfs-utils ->

http://mirrors.kernel.org/fedora/core/3/i386/os/Fedora/RPMS/sysfsutils-1.2.0
   -1.i386.rpm

4. Steps to Create Domain 0

    1. Install Fedora Core 3 on the system:

    a. On "Installation Type" screen choose "Server"
    b. On"Disk Setup" screen allocate about 10GB for your root partition
("/").
       Optionally allocate about 1GB for swap partition. Remember you
will need
       to leave space for partitions for other domains.
    c. On "Firewall Configuration" screen DISABLE the firewall and
DISABLE
       SELinux.
    d. At  "Package Group Selection" screen place a check by
"Development
       Tools". Also check any additional package you want to add.
    e. Go through installation & reboot.

    2. Boot into your new Fedora Core 3 system.
    3. Install bridge-utils and sysfs-utils rpms.
    4. Unpack Twisted-1.3.0.tar.gz
    5. cd Twisted-1.3.0
    6. python setup.py install
    7. ln -s /usr/lib/libidn.so.11 /usr/lib/libidn.so (don't worry if
already
       exists)
    8. Unpack xen-2.0.3-src.tgz
    9. cp linux-2.6.10.tar.bz2 xen-2.0
   10. cd xen-2.0
   11. make
   12. ./install.sh
   13. cp dist/install/etc/init.d/xen* /etc/init.d
   14. chkconfig xend on
   15. chkconfig xendomains on
   16. touch /lib/modules/2.6.10-xen0/modules.dep (This step is needed
to
       create initrd image)
   17. mkinitrd /boot/initrd-2.6.10-xen0.img 2.6.10-xen0
   18. Add this to your grub configuration file (/boot/grub/grub.conf) :
       title Xen 2.0.3 (stable)
       kernel /boot/xen.gz dom0_mem=131072 console=vga
       module /boot/vmlinuz-2.6.10-xen0 root=/dev/hda1 ro console=tty0
       module /boot/initrd-2.6.10-xen0.img
   19. For the grub entry above make sure that "root=" is set to the
root
       partition ("/") that you setup.
   20. Also set "dom0_mem" to the amount of physical memory you want for
   21. Use fdisk to create new partitions for other virtual domains that
you
       are going to want to create. You can also set up your partitions
under
       LVM. See instructions from the Xen User Manual for more
information.

http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html
   22. Reboot and choose "Xen 2.0.3 (stable)" from Grub menu.

5. Create Fedora 3 Domain > 0 (Xen Virtual Domains)

    1. Create 2 new partitions for virtual machine. One will be for the
root
       partition ("/") ( this needs to be the about same size as your
current
       Fedora partition 10GB) , the other will be a swap partition for
the
       virtual machine (this partition is optional).
    2. Format   partition  for  root  partition  ("/")  using
"mkfs.ext3
       /dev/<location of root partition>". If making swap then use
"mkswap
       /dev/<location of swap partition>" to format swap.
    3. Mount your newly created for the root partition ("/") to /mnt
       mount /dev/<location of root partition> /mnt
    4. Your then going to copy your current Fedora installation to the
root
       partition ("/") of the new Xen virtual domain:
       cp -ax /{root,dev,var,etc,usr,bin,sbin,lib} /mnt
       mkdir /mnt/{proc,sys,home,tmp}
    5. Move tls libraries not supported by Xen:
       mv /mnt/lib/tls /mnt/lib/tls.disabled
    6. touch /lib/modules/2.6.10-xenU/modules.dep
    7. Create initrd for xenU kernel:
       mkinitrd /boot/initrd-2.6.10-xenU.img 2.6.10-xenU
    8. Create a new Xen virutal domain configuration file. Make a copy
of file
       /etc/xen/xmexample2 and place it in /etc/xen/. In that copy
important to
       make sure to have the following lines set:
       kernel = "/boot/vmlinuz-2.6.10-xenU"
       ramdisk="/boot/initrd-2.6.10-xenU.img"
       root="/dev/<location of root partition> ro"

    9. Comment out "extra=" line in the file.
   10. To point to your configuration file to the correct partitions
change the
       "disk=" line.
       disk  =  [  'phy:<location  of  root>,hda1,w',  'phy:<location
of
       swap>,hda2,w' ]
       This is an list of disk that you want the virtual domain to see
and what
       you want to the virtual domain to see them as. So
       'phy:hda5,hda1,w', reads that I want physical partition hda5 to
be seen
       by  the  virtual  domain  as hda1 and the virtual domain will
have
       read-write access to it.
   11. Edit /mnt/etc/fstab to point to proper partitions as specified in
your
       Xen virtual domain configuration. It should look something like:
       /dev/hda1 / ext3 defaults 1 1
       none /dev/pts devpts gid=5,mode=620 0 0
       none /dev/shm tmpfs defaults 0 0
       none /proc proc defaults 0 0
       none /sys sysfs defaults 0 0
       /dev/hda2 swap swap defaults 0 0
   12. Erase all entries in /mnt/etc/modprobe.conf
       echo > /mnt/etc/modprobe.conf
   13. umount /mnt
   14. Load new virtual machine:
       xm create -c <xen configuration> vmid=<some number>
   15. You should now be in your virtual machine :-)
   16. Kudzu will prompt you to remove a bunch hardware, remove the
hardware.
   17. To setup network
       echo "alias eth0 xen_net" > /etc/modprobe.conf
   18. Edit /etc/sysconfig/network-scripts/ifcfg-eth0 and add the
following
       text:
       DEVICE=eth0
       BOOTPROTO=dhcp
       ONBOOT=on
   19. Edit /etc/sysconfig/network to have:
       NETWORKING=yes
       HOSTNAME=<you choose the name>
   20. ifup eth0
   21. Networking will start automatically on boot from now on.
   22. It's a little messy, but once you get things configured nicely
you can
       create an image and copy it for other Xen virtual domains.
   23. For more information see Xen Users guide:

http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html

   Authors:
   Anthony Liguori <aliguori@xxxxxxxxxx>
   Jerone Young <jyoung5@xxxxxxxxxx>

-- 
Jerone Young
Open Virtualization
IBM Linux Technology Center
jyoung5@xxxxxxxxxx
512-838-1157 (T/L: 678-1157)

Setting up Fedora Core 3 w/ Xen

1. Getting Started

You should start with a machine you're willing to dedicate. If you're not dedicating the machine to Xen then you'll have to make adjustments as you go.

You also need the Fedora Core 3 CDs or DVD.

2. Overview

This is intended as easy guide for getting Xen & Fedora 3 working together for those having problems getting them working together.

3. Packages

You need to start with a copy of xen-2.0.3, Twisted-1.3.0, linux-2.6.10, bridge-utils, and sysfs-utils.

Web Locations of packages:

* xen-2.0.3-> http://www.cl.cam.ac.uk/Research/SRG/netos/xen/downloads/xen-2.0.3-src.tgz

* Twisted-1.3.0 -> http://twistedmatrix.com/downloads/Twisted-1.3.0.tar.gz

* linux-2.6.10 -> http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.10.tar.bz2

* bridge-utils -> http://mirrors.kernel.org/fedora/core/3/i386/os/Fedora/RPMS/bridge-utils-1.0.4-4.i386.rpm

* sysfs-utils -> http://mirrors.kernel.org/fedora/core/3/i386/os/Fedora/RPMS/sysfsutils-1.2.0-1.i386.rpm

4. Steps to Create Domain 0

1. Install Fedora Core 3 on the system:

1. On "Installation Type" screen choose "Server"

2. On"Disk Setup" screen allocate about 10GB for your root partition ("/"). Optionally allocate about 1GB for swap partition. Remember you will need to leave space for partitions for other domains.

3. On "Firewall Configuration" screen DISABLE the firewall and DISABLE SELinux.

4. At "Package Group Selection" screen place a check by "Development Tools". Also check any additional package you want to add.

5. Go through installation & reboot.

2. Boot into your new Fedora Core 3 system.

3. Install bridge-utils and sysfs-utils rpms.

4. Unpack Twisted-1.3.0.tar.gz

5. cd Twisted-1.3.0

6. python setup.py install

7. ln -s /usr/lib/libidn.so.11 /usr/lib/libidn.so (don't worry if already exists)

8. Unpack xen-2.0.3-src.tgz

9. cp linux-2.6.10.tar.bz2 xen-2.0

10. cd xen-2.0

11. make

12. ./install.sh

13. cp dist/install/etc/init.d/xen* /etc/init.d

14. chkconfig xend on

15. chkconfig xendomains on

16. touch /lib/modules/2.6.10-xen0/modules.dep (This step is needed to create initrd image)

17. mkinitrd /boot/initrd-2.6.10-xen0.img 2.6.10-xen0

18. Add this to your grub configuration file (/boot/grub/grub.conf) :
    title Xen 2.0.3 (stable)
    kernel /boot/xen.gz dom0_mem=131072 console=vga
    module /boot/vmlinuz-2.6.10-xen0 root=/dev/hda1 ro console=tty0
    module /boot/initrd-2.6.10-xen0.img

19. For the grub entry above make sure that "root=" is set to the root partition ("/") that you setup.

20. Also set "dom0_mem" to the amount of physical memory you want for

21. Use fdisk to create new partitions for other virtual domains that you are going to want to create. You can also set up your partitions under LVM. See instructions from the Xen User Manual for more information.

    http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html

22. Reboot and choose "Xen 2.0.3 (stable)" from Grub menu.

5. Create Fedora 3 Domain > 0 (Xen Virtual Domains)

1. Create 2 new partitions for virtual machine. One will be for the root partition ("/") ( this needs to be the about same size as your current Fedora partition 10GB) , the other will be a swap partition for the virtual machine (this partition is optional).

2. Format partition for root partition ("/") using "mkfs.ext3 /dev/<location of root partition>". If making swap then use "mkswap /dev/<location of swap partition>" to format swap.

3. Mount your newly created for the root partition ("/") to /mnt

   mount /dev/<location of root partition> /mnt

4. Your then going to copy your current Fedora installation to the root partition ("/") of the new Xen virtual domain:
   cp -ax /{root,dev,var,etc,usr,bin,sbin,lib} /mnt
   mkdir /mnt/{proc,sys,home,tmp}

5. Move tls libraries not supported by Xen:

   mv /mnt/lib/tls /mnt/lib/tls.disabled

6. touch /lib/modules/2.6.10-xenU/modules.dep

7. Create initrd for xenU kernel:
   mkinitrd /boot/initrd-2.6.10-xenU.img 2.6.10-xenU

8. Create a new Xen virutal domain configuration file. Make a copy of file /etc/xen/xmexample2 and place it in /etc/xen/. In that copy important to make sure to have the following lines set:

   kernel = "/boot/vmlinuz-2.6.10-xenU"
   ramdisk="/boot/initrd-2.6.10-xenU.img"

   root="/dev/<location of root partition> ro"

9. Comment out "extra=" line in the file.

10. To point to your configuration file to the correct partitions change the "disk=" line.

    disk = [ 'phy:<location of root>,hda1,w', 'phy:<location of swap>,hda2,w' ]

    This is an list of disk that you want the virtual domain to see and what you want to the virtual domain to see them as. So

    'phy:hda5,hda1,w', reads that I want physical partition hda5 to be seen by the virtual domain as hda1 and the virtual domain will have read-write access to it.

11. Edit /mnt/etc/fstab to point to proper partitions as specified in your Xen virtual domain configuration. It should look something like:

    /dev/hda1 / ext3 defaults 1 1

    none /dev/pts devpts gid=5,mode=620 0 0

    none /dev/shm tmpfs defaults 0 0

    none /proc proc defaults 0 0

    none /sys sysfs defaults 0 0

    /dev/hda2 swap swap defaults 0 0

12. Erase all entries in /mnt/etc/modprobe.conf

echo > /mnt/etc/modprobe.conf

13. umount /mnt

14. Load new virtual machine:
    xm create -c <xen configuration> vmid=<some number>

15. You should now be in your virtual machine :-)

16. Kudzu will prompt you to remove a bunch hardware, remove the hardware.

17. To setup network

    echo "alias eth0 xen_net" > /etc/modprobe.conf

18. Edit /etc/sysconfig/network-scripts/ifcfg-eth0 and add the following text:

    DEVICE=eth0

    BOOTPROTO=dhcp

    >

19. Edit /etc/sysconfig/network to have:

    NETWORKING=yes

    HOSTNAME=<you choose the name>

20. ifup eth0

21. Networking will start automatically on boot from now on.

22. It's a little messy, but once you get things configured nicely you can create an image and copy it for other Xen virtual domains.

23. For more information see Xen Users guide:

    http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html

Authors:
Anthony Liguori <aliguori@xxxxxxxxxx>
Jerone Young <jyoung5@xxxxxxxxxx>