Xen users - Jul 2007 - Howto install domU CentOS 5 directly on partition

Hi.

I am new to CentOS (Debian user) and I am looking for way how to install 
CentOS 5 on domU in the way that I have it directly on dom0 LVM partition.
If I install it with virtual-manager then the installation program takes 
that partition as a disk and then creates new partitions on it. I don''t
want it that way because I cannot then mount it from dom0.

Is there some way how to install it directly on partition as for example 
in Debian with debootstrap?

Thank you

Jiri

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kanour-xen wrote:
> Hi.
>
> I am new to CentOS (Debian user) and I am looking for way how to 
> install CentOS 5 on domU in the way that I have it directly on dom0 
> LVM partition.
> If I install it with virtual-manager then the installation program 
> takes that partition as a disk and then creates new partitions on it. 
> I don''t want it that way because I cannot then mount it from dom0.
Yes, you can. I agree that virt-install and virt-manager make some 
really bad default assumptions, and prefer the latest versions. But 
there are two underlying issues:

1: You can access the internal partitions from Dom0. Avoid the use of 
LVM in the DomU (which is a pointless thing to do in the first place 
there!), and use "kpartx -a -v
/dev/Vol[whatver]/[Xen-image-partition]".
Then mount the partitions from /dev/mapper/[Xen-image-partiion]1, etc.

2: The virt-install and virt-manager have the use of pygrub hard-coded 
into them, but *hardcoded*. This has advantages, but means you need grub 
to manage kernels in your DomU. And grub cannot deal with hard drive 
partitions like /dev/xdva1 that does not have a drive named /dev/xdva to 
go with it. Sad, but true, and an issue with grub itself for Xen 
implementations.
> Is there some way how to install it directly on partition as for 
> example in Debian with debootstrap?
There are plenty of OS image building tools, such as "mock" and those 
images at www.jailtime.org. You can save a good OS image as a tarball 
and build from that, if you like, but you''ll have to work out the
pygrub
fun if you use that.

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kanour-xen wrote:
> Hi.
>
> I am new to CentOS (Debian user) and I am looking for way how to 
> install CentOS 5 on domU in the way that I have it directly on dom0 
> LVM partition.
> If I install it with virtual-manager then the installation program 
> takes that partition as a disk and then creates new partitions on it. 
> I don''t want it that way because I cannot then mount it from dom0.
>
> Is there some way how to install it directly on partition as for 
> example in Debian with debootstrap?
Only by manually building a tarball of a working OS image, and laying it 
onto your partitions directly. Take a look at www.jailtime.org for 
samples. Note that pygrub, and grub itself, *will not work* if you do 
this. Grub needs to see a disk, not just partitions, for various 
configuration reasons. This may be soluble in the long term, but I 
lacked time to play iwth it.

Why not use partitions on partitions, and use "kpartx" to make them 
accessible from the Dom0?

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I used virt-install, and selected custom partitioning during the install
process, removing the LVM stuff and reducing it to one partition.  Then
the install proceeded fine.  That created my "template" OS, with a
single partition and no swap (ignore the warning about missing swap
during install).  That is created on a logical volume accessible from
dom0, can be mounted with kpartx and mount.

Now I just create logical volumes for data and swap, and copy (using dd)
the template to the data, mkswap on swap.
Then, mount the data volume, make a few changes, and just start it up.
I can send more details if you like, but I''ve got to run now.
It took me a *looooong* time to figure out exactly how to do it, but now
I can set up a new domU in less than ten minutes, and it´s easy to
access the domU files from dom0.

Liam


kanour-xen wrote:
> Hi.
>
> I am new to CentOS (Debian user) and I am looking for way how to
> install CentOS 5 on domU in the way that I have it directly on dom0
> LVM partition.
> If I install it with virtual-manager then the installation program
> takes that partition as a disk and then creates new partitions on it.
> I don''t want it that way because I cannot then mount it from dom0.
>
> Is there some way how to install it directly on partition as for
> example in Debian with debootstrap?
>
> Thank you
>
> Jiri
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
>
-- 
Liam Kirsher
PGP: http://liam.numenet.com/pgp/


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Hi Liam,
I''d like to see the details - I''ll try on a f7 machine.  It
would be
great not to have to learn everything from scratch for once!
Thanks!
Paul Van Allsburg

Liam Kirsher wrote:
> I used virt-install, and selected custom partitioning during the install
> process, removing the LVM stuff and reducing it to one partition.  Then
> the install proceeded fine.  That created my "template" OS, with
a
> single partition and no swap (ignore the warning about missing swap
> during install).  That is created on a logical volume accessible from
> dom0, can be mounted with kpartx and mount.
> 
> Now I just create logical volumes for data and swap, and copy (using dd)
> the template to the data, mkswap on swap.
> Then, mount the data volume, make a few changes, and just start it up.
> I can send more details if you like, but I''ve got to run now.
> It took me a *looooong* time to figure out exactly how to do it, but now
> I can set up a new domU in less than ten minutes, and it´s easy to
> access the domU files from dom0.
> 
> Liam
> 
> 
> kanour-xen wrote:
>> Hi.
>>
>> I am new to CentOS (Debian user) and I am looking for way how to
>> install CentOS 5 on domU in the way that I have it directly on dom0
>> LVM partition.
>> If I install it with virtual-manager then the installation program
>> takes that partition as a disk and then creates new partitions on it.
>> I don''t want it that way because I cannot then mount it from
dom0.
>>
>> Is there some way how to install it directly on partition as for
>> example in Debian with debootstrap?
>>
>> Thank you
>>
>> Jiri
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>>
>>
> 

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Hi Guys.

I just would like to share how I completed installation of  domU CentOS
5 directly on partition. I used some of yours ideas which I did not
know (kpartx)

1/

I created new Logical Volume "X01"

2/

I installed domU normally through graphical virtual-manager on Logical
Volume "X01" (LVM). I used 1000MB Ram and I created only one partition
/ (root). No swap.

After installation I stoped this domU.

3/

I created new Logical Volume "Z01"

From Dom0:

  Copy all files From "X01" to "Z01" (I mounted that Logical
Volume
"X10" with kpartx and mount. I also mounted "Z01".)
  Copy kernel and initrd from "Z01" to Dom0 /boot. The one you want
to use for VM. I name it with extension -domU-Z01 to better recognize
which kerlnel is which. (Generally, You have to boot the DomU from the
same kernels as are in DomU!!! Otherwise you can get kernel panic.
Example of my /boot (notice ...-domU-Z01):

          (ls -al /boot)

drwxr-xr-x  4 root root    1024 Jul 31 07:07 .

drwxr-xr-x 24 root root    4096 Jul 31 05:26 ..

-rw-r--r--  1 root root   58604 Jul 10 21:26 config-2.6.18-8.1.8.el5xen

-rw-r--r--  1 root root   58600 Mar 16 11:02 config-2.6.18-8.el5xen

drwxr-xr-x  2 root root    1024 Jul 23 23:58 grub

-rw-------  1 root root 1669017 Jul 23 23:58
initrd-2.6.18-8.1.8.el5xen.img

-rw-------  1 root root 1437797 Jul 31 06:53
initrd-2.6.18-8.1.8.el5xen.img-domU-Z01

-rw-------  1 root root 1669035 Jul 22 01:55 initrd-2.6.18-8.el5xen.img

drwx------  2 root root   12288 Jul 22 01:52 lost+found

-rw-r--r--  1 root root   80032 Apr  2 00:49 message

-rw-r--r--  1 root root   85349 Jul 10 21:26
symvers-2.6.18-8.1.8.el5xen.gz

-rw-r--r--  1 root root   85349 Mar 16 11:02 symvers-2.6.18-8.el5xen.gz

-rw-r--r--  1 root root 1091680 Jul 10 21:26
System.map-2.6.18-8.1.8.el5xen

-rw-r--r--  1 root root 1091650 Mar 16 11:02 System.map-2.6.18-8.el5xen

-rw-r--r--  1 root root 1893500 Jul 10 21:26 vmlinuz-2.6.18-8.1.8.el5xen

-rw-r--r--  1 root root 1893500 Jul 10 21:26
vmlinuz-2.6.18-8.1.8.el5xen-domU-Z01

-rw-r--r--  1 root root 1893708 Mar 16 11:02 vmlinuz-2.6.18-8.el5xen

-rw-r--r--  1 root root  276912 Jul 10 20:33 xen.gz-2.6.18-8.1.8.el5

-rw-r--r--  1 root root  276329 Mar 16 10:45 xen.gz-2.6.18-8.el5

-rwxr-xr-x  1 root root  642368 Jul 10 21:31 xen-syms-2.6.18-8.1.8.el5

-rwxr-xr-x  1 root root  642368 Mar 16 11:08 xen-syms-2.6.18-8.el5

  Create config file for new domU with kernel and ramdisk. Example

kernel=''/boot/vmlinuz-2.6.18-8.1.8.el5xen-domU-Z01''

ramdisk=''/boot/initrd-2.6.18-8.1.8.el5xen.img-domU-Z01''

memory=''1000''

name=''Z01''

root=''/dev/sda1''

disk=[''phy:/dev/vm_vg/zimbra02_root,sda1,w'',

      ''phy:/dev/vm_vg/zimbra02_swap,sda2,w'']

vif = [ ''mac=00:16:3e:67:bc:33, bridge=xenbr0'', ]

vfb = ["type=vnc,vncunused=1"]

on_poweroff = ''destroy''

on_reboot   = ''restart''

on_crash    = ''restart''

  Edit /etc/fstab in Logical Volume "Z01" for / and swap. (notice
/dev/sda[12] which coresponds to config_file) Example:

/dev/sda1               /                       ext3   
defaults        1 1

devpts                  /dev/pts                devpts  gid=5,mode=620 
0 0

tmpfs                   /dev/shm                tmpfs   defaults       
0 0

proc                    /proc                   proc    defaults       
0 0

sysfs                   /sys                    sysfs   defaults       
0 0

/dev/sda2               swap                    swap    defaults       
0 0

  my network card in domU was already configured for DHCP. Make
sure you have the config OK.
  umount all Logical Volumes
  xm create -c config_file

Note: If you update kernels in domU make sure you update them in dom0
otherwise you can get Kernel Panic.

Cheers kanour-xen

Liam Kirsher wrote:

I used virt-install, and selected custom partitioning during the install
process, removing the LVM stuff and reducing it to one partition.  Then
the install proceeded fine.  That created my "template" OS, with a
single partition and no swap (ignore the warning about missing swap
during install).  That is created on a logical volume accessible from
dom0, can be mounted with kpartx and mount.

Now I just create logical volumes for data and swap, and copy (using dd)
the template to the data, mkswap on swap.
Then, mount the data volume, make a few changes, and just start it up.
I can send more details if you like, but I''ve got to run now.
It took me a *looooong* time to figure out exactly how to do it, but now
I can set up a new domU in less than ten minutes, and it´s easy to
access the domU files from dom0.

Liam

kanour-xen wrote:

Hi.

I am new to CentOS (Debian user) and I am looking for way how to
install CentOS 5 on domU in the way that I have it directly on dom0
LVM partition.
If I install it with virtual-manager then the installation program
takes that partition as a disk and then creates new partitions on it.
I don''t want it that way because I cannot then mount it from dom0.

Is there some way how to install it directly on partition as for
example in Debian with debootstrap?

Thank you

Jiri

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users


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Paul,

I think someone else already furnished basically the same info, but here
is more on what I did.  I just wanted identical CentOS5 virtual
machines.  Below, I give them the name domN, where N is some integer.

First, I created a template installation using virt-install with these
variables
virt-install --paravirt --nographics --name=domTemplate \
        --location=nfs:192.168.1.102:/linux/CentOS-5.0-x86_64 \
        --ram=512

Others have pointed out that the virt-* programs need at least 500M of
RAM to function, otherwise they hang.
I didn''t see how to use virt-manager to re-partition -- it kept giving
me the LVM volumes, but maybe it''s possible.
Anyway, during installation with virt-install I removed all the volumes
and partitions and created a single new one that used the entire space
(which consisted of a previously created logical volume of 2G, named
domTemplate_data).
Ignore the warning about not having swap. The template doesn''t need
swap, that gets created for each domU.
I unchecked all the packages to be installed, because I wanted a small,
generic installation to start with.  It came out to be around 1.2G, if I
recall. You could make it slimmer, but that was good enough for my purposes.

After the domTemplate is created, you might want to check to make sure
it works before going any farther:
xm create -c domTemplate

I borrowed from the following how-to:
http://www.redhat.com/archives/fedora-xen/2006-November/msg00257.html

- Create lvm partitions:
lvcreate -L 1G -n domN_swap VolGroup01
lvcreate -L 3G -n domN_data VolGroup01

- Map the domTemplate_data partition:
kpartx -av /dev/VolGroup01/domTemplate_data

- Use dd to copy to the new partition:
dd if=/dev/mapper/VolGroup01-domTemplate_data of=/dev/VolGroup01/domN_data

- Create swap space:
mkswap /dev/VolGroup01/domN_swap

- Unmap the domTemplate_data partition:
kpartx -dv /dev/VolGroup01/domTemplate_data

- Mount the new data partition:
mount /dev/VolGroup01/domN_data /mnt/domN

- In new host, edit the following files and change ''template''
to new name.
- I had named the host "template" to remind me which one I was working
with.
vi /mnt/domN/etc/hosts
vi /mnt/domN/etc/sysconfig/network

- Also on new host, set the correct IP address and MAC address:
vi /mnt/domN/etc/sysconfig/network-scripts/ifcfg-eth0

- Unmount the new data partition:
umount /mnt/domN

- Copy the ''image'' xen configuration file and edit it:
cp /etc/xen/domTemplate /etc/xen/domN
vi /etc/xen/domN
        set MAC address to unique!
        set memory
(I forgot to set the MAC address once, and ended up with perplexing
networking problems.  It should be unique, and should match the MAC
value set in ifcfg-eth0.  I removed the unique id, I think that should
be okay, not sure why I would need it.
You may also want to put a link in the /etc/xen/auto directory, so the
domain is created when the system boots up.)

RESIZE FILE SYSTEM if domN logical volume is larger than the template! 
Make sure it''s not running, first.
e2fsck -f /dev/VolGroup01/domN_data
resize2fs  /dev/VolGroup01/domN_data

Start it up:
xm create -c domN

Login and run ''yum update'' and install any additional
packages.

There, I hope that helps!

Best,
Liam

Paul Van Allsburg wrote:
> Hi Liam,
> I''d like to see the details - I''ll try on a f7 machine. 
It would be
> great not to have to learn everything from scratch for once!
> Thanks!
> Paul Van Allsburg
>
> Liam Kirsher wrote:
>> I used virt-install, and selected custom partitioning during the
install
>> process, removing the LVM stuff and reducing it to one partition.  Then
>> the install proceeded fine.  That created my "template" OS,
with a
>> single partition and no swap (ignore the warning about missing swap
>> during install).  That is created on a logical volume accessible from
>> dom0, can be mounted with kpartx and mount.
>>
>> Now I just create logical volumes for data and swap, and copy (using
dd)
>> the template to the data, mkswap on swap.
>> Then, mount the data volume, make a few changes, and just start it up.
>> I can send more details if you like, but I''ve got to run now.
>> It took me a *looooong* time to figure out exactly how to do it, but
now
>> I can set up a new domU in less than ten minutes, and it´s easy to
>> access the domU files from dom0.
>>
>> Liam
>>
>>
>> kanour-xen wrote:
>>> Hi.
>>>
>>> I am new to CentOS (Debian user) and I am looking for way how to
>>> install CentOS 5 on domU in the way that I have it directly on dom0
>>> LVM partition.
>>> If I install it with virtual-manager then the installation program
>>> takes that partition as a disk and then creates new partitions on
it.
>>> I don''t want it that way because I cannot then mount it
from dom0.
>>>
>>> Is there some way how to install it directly on partition as for
>>> example in Debian with debootstrap?
>>>
>>> Thank you
>>>
>>> Jiri
>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@lists.xensource.com
>>> http://lists.xensource.com/xen-users
>>>
>>>
>>
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
>
-- 
Liam Kirsher
PGP: http://liam.numenet.com/pgp/


_______________________________________________
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Liam Kirsher wrote:
> Paul,
>
> I think someone else already furnished basically the same info, but here
> is more on what I did.  I just wanted identical CentOS5 virtual
> machines.  Below, I give them the name domN, where N is some integer.
>
> First, I created a template installation using virt-install with these
> variables
> virt-install --paravirt --nographics --name=domTemplate \
>         --location=nfs:192.168.1.102:/linux/CentOS-5.0-x86_64 \
>         --ram=512
>
> Others have pointed out that the virt-* programs need at least 500M of
> RAM to function, otherwise they hang.
> I didn''t see how to use virt-manager to re-partition -- it kept
giving
> me the LVM volumes, but maybe it''s possible.
>   
You do it in your CentOS kickstart, or by hand-configuring disks in your 
CentOS installation as ou did.

> Anyway, during installation with virt-install I removed all the volumes
> and partitions and created a single new one that used the entire space
> (which consisted of a previously created logical volume of 2G, named
> domTemplate_data).
> Ignore the warning about not having swap. The template doesn''t
need
> swap, that gets created for each domU.
>   
Swap is not evil in such a simple setup. You can add it later by adding 
another DomU "disk" and partition.

> I unchecked all the packages to be installed, because I wanted a small,
> generic installation to start with.  It came out to be around 1.2G, if I
> recall. You could make it slimmer, but that was good enough for my
purposes.
>   
Yeah, this is RedHat''s fault. I''ve growsed at them about it.
I''m sorry,
but a "base" installation should not include bluetooth and ISDN
widgets.
> After the domTemplate is created, you might want to check to make sure
> it works before going any farther:
> xm create -c domTemplate
>
> I borrowed from the following how-to:
> http://www.redhat.com/archives/fedora-xen/2006-November/msg00257.html
>
> - Create lvm partitions:
> lvcreate -L 1G -n domN_swap VolGroup01
> lvcreate -L 3G -n domN_data VolGroup01
>
> - Map the domTemplate_data partition:
> kpartx -av /dev/VolGroup01/domTemplate_data
>
> - Use dd to copy to the new partition:
> dd if=/dev/mapper/VolGroup01-domTemplate_data of=/dev/VolGroup01/domN_data
>
> - Create swap space:
> mkswap /dev/VolGroup01/domN_swap
>
> - Unmap the domTemplate_data partition:
> kpartx -dv /dev/VolGroup01/domTemplate_data
>
> - Mount the new data partition:
> mount /dev/VolGroup01/domN_data /mnt/domN
>
> - In new host, edit the following files and change
''template'' to new name.
> - I had named the host "template" to remind me which one I was
working with.
> vi /mnt/domN/etc/hosts
> vi /mnt/domN/etc/sysconfig/network
>
> - Also on new host, set the correct IP address and MAC address:
> vi /mnt/domN/etc/sysconfig/network-scripts/ifcfg-eth0
>
> - Unmount the new data partition:
> umount /mnt/domN
>
> - Copy the ''image'' xen configuration file and edit it:
> cp /etc/xen/domTemplate /etc/xen/domN
> vi /etc/xen/domN
>         set MAC address to unique!
>         set memory
> (I forgot to set the MAC address once, and ended up with perplexing
> networking problems.  It should be unique, and should match the MAC
> value set in ifcfg-eth0.  I removed the unique id, I think that should
> be okay, not sure why I would need it.
> You may also want to put a link in the /etc/xen/auto directory, so the
> domain is created when the system boots up.)
>
> RESIZE FILE SYSTEM if domN logical volume is larger than the template! 
> Make sure it''s not running, first.
> e2fsck -f /dev/VolGroup01/domN_data
> resize2fs  /dev/VolGroup01/domN_data
>   
No need for this. You can store a tarball of the file system, not the 
file system itself, which is inevitably more space efficient, and 
restore the tarball to a new filesystem in similar fashion. I''ve done 
this before, to about 13,000 servers in one month, so I''m sure the 
technique works well. It''s also one heck of a lot faster than using 
Anaconda and most other OS installers.

Getting "grub" loaded for use by pygrub in my approach of setup is....
a
bit of an art form to discuss another time.

Your write-up is overall quite good, and appropriate for a FAQ.

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Hi all,

I have a more simple way for this problem.

Use virt-install to install the domU.
Create only one partition that is root partition on the exported disk.

for example : /tmp/disk is exported for the domU then it will be exported as
hda. then create a single partition ( Dont use LVM ) and dont install
bootloader as we dont need for pv domain.

Now after installation we can mount the partition 1 in dom0 using lomount.
as below and can see the contents also. then u can can make the tarball and
can copy wherever u want.

lomount  -diskimage /tmp/disk -partition 1 /mnt

Hope it would be worthful.
Thanks,
Trilok

On 7/30/07, kanour-xen <xen@kanour.com> wrote:
>
>  Hi Guys.
>
> I just would like to share how I completed installation of  domU CentOS 5
> directly on partition. I used some of yours ideas which I did not know
> (kpartx)
>
> *1/*
> I created new Logical Volume "X01"
>
> *2/*
> I installed domU normally through graphical virtual-manager on Logical
> Volume "X01" (LVM). I used 1000MB Ram and I created only one
partition /
> (root). No swap.
> After installation I stoped this domU.
>
> *3/*
> I created new Logical Volume "Z01"
>
> *From Dom0:*
>
>    - Copy all files From "X01" to "Z01" (I mounted that
Logical Volume
>    "X10" with kpartx and mount. I also mounted "Z01".)
>    - Copy kernel and initrd from "Z01" to Dom0 /boot. The one you
want
>    to use for VM. I name it with extension -domU-Z01 to better recognize
which
>    kerlnel is which. (Generally, You have to boot the DomU from the same
>    kernels as are in DomU!!! Otherwise you can get kernel panic. Example of
my
>    /boot (notice ...-domU-Z01):
>
>           (ls -al /boot)
>
> drwxr-xr-x  4 root root    1024 Jul 31 07:07 .
> drwxr-xr-x 24 root root    4096 Jul 31 05:26 ..
> -rw-r--r--  1 root root   58604 Jul 10 21:26 config-2.6.18-8.1.8.el5xen
> -rw-r--r--  1 root root   58600 Mar 16 11:02 config-2.6.18-8.el5xen
> drwxr-xr-x  2 root root    1024 Jul 23 23:58 grub
> -rw-------  1 root root 1669017 Jul 23 23:58
> initrd-2.6.18-8.1.8.el5xen.img
> -rw-------  1 root root 1437797 Jul 31 06:53
> initrd-2.6.18-8.1.8.el5xen.img-domU-Z01
> -rw-------  1 root root 1669035 Jul 22 01:55 initrd-2.6.18-8.el5xen.img
> drwx------  2 root root   12288 Jul 22 01:52 lost+found
> -rw-r--r--  1 root root   80032 Apr  2 00:49 message
> -rw-r--r--  1 root root   85349 Jul 10 21:26
> symvers-2.6.18-8.1.8.el5xen.gz
> -rw-r--r--  1 root root   85349 Mar 16 11:02 symvers-2.6.18-8.el5xen.gz
> -rw-r--r--  1 root root 1091680 Jul 10 21:26
> System.map-2.6.18-8.1.8.el5xen
> -rw-r--r--  1 root root 1091650 Mar 16 11:02 System.map-2.6.18-8.el5xen
> -rw-r--r--  1 root root 1893500 Jul 10 21:26 vmlinuz-2.6.18-8.1.8.el5xen
> -rw-r--r--  1 root root 1893500 Jul 10 21:26
> vmlinuz-2.6.18-8.1.8.el5xen-domU-Z01
> -rw-r--r--  1 root root 1893708 Mar 16 11:02 vmlinuz-2.6.18-8.el5xen
> -rw-r--r--  1 root root  276912 Jul 10 20:33 xen.gz-2.6.18-8.1.8.el5
> -rw-r--r--  1 root root  276329 Mar 16 10:45 xen.gz-2.6.18-8.el5
> -rwxr-xr-x  1 root root  642368 Jul 10 21:31 xen-syms-2.6.18-8.1.8.el5
> -rwxr-xr-x  1 root root  642368 Mar 16 11:08 xen-syms-2.6.18-8.el5
>
>
>
>    - Create config file for new domU with kernel and ramdisk. Example
>
> kernel=''/boot/vmlinuz-2.6.18-8.1.8.el5xen-domU-Z01''
> ramdisk=''/boot/initrd-2.6.18-8.1.8.el5xen.img-domU-Z01''
> memory=''1000''
> name=''Z01''
> root=''/dev/sda1''
> disk=[''phy:/dev/vm_vg/zimbra02_root,sda1,w'',
>       ''phy:/dev/vm_vg/zimbra02_swap,sda2,w'']
> vif = [ ''mac=00:16:3e:67:bc:33, bridge=xenbr0'', ]
> vfb = ["type=vnc,vncunused=1"]
> on_poweroff = ''destroy''
> on_reboot   = ''restart''
> on_crash    = ''restart''
>
>
>    - Edit /etc/fstab in Logical Volume "Z01" for / and swap.
(notice
>    /dev/sda[12] which coresponds to config_file) Example:
>
> /dev/sda1               /                       ext3    defaults        1
> 1
> devpts                  /dev/pts                devpts  gid=5,mode=620  0
> 0
> tmpfs                   /dev/shm                tmpfs   defaults        0
> 0
> proc                    /proc                   proc    defaults        0
> 0
> sysfs                   /sys                    sysfs   defaults        0
> 0
> /dev/sda2               swap                    swap    defaults        0
> 0
>
>
>    - my network card in domU was already configured for DHCP. Make sure
>    you have the config OK.
>    - umount all Logical Volumes
>    - xm create -c config_file
>
> Note: If you update kernels in domU make sure you update them in dom0
> otherwise you can get Kernel Panic.
>
> Cheers kanour-xen
> ------------------------------
>
>
> Liam Kirsher wrote:
>
> I used virt-install, and selected custom partitioning during the install
> process, removing the LVM stuff and reducing it to one partition.  Then
> the install proceeded fine.  That created my "template" OS, with
a
> single partition and no swap (ignore the warning about missing swap
> during install).  That is created on a logical volume accessible from
> dom0, can be mounted with kpartx and mount.
>
> Now I just create logical volumes for data and swap, and copy (using dd)
> the template to the data, mkswap on swap.
> Then, mount the data volume, make a few changes, and just start it up.
> I can send more details if you like, but I''ve got to run now.
> It took me a *looooong* time to figure out exactly how to do it, but now
> I can set up a new domU in less than ten minutes, and it´s easy to
> access the domU files from dom0.
>
> Liam
>
>
> kanour-xen wrote:
>
>  Hi.
>
> I am new to CentOS (Debian user) and I am looking for way how to
> install CentOS 5 on domU in the way that I have it directly on dom0
> LVM partition.
> If I install it with virtual-manager then the installation program
> takes that partition as a disk and then creates new partitions on it.
> I don''t want it that way because I cannot then mount it from dom0.
>
> Is there some way how to install it directly on partition as for
> example in Debian with debootstrap?
>
> Thank you
>
> Jiri
>
> _______________________________________________
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> Xen-users@lists.xensource.com
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>
>
>
>
> _______________________________________________
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>

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This reminds me. I promised to post the "build a CentOS or RHEL DVD"
widget,
useful for doing HVM or VT installations like this.



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