Re: [Xen-users] centos4.5(domU) on etch(dom0)

[Igor Chubin <igor@xxxxxxx>]

On Fr, Nov 30, 2007 at 06:46:52 +0100, Chris Fanning wrote:
> Hi,
> 
> I'd like to know how to install centos (4.5 in my case) to run as a
> domU on a dom0 running etch.
> 
> Any tips please?

Make sure that you have enough free space
on the file system where you are going to make image for centos
(or create PV if you are going to use LVM).

# df -h
# dd if=/dev/zero of=centos.img count=1 bs=1k seek=$[2*1024*1024]
# mkfs.ext3 centos.img
# mount -o loop centos.img /mnt


Now you have 2G-size image with ext3 filesystem mounted to /mnt directory.

After that:

# apt-get install yum
# yum -c /tmp/yum-xen.conf --installroot=/mnt -y groupinstall Base


where you-xen.conf file should look like:

===================================================
[main]
cachedir=/var/cache/yum
debuglevel=2
logfile=/var/log/yum.log
exclude=*-debuginfo
gpgcheck=0
obsoletes=1
reposdir=/dev/null

[base]
name=CentOS-$releasever - Plus
baseurl=http://mirror.centos.org/centos/$releasever/centosplus/$basearch/
enabled=1
===================================================



if you have the error during installation
------------------------------------------------
Failed to add groups file for repository: base
Error: No Groups on which to run command
------------------------------------------------

then modify yum code like shown below:

------------------------------------------------
# cp /usr/share/python-support/yum/yum/comps.py{,.ORIG}
# vi /usr/share/python-support/yum/yum/comps.py        
# diff /usr/share/python-support/yum/yum/comps.py{.ORIG,}
124c124
<                 if type not in ('mandatory', 'default',
'optional'):
---
>                 if type not in ('mandatory', 'default',
>                 'optional', 'conditional'):
143c143
<                 if type not in ('mandatory', 'default',
'optional'):
---
>                 if type not in ('mandatory', 'default',
>                 'optional', 'conditional'):
------------------------------------------------



Create several directories and device files:

%# /mnt/{dev,proc,etc}
%# for i in console null zero ; do /sbin/MAKEDEV -d /mnt/dev -x $i ;
%done

Disable TLS.

%# mv /mnt/lib/tls /mnt/lib/tls-disabled

Create /etc/fstab
(of course you must specify correct device files)

%# cat <<EOL > /mnt/etc/fstab
/dev/sda1               /                       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/sda2               /mnt                    ext3    defaults 1 2
#/dev/sda3               swap                    swap    defaults 0 0
EOL



Setup network interfaces
(I suppose that you use one interface which should acquire
its IP-address via DHCP).


%# cat <<EOL > /mnt/etc/sysconfig/network
NETWORKING=yes
HOSTNAME=localhost.localdomain
EOL

cat <<EOL > /mnt/etc/sysconfig/network-scripts/ifcfg-eth0
ONBOOT=yes
DEVICE=eth0
BOOTPROTO=dhcp
EOL




Copy kernel modules to the domU filesystem
(alternatively you can install Xenified Linux Kernel
inside domU using yum).

%# cp -R /lib/modules/2.6.*xen* /mnt/lib/modules/


Set root password for domU:


%$ sudo chroot /mnt
bash-3.1# pwconv
bash-3.1# passwd
Changing password for user root.
New UNIX password: 
Retype new UNIX password: 
passwd: all authentication tokens updated successfully.
bash-3.1# exit



That's all.
No you may umount your image and make 

%# xm create -c centos 

centos here is the name of the Xen domain config file
which will run the image that you have prepared.




> 
> Thanks.
> Chris.
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users

-- 
WBR, i.m.chubin


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