Re: [Xen-users] Create a domU using rpmstrap CentOS

[carlopmart <carlopmart@xxxxxxxxx>]

Michael Lang wrote:
> On Sat, 2006-10-21 at 03:34 +0100, Joao Correia wrote:
> > Hello,
> >
> > I have CentOS release 4.4 (Final) dom0 and I want to create a CentOS
> > domU using rpmstrap.
> > I found several tutorials but I couldn't get a rpmstrap script to work
> > with the current CentOS repositories. It misses packages and
> > dependencies and it doesnt install properly. 
> >
> > Any tips ? anyone has a rpmstrap script working for CentOS ?
> >
> > I followed this tutorial:
> > http://mark.foster.cc/wiki/index.php/Centos-4_on_Xen 
> maybe this little howto using yum can help you.
>
> I'm using LVM, if you prefere using loopbacks mark's tutorial explains
> creation of loopback disks.
>
> # start creating the disk
> # where the Grp_Xen is expected to be the VolumeGroupName
>
> $ lvcreate -L 1G -n XEN01 Grp_Xen 
> $ mkfs.ext3 /dev/mapper/Grp_Xen-XEN01
> # now we need the packages 
>
> $ mount /dev/mapper/Grp_Xen-XEN01 /mnt
> $ mkdir -p /mnt/proc /mnt/var/lib/rpm /mnt/dev /var/cache/
> $ for i in console null zero random ; do MAKEDEV -d /mnt/dev -x ${i} ; \
>     done
> $ mount -t proc none /mnt/proc 
>
> # you need enought diskspace for the fetched headers and Packages 
> # so link it against a disk with enough space ~2GB
> # mkdir -p /export/yumspool 
> $ ln -s /export/yumspool /mnt/var/cache/yum
> # if you need additional Yum locations 
> # $ mkdir /mnt/etc/yum.repos.d/
> # $ cp MyRepository.repo /mnt/etc/yum.repos.d/
>
> # then start installing rpms using yum with 
> # a: groupinstall
> # b: install \* for everything but 1G might be not enought diskspace :)
>
> $ yum --installroot=/mnt -y groupinstall core base 
> # or 
> # $ yum --installroot=/mnt -y install \* 
>
> $ cat <<EOF > /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
> EOF 
>
> # you need to enable shadow authentication in this installation
> # first get every installed username (daemon depending)
> $ for user in `cut -f1 -d':' /mnt/etc/passwd` ; do 
>    useropts=$(grep ${user} /mnt/etc/passwd | cut --fields=3- -d':') 
>    echo "${user}:x:${useropts}" >> /mnt/etc/passwd.new
>    # setting shadow passwords as in dom0
>    grep ${user} /etc/shadow >> /mnt/etc/shadow
>   done
> $ mv /mnt/etc/passwd.new /mnt/etc/passwd
> $ chmod 0400 /mnt/etc/shadow
>
> # after finishing the installation you can unount the filesystems
> # but you will get an umount error as the minilogd access the mountpoint
> # and blocks umount access 
>
> $ sync # flushing all changes to disk if needed 
> $ umount /mnt/proc 
> $ umount /mnt 
> # force it with -f force and -l lacy 
> # $ umount -fl /mnt
> adding the disk to your config and booting should be working ...
> Kind regards
> Michael Lang
>
> > Thanks
> > Joao Correia
Very good howtos Michael Lang and Michael Kress!!!!!!!. Oe questio: can 
i do the same to install centos 3.8 domU on Centos 4.4 under xen 3.0.3 
using rpms provided by xensource???
Thanks ..


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> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
--
CL Martinez
carlopmart {at} gmail {d0t} com

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