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

[Michael Lang <michi+xen@xxxxxxxxxxxxxxxxxxxx>]

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
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
-- 
Michael Lang <michi+xen@xxxxxxxxxxxxxxxxxxxx>


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