[CentOS] Building a UML image of CentOS 4.4

[Jed Reynolds]

Stephen Harris wrote:
> I'm wondering what the best way of building a UML image is; I tried the
> following based on documents I found on the web for FC2
>
>   mkdir -p $T/etc $T/dev $T/proc $T/sys $T/var/tmp $T/var/cache/yum \
>            $T/var/lock/rpm $T/var/cache/yum/update/headers \
>            $T/var/cache/yum/update/packages
>
>   touch $T/etc/fstab
>   mknod $T/dev/null c 1 3
>   chmod 666 $T/dev/null
>   mount --bind /proc $T/proc
>   mount --bind /sys $T/sys
>
>   rpm --root $T -Uvh --nodeps --force $UML/RPM/centos-release-4-4.2.i386.rpm \
>                                       $UML/RPM/yum-2.4.3-1.c4.noarch.rpm
>
>   yum -y -C --installroot=$T groupinstall "Base"
>
>
> ($T is a temp directory; $UML is where I'm storing my software)
>
> Unfortunately yum fails to run, complaining about repomd.xml files being
> missing.
>
>
>
> + rpm --root /var/tmp/bld.13824 -Uvh --nodeps --force /usr/local/uml/RPM/centos-release-4-4.2.i386.rpm /usr/local/uml/RPM/yum-2.4.3-1.c4.noarch.rpm
> warning: /usr/local/uml/RPM/centos-release-4-4.2.i386.rpm: V3 DSA signature: NOKEY, key ID 443e1821
> Preparing...                ########################################### [100%]
>    1:yum                    ########################################### [ 50%]
> error: %post(yum-2.4.3-1.c4.noarch) scriptlet failed, exit status 255
>    2:centos-release         ########################################### [100%]
> + yum -y -C --installroot=/var/tmp/bld.13824 groupinstall Base
> Setting up Group Process
> Setting up repositories
> Cannot open/read repomd.xml file for repository: update
> Cannot find repomd.xml file for update
> Error: Cannot find repomd.xml file for update
>
>
>
> (The yum rpm install problem is because chkconfig doesn't exist; not
> a problem.)
>
> Any ideas?
>   

I think I've seen this when I have a repository listed in 
/etc/yum.repos.d that I don't have access to. For example, I tried 
mirroring a CentOS mirror and left [centosplus] in my local.repo file, 
but didn't mirror the centosplus tree. Of course it didn't find 
repomd.xml for centosplus, so it just quit. So check the [update] repo 
pathing in your /etc/yum.repos.d/ file that you're actually using first.

I should mention that when I first saw the FC4 Xen howto that used yum 
to create a core filesystem, it worked for me when creating a UML 
rootfs. I'd consider that some of the newer Xen scripts in FC6 might 
also prove useful for creating UML root filesystems, too.

http://uml.jfdi.org/uml/Wiki.jsp?page=BuildingRootFileSystems
http://uml.jfdi.org/uml/Wiki.jsp?page=UMLRootFilesystems

Jed