Re: kernel-plus PXE virt-install with Xen?

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On Tue, Oct 10, 2017 at 2:32 PM, Johnny Hughes <johnny@xxxxxxxxxx> wrote:
On 10/10/2017 01:46 PM, PJ Welsh wrote:
> I'm trying to figure out how to replace the vmlinuz and initrd.img from
> CentOS 7.4 with "fixed" kernel-plus versions in order create CentOS 7.4
> VM's. So far I'm stuck booting via 7.3 install, adding new kernel-plus
> and upgrading to 7.4. I've not found any complete Google answers and was
> looking for help making sure I choose the correct approach.
> I've tried to build an initrd.img from a kernel-plus booting system via
> "mkinitrd -f -v /boot/initrd.img $(uname -r)", but the file size is less
> than half the one from CentOS 7.4 (17MB -vs- 47MB). I'm not even sure I
> can just replace those files yet either.
> Any help going the correct path?

I have not had time to do this yet .. BUT .. you can edit the lorax
template to to use kernel-plus instead of kernel (and new repodata)..
then rerun lorax to get a bootable tree and boot.iso

You would then need a tree with the new kernel-plus* packages instead of
the kernel-* packages

This bug kind of explains the process:

(look for lorax in the bug)

I do want to create a process and tree somewhere for this (likely on  Sometime soon after I finish the i386 distro
release (hopefully that is this week .. next week for some kind of
bootable x86_64 Xen PV solution).

The good news is, the 7.5 RHEL kernel Source RPMs should have Kevin's
patch in it and it should work as released on Xen PV.

CentOS-virt mailing list

I can report full success based on your information! Thank you!
For anyone interested, the general steps I choose for the test was:
* On a build system:
  yum install lorax #if not already there
  Edit /usr/share/lorax/runtime-install.tmpl and change the "installpkg kernel" to "installpkg kernel-plus".
  rsync -a ~/results/ PXEINSTALL.SERVER:/YOUR/DIR/os/x86_64/ #location of CentOS 7.4 original install was located
  rsync -a results/images/pxeboot/{vmlinuz,initrd.img} PXEINSTALL.SERVER:/var/lib/tftpboot/linux-install/YOUR/DIR/ 
* Kickstart created with required package "kernel-plus" and "repo --name=centosplus --baseurl=http://CHOOSE/A/MIRROR/7/centosplus/x86_64/" as additions original kickstart
* On xen server you can now run virt-install with ks=http://PXEINSTALL.SERVER/PATH/TO/kickstart.cfg"

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