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?
Thanks PJ
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:
https://bugs.centos.org/view.php?id=13763
(look for lorax in the bug)
I do want to create a process and tree somewhere for this (likely on buildlogs.centos.org). 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.
Thanks! I starting the process now. I'll let you know how it goes. pjwelsh
On Tue, Oct 10, 2017 at 2:32 PM, Johnny Hughes johnny@centos.org 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:
https://bugs.centos.org/view.php?id=13763
(look for lorax in the bug)
I do want to create a process and tree somewhere for this (likely on buildlogs.centos.org). 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 CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
On Tue, Oct 10, 2017 at 2:32 PM, Johnny Hughes johnny@centos.org 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:
https://bugs.centos.org/view.php?id=13763
(look for lorax in the bug)
I do want to create a process and tree somewhere for this (likely on buildlogs.centos.org). 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 CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
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". DEFAULTKERNEL=kernel-plus lorax -p Centos-Minimal -v 7 -r 7.4 -s http://mirrors.us.kernel.org/centos/7/os/x86_64/ -s http://mirrors.us.kernel.org/centos/7/updates/x86_64/ -s http://mirrors.us.kernel.org/centos/7/centosplus/x86_64/ ./results/ 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"
Thanks pjwelsh
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Johnny Hughes -
PJ Welsh