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How do you rollback a botched Xen upgrade?
When I am upgrading a KVM system, I can make a backup onto a different partition and restore the system from that partition if the upgrade fails, either by booting and restoring from a CD-ROM or a special disk partition created for that purpose
What does Xen offer in such a situation, especially if the upgrade resulted in some incompatibilities or the system is failing to boot properly?
Comments
I saw that most issues are with the new kernel. There are people compiling own or it fails to install properly. You will simply boot up in the old kernel and see from there, make sure you leave a long time to choose the kernel, I would suggest a minute, depending on how fast the node is and for ssd 30 seconds might be enough. If you blew up the boot folder (usually, from what I know very few people offer a separate boot partition), than that is tough, you need to askt he host to mount the disk and recover whatever files you have there or patch it up to make bootable again.
How is Xenpower configured in that respect? Is it possible to choose options at boot time in the recovery console etc?
No, you can choose in grub how long to display the choice.
However, if you have it with us, just open a ticket, I will boot it in the old kernel, no problem.