As a preparation for the Buster update we need to switch the KVM machine type for the Ganeti cluster to pc-i440fx-2.8 (the hardware provided by qemu 2.8). Otherwise we wouldn't be able to migrate machines between Stretch and Buster nodes (which would default to pc-i440fx-3.1). One the Buster migration is complete we switch back to pc-i440fx-3.1.
This requires the following steps:
1. sudo gnt-cluster modify --hypervisor-parameters kvm:machine_version=pc-i440fx-2.8
2. Restart all instances of the cluster. A reboot from within the OS isn't sufficient, this needs to be rebooted on the Ganeti level so that the KVM instance gets restarted (kind of comparable to resetting a computer with the power button). There's a new cookbook for this: sre.ganeti.reboot-vm
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