f770724740
Currently when nova launches a guest instance, libvirt uses current default KVM/QEMU machine type for guest. If compute node is running on RHEL-7.3.0, then the guest will be given rhel-7.3.0 machine type. If in future, deployment has added additional compute nodes which uses a newer RHEL version, the guests launched on those compute nodes will get a newer machine type. eg. rhel-7.4.0 It is now impossible to migrate guests from RHEL-7.4 based compute nodes to a RHEL-7.3 based compute nodes, since RHEL-7.3 won't know about RHEL-7.4 machine type. To deal with this problem, the proposed change will explicitly set machine type across all compute nodes during deployment. Now even if additional compute nodes are added to deployment with newer OS version, instances spawned on those will get the default machine type explicitly set during initial deployment, allowing migrating instances from higher machine type compute nodes to lower machine type compute nodes. Closes-Bug: 1806529 Change-Id: Ib57bfbb94e2acdfb3bb3a828ee3b085bf68d3b4c
8 lines
283 B
YAML
8 lines
283 B
YAML
---
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features:
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Add parameter `NovaHWMachineType` which allows to explicitly
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set machine_type across all compute nodes during deployment,
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to allow migration compatibility from compute nodes with higher
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host OS version to compute nodes with lower host OS version.
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