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13.2. Configure eviction and run strategies

You can configure eviction strategies for virtual machines (VMs) or for the cluster. The default eviction strategy is LiveMigrate. The VM LiveMigrate eviction strategy ensures that a virtual machine instance (VMI) is not interrupted if the node is placed into maintenance or drained. VMIs with this eviction strategy are live migrated to another node.

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표 13.1. Cluster eviction strategies
Eviction strategyDescriptionInterrupts workflowBlocks upgrades

LiveMigrate 1

Prioritizes workload continuity over upgrades.

No

Yes 2

LiveMigrateIfPossible

Prioritizes upgrades over workload continuity to ensure that the environment is updated.

Yes

No

None 3

Shuts down VMs with no eviction strategy.

Yes

No

  1. Default eviction strategy for multi-node clusters.
  2. If a VM blocks an upgrade, you must shut down the VM manually.
  3. Default eviction strategy for single-node OpenShift.

13.2.1. Configuring a VM eviction strategy using the CLI
링크 복사

You can configure an eviction strategy for a virtual machine (VM) by using the command line.

중요

The default eviction strategy is LiveMigrate. A non-migratable VM with a LiveMigrate eviction strategy might prevent nodes from draining or block an infrastructure upgrade because the VM is not evicted from the node. This situation causes a migration to remain in a Pending or Scheduling state unless you shut down the VM manually.

You must set the eviction strategy of non-migratable VMs to LiveMigrateIfPossible, which does not block an upgrade, or to None, for VMs that should not be migrated.

Prerequisites

  • You have installed the OpenShift CLI (oc).

Procedure

  1. Edit the VirtualMachine resource by running the following command: 

    $ oc edit vm <vm_name> -n <namespace>

    Example eviction strategy: 

    apiVersion: kubevirt.io/v1
kind: VirtualMachine
metadata:
  name: <vm_name>
spec:
  template:
    spec:
      evictionStrategy: LiveMigrateIfPossible
# ...
    • spec.template.spec.evictionStrategy defines the eviction strategy. The default value is LiveMigrate.

  2. Restart the VM to apply the changes: 

    $ virtctl restart <vm_name> -n <namespace>
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