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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, which ensures that a virtual machine instance (VMI) is not interrupted if the node is placed into maintenance or drained.

Expand
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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