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8.5. Automatically pruning images

Images that are no longer required by the system due to age, status, or exceed limits are automatically pruned. Cluster administrators can configure the pruning custom resource, or delete it to disable it.

Prerequisites

  • Cluster administrator permissions.
  • Install the oc CLI.

Procedure

  • Verify that the object named imagepruners.imageregistry.operator.openshift.io/cluster contains the following spec and status fields: 
spec:
  schedule: 0 0 * * *
1 

  suspend: false
2 

  keepTagRevisions: 3
3 

  keepYoungerThanDuration: 60m
4 

  keepYoungerThan: 3600000000000
5 

  resources: {}
6 

  affinity: {}
7 

  nodeSelector: {}
8 

  tolerations: []
9 

  successfulJobsHistoryLimit: 3
10 

  failedJobsHistoryLimit: 3
11 

status:
  observedGeneration: 2
12 

  conditions:
13 

  - type: Available
    status: "True"
    lastTransitionTime: 2019-10-09T03:13:45
    reason: Ready
    message: "Periodic image pruner has been created."
  - type: Scheduled
    status: "True"
    lastTransitionTime: 2019-10-09T03:13:45
    reason: Scheduled
    message: "Image pruner job has been scheduled."
  - type: Failed
    staus: "False"
    lastTransitionTime: 2019-10-09T03:13:45
    reason: Succeeded
    message: "Most recent image pruning job succeeded."
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1
schedule: CronJob formatted schedule. This is an optional field, default is daily at midnight.
2
suspend: If set to true, the CronJob running pruning is suspended. This is an optional field, default is false. The initial value on new clusters is false.
3
keepTagRevisions: The number of revisions per tag to keep. This is an optional field, default is 3. The initial value is 3.
4
keepYoungerThanDuration: Retain images younger than this duration. This is an optional field. If a value is not specified, either keepYoungerThan or the default value 60m (60 minutes) is used.
5
keepYoungerThan: Deprecated. The same as keepYoungerThanDuration, but the duration is specified as an integer in nanoseconds. This is an optional field. When keepYoungerThanDuration is set, this field is ignored.
6
resources: Standard Pod resource requests and limits. This is an optional field.
7
affinity: Standard pod affinity. This is an optional field.
8
nodeSelector: Standard pod node selector for the image pruner pod. This is an optional field.
9
tolerations: Standard pod tolerations. This is an optional field.
10
successfulJobsHistoryLimit: The maximum number of successful jobs to retain. Must be >= 1 to ensure metrics are reported. This is an optional field, default is 3. The initial value is 3.
11
failedJobsHistoryLimit: The maximum number of failed jobs to retain. Must be >= 1 to ensure metrics are reported. This is an optional field, default is 3. The initial value is 3.
12
observedGeneration: The generation observed by the Operator.
13
conditions: The standard condition objects with the following types:
  • Available: Indicates if the pruning job has been created. Reasons can be Ready or Error.
  • Scheduled: Indicates if the next pruning job has been scheduled. Reasons can be Scheduled, Suspended, or Error.
  • Failed: Indicates if the most recent pruning job failed.
重要

The Image Registry Operator’s behavior for managing the pruner is orthogonal to the managementState specified on the Image Registry Operator’s ClusterOperator object. If the Image Registry Operator is not in the Managed state, the image pruner can still be configured and managed by the Pruning Custom Resource.

However, the managementState of the Image Registry Operator alters the behavior of the deployed image pruner job:

  • Managed: the --prune-registry flag for the image pruner is set to true.
  • Removed: the --prune-registry flag for the image pruner is set to false, meaning it only prunes image metatdata in etcd.
  • Unmanaged: the --prune-registry flag for the image pruner is set to false.
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