AWS::DLM::LifecyclePolicy RetainRule

[Custom snapshot and AMI policies only] Specifies a retention rule for snapshots created by snapshot policies, or for AMIs created by AMI policies.

Note

For snapshot policies that have an ArchiveRule, this retention rule applies to standard tier retention. When the retention threshold is met, snapshots are moved from the standard to the archive tier.

For snapshot policies that do not have an ArchiveRule, snapshots are permanently deleted when this retention threshold is met.

You can retain snapshots based on either a count or a time interval.

• Count-based retention

  You must specify Count. If you specify an ArchiveRule for the schedule, then you can specify a retention count of 0 to archive snapshots immediately after creation. If you specify a FastRestoreRule, ShareRule, or a CrossRegionCopyRule, then you must specify a retention count of 1 or more.

• Age-based retention

  You must specify Interval and IntervalUnit. If you specify an ArchiveRule for the schedule, then you can specify a retention interval of 0 days to archive snapshots immediately after creation. If you specify a FastRestoreRule, ShareRule, or a CrossRegionCopyRule, then you must specify a retention interval of 1 day or more.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{
  "Count" : Integer,
  "Interval" : Integer,
  "IntervalUnit" : String
}

YAML

  Count: Integer
  Interval: Integer
  IntervalUnit: String

Properties

Count

The number of snapshots to retain for each volume, up to a maximum of 1000. For example if you want to retain a maximum of three snapshots, specify 3. When the fourth snapshot is created, the oldest retained snapshot is deleted, or it is moved to the archive tier if you have specified an ArchiveRule.

Required: No

Type: Integer

Minimum: 0

Maximum: 1000

Update requires: No interruption

Interval

The amount of time to retain each snapshot. The maximum is 100 years. This is equivalent to 1200 months, 5200 weeks, or 36500 days.

Required: No

Type: Integer

Minimum: 0

Update requires: No interruption

IntervalUnit

The unit of time for time-based retention. For example, to retain snapshots for 3 months, specify Interval=3 and IntervalUnit=MONTHS. Once the snapshot has been retained for 3 months, it is deleted, or it is moved to the archive tier if you have specified an ArchiveRule.

Required: No

Type: String

Allowed values: DAYS | WEEKS | MONTHS | YEARS

Update requires: No interruption