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Learning S3 Lifecycle Policies

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  5. Learning S3 Lifecycle Policies

A S3 lifecycle configuration is

  • a set of rules that define actions
  • Rules is applied to group of objects in S3.
  • an XML file, comprises a set of rules with predefined actions
  • S3 provides a set of API operations for managing lifecycle configuration on a bucket.
  • S3 stores the configuration as a lifecycle subresource that is attached to the bucket.
  • Configure the lifecycle by
    • Amazon S3 console
    • the AWS SDK wrapper libraries
  • two types of actions:
    • Transition actions—Define when objects transition to another storage class.
    • Expiration actions—Define when objects expire. Amazon S3 deletes expired objects on your behalf.

S3 supports following lifecycle transitions between storage classes using a lifecycle configuration:

  • transition from the STANDARD storage class to any other storage class.
  • transition from any storage class to GLACIER or DEEP_ARCHIVE storage classes.
  • transition from STANDARD_IA storage class to INTELLIGENT_TIERING or ONEZONE_IA storage classes.
  • transition from INTELLIGENT_TIERING storage class to ONEZONE_IA storage class.
  • transition from GLACIER storage class to DEEP_ARCHIVE storage class.

Storage class transitions have following constraints:

  • From STANDARD or STANDARD_IA storage class to INTELLIGENT_TIERING. following constraints apply:
    • For larger objects, there is a cost benefit for transitioning to INTELLIGENT_TIERING. Amazon S3 does not transition objects that are smaller than 128 KB to INTELLIGENT_TIERING storage class because it’s not cost effective.
  • From STANDARD storage classes to STANDARD_IA or ONEZONE_IA. following constraints apply:
    • For larger objects, there is a cost benefit for transitioning to STANDARD_IA or ONEZONE_IA. Amazon S3 does not transition objects that are smaller than 128 KB to STANDARD_IA or ONEZONE_IA storage classes because it’s not cost effective.
    • Objects must be stored at least 30 days in current storage class before you can transition them to STANDARD_IA or ONEZONE_IA. For example, you cannot create a lifecycle rule to transition objects to STANDARD_IA storage class one day after you create them.
    • Amazon S3 doesn’t transition objects within first 30 days because newer objects are often accessed more frequently or deleted sooner than is suitable for STANDARD_IA or ONEZONE_IA storage.
    • If you are transitioning noncurrent objects (in versioned buckets), you can transition only objects that are at least 30 days noncurrent to STANDARD_IA or ONEZONE_IA storage.
  • From STANDARD_IA storage class to ONEZONE_IA. following constraints apply:
    • Objects must be stored at least 30 days in STANDARD_IA storage class before you can transition them to ONEZONE_IA class.

Various metadata associated in XML, are

  • LifecycleConfiguration – It defines a rule that applies to an object with a key.
  • ID– ID element uniquely identifies a rule. A lifecycle configuration can have up to 1000 rules.
  • Prefix – Prefix are Object keys.
  • Status – Enabled or Disabled.
  • Transition – It is one of lifecycle actions of S3, specifying movement objects to another storage class.
  • Expiration – It specifies when objects expire.
    • In a non-versioned bucket, expiration permanently removes object.
    • In a versioned bucket, S3 will not take any action if there are one or more object versions and delete marker is current version.
    • It applies only to current version.

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