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bce5f8267f
Doc updates related to for minio RELEASE.2022-08-22T23-53-06Z
- Adds note about idempotent delete markers, which diverges from
standard S3
- Adds info about queueing and re-attempting failed bucket replication
tasks
- Cleans up `mc ilm add` examples throughout the docs that did not
reflect recent flag name changes
- Adds a missing metric to Metrics and Alerts
Closes #537
319 lines
12 KiB
ReStructuredText
319 lines
12 KiB
ReStructuredText
.. _minio-bucket-versioning:
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=================
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Bucket Versioning
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=================
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.. default-domain:: minio
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.. contents:: Table of Contents
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:local:
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:depth: 2
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Overview
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--------
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MinIO supports keeping multiple "versions" of an object in a single bucket.
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Write operations which would normally overwrite an existing object instead
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result in the creation of a new versioned object. MinIO versioning protects from
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unintended overwrites and deletions while providing support for "undoing" a
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write operation. Bucket versioning is a prerequisite for configuring
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:ref:`object locking and retention rules <minio-object-locking>`.
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For versioned buckets, any write operation that mutates an object results in a
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new version of that object with a unique version ID. MinIO marks the "latest"
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version of the object that clients retrieve by default. Clients can then
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explicitly choose to list, retrieve, or remove a specific object version.
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.. card-carousel:: 1
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.. card:: Object with Single Version
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.. image:: /images/retention/minio-versioning-single-version.svg
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:alt: Object with single version
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:align: center
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MinIO adds a unique version ID to each object as part of write operations.
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.. card:: Object with Multiple Versions
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.. image:: /images/retention/minio-versioning-multiple-versions.svg
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:alt: Object with Multiple Versions
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:align: center
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MinIO retains all versions of an object and marks the most recent
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version as the "latest".
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.. card:: Retrieving the Latest Object Version
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.. image:: /images/retention/minio-versioning-retrieve-latest-version.svg
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:alt: Object with Multiple Versions
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:align: center
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.. card:: Retrieving a Specific Object Version
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.. image:: /images/retention/minio-versioning-retrieve-single-version.svg
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:alt: Object with Multiple Versions
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:align: center
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:ref:`Deleting <minio-bucket-versioning-delete>` an object results in a special
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``DeleteMarker`` tombstone that marks an object as deleted while retaining
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all previous versions of that object.
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Versioning is Per-Namespace
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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MinIO uses the full namespace (the bucket and path to an object) for each object
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as part of determining object uniqueness. For example, all of the following
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namespaces are "unique" objects, where mutations of each object result in
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the creation of new object versions *at that namespace*:
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.. code-block:: shell
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databucket/object.blob
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databucket/blobs/object.blob
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blobbucket/object.blob
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blobbucket/blobs/object.blob
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While ``object.blob`` might be the same binary across all namespaces,
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MinIO only enforces versioning with a specific namespace and therefore
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considers each ``object.blob`` above as distinct and unique.
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Versioning and Storage Capacity
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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MinIO does not perform incremental or differential-type versioning. For
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mutation-heavy workloads, this may result in substantial drive usage by
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older or aged object versions.
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For example, consider a 1GB object containing log data. An application
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appends 100MB of data to the log and uploads to MinIO. MinIO would then contain
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both the 1GB and 1.1GB versions of the object. If the application repeated
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this process every day for 10 days, the bucket would eventually contain more
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than 14GB of data associated to a single object.
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MinIO supports configuring configuring :ref:`object lifecycle management rules
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<minio-lifecycle-management>` to automatically expire or transition aged
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object versions and free up storage capacity. For example, you can configure
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a rule to automatically expire object versions 90 days after they become
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non-current (i.e. no longer the "latest" version of that object). See
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:ref:`MinIO Object Expiration <minio-lifecycle-management-expiration>` for
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more information.
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You can alternatively perform manual removal of object versions using the
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following commands:
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- :mc-cmd:`mc rm --versions` - Removes all versions of an object.
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- :mc-cmd:`mc rm --versions --older-than <mc rm --older-than>` -
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Removes all versions of an object older than the specified calendar date.
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.. _minio-bucket-versioning-id:
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Version ID Generation
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~~~~~~~~~~~~~~~~~~~~~
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MinIO generates a unique and immutable identifier for each versioned object as
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part of write operations. Each object version ID consists of a 128-bit
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fixed-size :rfc:`UUIDv4 <4122#section-4.4>`. UUID generation is sufficiently
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random to ensure high likelihood of uniqueness for any environment, are
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computationally difficult to guess, and do not require centralized registration
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process and authority to guarantee uniqueness.
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.. image:: /images/retention/minio-versioning-multiple-versions.svg
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:alt: Object with Multiple Versions
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:width: 600px
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:align: center
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MinIO does not support client-managed version ID allocation. All version ID
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generation is handled by the MinIO server process.
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For objects created while versioning is disabled or suspended, MinIO
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uses a ``null`` version ID. You can access or remove these objects by specifying
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``null`` as the version ID as part of S3 operations.
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.. _minio-bucket-versioning-delete:
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Versioned Delete Operations
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Performing a ``DELETE`` operation on a versioned object creates a
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0-byte ``DeleteMarker`` as the latest version of that object. Clients performing
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``GET`` operations on that object do not return any results, as MinIO does not
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return the ``DeleteMarker`` back as part of the response. Similarly, performing
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a ``LIST`` operation by default returns only objects which are *not* a
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``DeleteMarker``.
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.. admonition:: MinIO Implements Idempotent Delete Markers
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:class: note
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.. versionchanged:: RELEASE.2022-08-22T23-53-06Z
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Standard S3 implementations can create multiple sequential delete markers for the same object when processing simple ``DeleteObject`` requests with no version identifier.
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See the S3 docs for details on :s3-docs:`managing delete markers <ManagingDelMarkers.html#RemDelMarker>``
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MinIO diverges from standard S3 implementation by avoiding this potential duplication of delete markers.
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When processing a ``Delete`` request with no version identifier, MinIO creates at most one Delete Marker for the specified object.
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MinIO **does not** share S3's behavior in creating multiple sequential delete markers.
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To permanently delete an object version, perform the ``DELETE`` operation and
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specify the version ID of the object to delete. Versioned delete operations
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are **irreversible**.
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.. card-carousel:: 1
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.. card:: Deleting an Object
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.. image:: /images/retention/minio-versioning-delete-object.svg
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:alt: Deleting an Object
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:align: center
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Performing a ``DELETE`` operation on a versioned object produces a
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``DeleteMarker`` for that object.
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.. card:: Reading a Deleted Object
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.. image:: /images/retention/minio-versioning-retrieve-deleted-object.svg
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:alt: Object with Multiple Versions
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:align: center
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Clients by default retrieve the "latest" object version. MinIO returns
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a ``404``-like response if the latest version is a ``DeleteMarker``.
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.. card:: Retrieve Previous Version of Deleted Object
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.. image:: /images/retention/minio-versioning-retrieve-version-before-delete.svg
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:alt: Retrieve Version of Deleted Object
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:align: center
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Clients can retrieve any previous version of the object by specifying the
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version ID, even if the "Latest" version is a ``DeleteMarker``.
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.. card:: Delete a Specific Object Version
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.. image:: /images/retention/minio-versioning-delete-specific-version.svg
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:alt: Retrieve Version of Deleted Object
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:align: center
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Clients can delete a specific object version by specifying the version ID
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as part of the ``DELETE`` operation. Deleting a specific version is
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**permanent** and does not result in the creation of a ``DeleteMarker``.
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The following :mc:`mc` commands operate on ``DeleteMarkers`` or versioned
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objects:
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- Use :mc-cmd:`mc ls --versions` to view all versions of an object,
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including delete markers.
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- Use :mc-cmd:`mc cp --version-id=UUID ... <mc cp --version-id>` to
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retrieve the version of the "deleted" object with matching ``UUID``.
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- Use :mc-cmd:`mc rm --version-id=UUID ... <mc rm --version-id>` to delete
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the version of the object with matching ``UUID``.
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- Use :mc-cmd:`mc rm --versions` to delete *all* versions of an object.
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Tutorials
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---------
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Enable Bucket Versioning
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~~~~~~~~~~~~~~~~~~~~~~~~
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You can enable versioning using the MinIO Console, the MinIO :mc:`mc` CLI, or
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using an S3-compatible SDK. Versioning is a bucket-scoped feature. You cannot
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enable versioning on only a prefix or subset of objects in a bucket.
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.. tab-set::
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.. tab-item:: MinIO Console
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Select the :guilabel:`Buckets` section of the MinIO Console to access bucket creation and management functions. You can use the :octicon:`search` :guilabel:`Search` bar to filter the list.
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.. image:: /images/minio-console/console-bucket.png
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:width: 600px
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:alt: MinIO Console Bucket Management
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:align: center
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Each bucket row has a :guilabel:`Manage` button that opens the management view for that bucket.
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.. image:: /images/minio-console/console-bucket-manage.png
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:width: 600px
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:alt: MinIO Console Bucket Management
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:align: center
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Toggle the :guilabel:`Versioning` field to enable versioning on the bucket.
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The MinIO Console also supports enabling versioning as part of bucket
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creation. See :ref:`minio-console-admin-buckets` for more information on
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bucket management using the MinIO Console.
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.. tab-item:: MinIO CLI
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Use the :mc-cmd:`mc version enable` command to enable versioning on an
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existing bucket:
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.. code-block:: shell
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:class: copyable
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mc version ALIAS/BUCKET
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- Replace ``ALIAS`` with the :mc:`alias <mc alias>` of a configured
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MinIO deployment.
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- Replace ``BUCKET`` with the
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:mc-cmd:`target bucket <mc version ALIAS>` on which to enable
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versioning.
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Objects created prior to enabling versioning have a
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``null`` :ref:`version ID <minio-bucket-versioning-id>`.
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Suspend Bucket Versioning
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~~~~~~~~~~~~~~~~~~~~~~~~~
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You can suspend bucket versioning at any time using the MinIO Console, the
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MinIO :mc:`mc` CLI, or using an S3-compatible SDK.
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.. tab-set::
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.. tab-item:: MinIO Console
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Select the :guilabel:`Buckets` section of the MinIO Console to access bucket creation and management functions. You can use the :octicon:`search` :guilabel:`Search` bar to filter the list.
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.. image:: /images/minio-console/console-bucket.png
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:width: 600px
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:alt: MinIO Console Bucket Management
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:align: center
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Each bucket row has a :guilabel:`Manage` button that opens the management view for that bucket.
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.. image:: /images/minio-console/console-bucket-manage.png
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:width: 600px
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:alt: MinIO Console Bucket Management
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:align: center
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Select the :guilabel:`Versioning` field and follow the instructions to suspend versioning in the bucket.
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See :ref:`minio-console-admin-buckets` for more information on bucket
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management using the MinIO Console.
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.. tab-item:: MinIO CLI
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Use the :mc-cmd:`mc version suspend` command to enable versioning on an
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existing bucket:
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.. code-block:: shell
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:class: copyable
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mc version suspend ALIAS/BUCKET
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- Replace ``ALIAS`` with the :mc:`alias <mc alias>` of a configured
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MinIO deployment.
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- Replace ``BUCKET`` with the
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:mc-cmd:`target bucket <mc version ALIAS>` on which to disable
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versioning.
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Objects created while versioning is suspended are assigned a ``null`` :ref:`version ID <minio-bucket-versioning-id>`.
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Any mutations to an object while versioning is suspended result in overwriting that ``null`` versioned object.
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MinIO does not remove or otherwise alter existing versioned objects as part of suspending versioning.
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Clients can continue interacting with any existing object versions in the bucket.
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