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Showing content from https://kubernetes-csi.github.io/docs/kubernetes-changelog.html below:

Kubernetes Changelog - Kubernetes CSI Developer Documentation

1. 1. Introduction
2. 2. Developing a CSI Driver for Kubernetes
3. 1. 2.1. Versioning, Support, Compatibility Policies
   2. 2.2. Kubernetes Changelog
   3. 2.3. Kubernetes Cluster Controllers
   4. 1. 2.3.1. Snapshot Controller
      2. 2.3.2. Snapshot Validation Webhook
      3. 2.3.3. CSI Proxy
   5. 2.4. Sidecar Containers
   6. 1. 2.4.1. external-attacher
      2. 2.4.2. external-provisioner
      3. 2.4.3. external-resizer
      4. 2.4.4. external-snapshotter
      5. 2.4.5. livenessprobe
      6. 2.4.6. node-driver-registrar
      7. 2.4.7. cluster-driver-registrar
      8. 2.4.8. external-health-monitor-controller
      9. 2.4.9. external-health-monitor-agent
      10. 2.4.10. external-snapshot-metadata
   7. 2.5. CSI objects
   8. 1. 2.5.1. CSIDriver Object
      2. 2.5.2. CSINode Object
   9. 2.6. Features
   10. 1. 2.6.1. Secrets & Credentials
       2. 1. 2.6.1.1. StorageClass Secrets
          2. 2.6.1.2. VolumeSnapshotClass Secrets
          3. 2.6.1.3. VolumeGroupSnapshotClass Secrets
       3. 2.6.2. Topology
       4. 2.6.3. Raw Block Volume
       5. 2.6.4. Skip Attach
       6. 2.6.5. Pod Info on Mount
       7. 2.6.6. Volume expansion
       8. 2.6.7. Data Sources
       9. 1. 2.6.7.1. Cloning
          2. 2.6.7.2. Volume Snapshot & Restore
          3. 2.6.7.3. Volume Group Snapshot & Restore
       10. 2.6.8. Ephemeral Local Volumes
       11. 2.6.9. Volume Limits
       12. 2.6.10. Storage Capacity Tracking
       13. 2.6.11. Volume Health Monitoring
       14. 2.6.12. Token Requests
       15. 2.6.13. FSGroup Support
       16. 2.6.14. CSI Windows
       17. 2.6.15. Volume Mode Conversion
       18. 2.6.16. Cross-Namespace Data Sources
       19. 2.6.17. Changed Block Tracking
       20. 2.6.18. Volume Attributes Class
4. 3. Deploying a CSI Driver on Kubernetes
5. 1. 3.1. Example
6. 4. Driver Testing
7. 1. 4.1. Unit Testing
   2. 4.2. Functional Testing
8. 5. Drivers
9. 6. API Reference
10. 1. 6.1. Volume Snapshot
11. 7. Troubleshooting

This page summarizes major CSI changes made in each Kubernetes release. For details on individual features, visit the Features section.

• Removals:
  • Removal of CSI Migration for GCE PD
• Deprecations:
  • Ceph RBD in-tree plugin
  • Ceph FS in-tree plugin

• Beta
  • ReadWriteOncePod Access mode
  • Speed up SELinux volume relabeling using mounts
  • CSI node expand secret
  • Prevent unauthorized volume mode converstion
• Alpha
  • VolumeGroupSnapshot

• GA
  • Delegate fsgroup to CSI driver
  • Azure File CSI migration
  • vSphere CSI migration
• Alpha
  • Cross namespace volume provisioning

• GA
  • CSI ephemeral inline volumes
  • Core CSI migration
  • AWS EBS CSI migration
  • GCE PD CSI migration
• Beta
  • vSphere CSI Migration (on by default)
  • Portworx CSI Migration (off-by-default)
• Alpha
  • CSI node expand secret
  • Speed up SELinux volume relabeling using mounts

• In-tree plugin removal:
  • AWS EBS
  • Azure Disk

• GA
  • Volume expansion
  • Storage capacity tracking
  • Azure Disk CSI Migration
  • OpenStack Cinder CSI Migration
• Beta
  • Volume populator
• Alpha
  • SELinux relabeling with mount options
  • Prevent volume mode conversion

• GA
  • CSI fsgroup policy
  • Non-recusrive fsgroup ownership
  • Generic ephemeral volumes
• Beta
  • Delegate fsgroup to CSI driver
  • Azure Disk CSI Migration (on-by-default)
  • AWS EBS CSI Migration (on-by-default)
  • GCE PD CSI Migration (on-by-default)
• Alpha
  • Recover from Expansion Failure
  • Honor PV Reclaim Policy
  • RBD CSI Migration
  • Portworx CSI migration

• GA
  • Windows CSI (CSI-Proxy API v1)
  • Pod token requests (CSIServiceAccountToken)
• Alpha
  • ReadWriteOncePod access mode
  • Delegate fsgroup to CSI driver
  • Generic data populators

• Beta
  • Pod token requests (CSIServiceAccountToken)
  • Storage capacity tracking
  • Generic ephemeral volumes

• Kubelet no longer creates the target_path for NodePublishVolume in accordance with the CSI spec. Kubelet also no longer checks if staging and target paths are mounts or corrupted. CSI drivers need to be idempotent and do any necessary mount verification.

• GA
  • Volume snapshots and restore
• Beta
  • CSI fsgroup policy
  • Non-recusrive fsgroup ownership
• Alpha
  • Pod token requests (CSIServiceAccountToken)

• Behaviour of NodeExpandVolume being called between NodeStage and NodePublish is deprecated for CSI volumes. CSI drivers should support calling NodeExpandVolume after NodePublish if they have node EXPAND_VOLUME capability

• Beta
  • CSI on Windows
  • CSI migration for AzureDisk and vSphere drivers
• Alpha
  • CSI fsgroup policy
  • Generic ephemeral volumes
  • Storage capacity tracking
  • Volume health monitoring

• storage.k8s.io/v1beta1 CSIDriver object has been deprecated and will be removed in a future release.
• In a future release, kubelet will no longer create the CSI NodePublishVolume target directory, in accordance with the CSI specification. CSI drivers may need to be updated accordingly to properly create and process the target path.

• GA
  • Raw block volumes
  • Volume cloning
  • Skip attach
  • Pod info on mount
• Beta
  • CSI migration for Openstack cinder driver.
• Alpha
  • CSI on Windows
• storage.k8s.io/v1 CSIDriver object introduced.

• CSI 0.3 support has been removed. CSI 0.3 drivers will no longer function.

• storage.k8s.io/v1beta1 CSINode object has been deprecated and will be removed in a future release.

• GA
  • Volume topology
  • Volume limits
• Beta
  • Volume snapshots and restore
  • CSI migration for AWS EBS and GCE PD drivers
• storage.k8s.io/v1 CSINode object introduced.

• Beta
  • Volume cloning
  • Volume expansion
  • Ephemeral local volumes

• Volume capacity usage metrics
• Alpha
  • Volume cloning
  • Ephemeral local volumes
  • Resizing secrets

• csi.storage.k8s.io/v1alpha1 CSINodeInfo and CSIDriver CRDs are no longer supported.

• Beta
  • Topology
  • Raw block
  • Skip attach
  • Pod info on mount
• Alpha
  • Volume expansion
• storage.k8s.io/v1beta1 CSINode and CSIDriver objects introduced.

• CSI spec 0.2 and 0.3 are deprecated and support will be removed in Kubernetes 1.17.

• GA support added for CSI spec 1.0.

Kubelet device plugin registration is enabled by default, which requires CSI plugins to use driver-registrar:v0.3.0 to register with kubelet.

• Alpha
  • Snapshots
  • Topology
  • Skip attach
  • Pod info on mount
• csi.storage.k8s.io/v1alpha1 CSINodeInfo and CSIDriver CRDs were introduced and have to be installed before deploying a CSI driver.

• Beta support added for CSI spec 0.3.
• Alpha
  • Raw block

• CSI spec 0.1 is no longer supported.

• Beta support added for CSI spec 0.2. This added optional NodeStageVolume and NodeUnstageVolume calls which map to Kubernetes MountDevice and UnmountDevice operations.

• Alpha support added for CSI spec 0.1.

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