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Add phase 1 of validation tightening.

Browse Source 
https://github.com/kubernetes/enhancements/blob/master/keps/sig-storage/177-volume-snapshot/tighten-validation-webhook-crd.md

1. Ratcheting validation webhook server image
2. Controller labels invalid objects
3. Unit tests for webhook
4. Deployment README and example deployment method with certs
5. Update top-level README

Racheting validation:
1. webhook is strict on create
2. webhook is strict on updates where the existing object passes strict validation
3. webhook is relaxed on updates where the existing object fails strict validation (allows finalizer removal, status update, deletion, etc)

Additionally the validating wehook server will perform immutability
checks on scenario 2 above.
This commit is contained in:
Andi Li
2020-08-04 18:55:54 +00:00
parent db336e8070
commit 42b6b374cf
73 changed files with 12815 additions and 21 deletions
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9
examples/kubernetes/invalid-snapshot.yaml Normal file
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apiVersion: snapshot.storage.k8s.io/v1beta1
kind: VolumeSnapshot
metadata:
name: new-snapshot-demo
spec:
volumeSnapshotClassName: csi-hostpath-snapclass
source: # Only one of the two fields should be set for a snapshot. Therefore this snapshot is invalid.
persistentVolumeClaimName: pvc
volumeSnapshotContentName: vsc