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doc: update encryption doc for rbd

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Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
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Humble Chirammal 2020-10-08 11:06:03 +05:30 committed by mergify[bot]
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docs/deploy-rbd.md
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@ -183,13 +183,6 @@ The Helm chart is located in `charts/ceph-csi-rbd`.
Volumes provisioned with Ceph RBD do not have encryption by default. It is
possible to encrypt them with ceph-csi by using LUKS encryption.
To enable encryption set `encrypted` option in storage class to `"true"` and
set encryption passphrase in kubernetes secrets under `encryptionPassphrase` key.
To use different passphrase you need to have different storage classes and point
to a different K8s secrets (different `csi.storage.k8s.io/node-stage-secret-name`
and `csi.storage.k8s.io/node-stage-secret-namespace`).
### Life-cycle for encrypted volumes
**Create volume**:
@ -205,7 +198,7 @@ and `csi.storage.k8s.io/node-stage-secret-namespace`).
* on first time attachment
(no file system on the attached device, checked with blkid)
* new passphrase is generated and stored in selected KMS if KMS is in use
* device is encrypted with LUKS using a passphrase from K8s secrets
* device is encrypted with LUKS using a passphrase from K8s secrets.
* image-meta updated to "encrypted" in Ceph
* passphrase is retrieved from selected KMS if KMS is in use
* device is open and device path is changed to use a mapper device
@ -222,7 +215,13 @@ and `csi.storage.k8s.io/node-stage-secret-namespace`).
To encrypt rbd volumes with LUKS you need to set encryption passphrase in
secrets under `encryptionPassphrase` key and switch `encrypted` option in
StorageClass to `"true"`. This is not supported for storage classes that already
have PVs provisioned.
have PVs provisioned. The `node-stage-secret-name` and the `provisioner-secret-name`
should carry this key and value for encryption to work.
To use different passphrase you need to have different storage classes and point
to a different K8s secrets `csi.storage.k8s.io/node-stage-secret-name`
and `csi.storage.k8s.io/provisioner-secret-name` which carry new passphrase value
for `encryptionPassphrase` key in these secrets.
### Encryption KMS configuration