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docs: retain NFS controller privileges in the CSI example #3521

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bad89ae
docs: retain NFS controller privileges in the CSI example
cloudonly Oct 31, 2026
5220f93
docs: grant only SYS_ADMIN for NFS controller mounts
cloudonly Nov 4, 2026
80efad5
docs: restore upstream NFS controller privileges
cloudonly Nov 4, 2026
901068b
docs: explain the CSI Envoy sidecar setup
cloudonly Nov 10, 2026
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16 changes: 16 additions & 0 deletions docs/guides/csi-deployment.md
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Expand Up @@ -185,6 +185,15 @@ data:

#### 2. Envoy Sidecar in `csi-nfs-controller` Deployment

The `envoy-proxy` sidecar shares `socket-dir` (`/csi`) with the CSI driver
container and mounts the Envoy configuration (`envoy-config`), the Service DNS
serving certificate (`servicedns-certs`), and the Pod Identity trust bundle
(`podidentity-ca`). Even when the CSI driver container itself requires elevated
privileges (such as [the upstream `csi-nfs-controller` manifest](../../hack/third_party/csi-driver-nfs/deploy/csi-nfs-controller.yaml)),
the Envoy sidecar runs with a restricted `securityContext`
(`allowPrivilegeEscalation: false`, `readOnlyRootFilesystem: true`, and all
capabilities dropped).

```yaml
apiVersion: apps/v1
kind: Deployment
Expand All @@ -205,9 +214,16 @@ spec:
# Upstream CSI NFS driver container listening on local Unix socket
- name: nfs
image: registry.k8s.io/sig-storage/nfsplugin:v4.13.4
securityContext:
privileged: true
args:
- "--nodeid=$(NODE_ID)"
- "--endpoint=unix:///csi/csi.sock"
env:
- name: NODE_ID
valueFrom:
fieldRef:
fieldPath: spec.nodeName
volumeMounts:
- name: socket-dir
mountPath: /csi
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