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--- wiki:ai:nvidia_gpu_operator_installation_and_upgrade [2026/07/20 11:49] – ssuresh
+++ wiki:ai:nvidia_gpu_operator_installation_and_upgrade [2026/07/20 16:53] (current) – ssuresh
@@ Line 198: / Line 198: @@
-=== Phase 5 — CUDA VectorAdd GPU test ===
+===== Phase 5 — CUDA VectorAdd GPU test =====
 <code ->
@@ Line 224: / Line 224: @@
 {{:wiki:ai:screenshot_2026-07-14_at_7.05.33 pm.png|}}
-==== Phase 6 — Upgrade the Operator====
+===== Phase 6 — Upgrade the Operator =====
 **Concept: **
@@ Line 330: / Line 330: @@
 </code>
+{{:wiki:ai:screenshot_2026-07-15_at_9.58.41 pm.png|}}
+**A2. Confirm the GPU is in use**
+Watch the build + burn progress, then check real GPU load from the driver pod:
+<code ->
+kubectl logs gpu-burn -f      # apt install → clone → make → then GPU burn output; Ctrl+C to stop following
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_9.58.54 pm.png|}}
+{{:wiki:ai:screenshot_2026-07-15_at_9.59.07 pm.png|}}
+<code ->
+DRIVER=$(kubectl get pods -n gpu-operator -l app=nvidia-driver-daemonset -o jsonpath='{.items[0].metadata.name}')
+kubectl exec -n gpu-operator $DRIVER -- nvidia-smi
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_10.01.34 pm.png|}}
+Once burning, nvidia-smi shows GPU-Util climbing toward 100%, memory in use, and gpu_burn listed in the Processes section — genuine GPU activity, i.e. a real ML workload stand-in.
+==== B — Understand what an upgrade will do (before touching anything) ====
+**B1. Pre-upgrade check: what's using the GPU?**
+<code ->
+kubectl get pods -A -o wide | grep -i gpu
+kubectl get pods
+</code>
+Always know what will be disrupted before upgrading.
+**B2. Inspect the Operator's built-in upgrade controls**
+<code ->
+kubectl get clusterpolicies -o yaml | grep -A 25 "upgradePolicy"
+kubectl get node $NODE -o jsonpath='{.metadata.labels.nvidia\.com/gpu-driver-upgrade-state}{"\n"}'
+</code>
+**Pause / resume automatic driver upgrades cluster-wide:**
+<code ->
+# Pause
+kubectl patch clusterpolicies/cluster-policy --type merge \
+  -p '{"spec":{"driver":{"upgradePolicy":{"autoUpgrade":false}}}}'
+# Resume
+kubectl patch clusterpolicies/cluster-policy --type merge \
+  -p '{"spec":{"driver":{"upgradePolicy":{"autoUpgrade":true}}}}'
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_10.04.48 pm.png|}}
+==== C — Simulate the disruptive part of a driver upgrade ====
+**C1. Cordon the node (maintenance mode)**
+<code ->
+kubectl cordon $NODE
+kubectl get node $NODE                  # STATUS: Ready,SchedulingDisabled
+</code>
+{{:wiki:ai:screenshot_2026-07-16_at_11.05.13 pm.png|}}
+{{:wiki:ai:screenshot_2026-07-16_at_11.05.54 pm.png|}}
+**C2. Drain the node → watch the workload get evicted**
+<code ->
+kubectl drain $NODE --ignore-daemonsets --delete-emptydir-data --force
+kubectl get pods                        # gpu-burn is gone (evicted)
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_10.41.31 pm.png|}}
+==== D — Do the actual upgrade & validate ====
+**D1. Uncordon first so the upgrade schedules cleanly**
+<code ->
+kubectl uncordon $NODE
+kubectl get node $NODE                  # back to Ready
+</code>
+**D2. Upgrade the GPU Operator**
+<code ->
+helm list -n gpu-operator
+helm search repo nvidia/gpu-operator --versions | head
+</code>
+If a newer version exists, run the corrected upgrade (Part I, Phase 6.3). If already newest, you performed a real upgrade earlier in the story — the observation below is the point. Watch which pods restart:
+<code ->
+kubectl get pods -n gpu-operator -w     # Ctrl+C when settled
+</code>
+**D3. Validate after upgrade**
+<code ->
+kubectl get pods -n gpu-operator
+kubectl get nodes -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.status.allocatable.nvidia\.com/gpu}{"\n"}{end}'   # expect 1
+kubectl apply -f cuda-vectoradd.yaml
+sleep 25
+kubectl logs cuda-vectoradd             # expect: Test PASSED
+kubectl delete -f cuda-vectoradd.yaml
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_10.47.02 pm.png|}}
+==== E — Restore & learn the production lesson ====
+**E1. Restore the workload**
+<code ->
+kubectl apply -f gpu-burn.yaml
+kubectl get pods
+</code>
+**E2. Inference with replicas + PodDisruptionBudget (why production has many nodes)**
+Free the GPU first so the inference pod can schedule:
+<code ->
+kubectl delete -f gpu-burn.yaml --ignore-not-found
+</code>
+Deploy an "inference" service with 2 replicas and a PDB that forbids dropping to zero:
+<code ->
+cat > inference.yaml <<'EOF'
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: inference
+spec:
+  replicas: 2
+  selector:
+    matchLabels: { app: inference }
+  template:
+    metadata:
+      labels: { app: inference }
+    spec:
+      containers:
+      - name: inference
+        image: nvcr.io/nvidia/cuda:12.4.1-base-ubuntu22.04
+        command: ["bash","-c","sleep infinity"]
+        resources:
+          limits:
+            nvidia.com/gpu: 1
+---
+apiVersion: policy/v1
+kind: PodDisruptionBudget
+metadata:
+  name: inference-pdb
+spec:
+  minAvailable: 1
+  selector:
+    matchLabels: { app: inference }
+EOF
+kubectl apply -f inference.yaml
+kubectl get pods -l app=inference
+</code>
+See the PDB protect the service — try to drain and watch it get blocked:
+<code ->
+kubectl drain $NODE --ignore-daemonsets --delete-emptydir-data
+# Blocked: "Cannot evict pod ... would violate the pod's disruption budget"
+# Press Ctrl+C to stop the attempt
+kubectl uncordon $NODE
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_10.57.56 pm.png|}}
+===== PART III — ROLLBACK PLAN =====
+**Before any upgrade — capture your safety net**
+<code ->
+helm list -n gpu-operator                                             # note operator + version
+helm get values <RELEASE_NAME> -n gpu-operator > working-values.yaml  # save WORKING config (incl. k3s toolkit.env)
+helm history <RELEASE_NAME> -n gpu-operator                           # note current revision
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_11.18.24 pm.png|}}
+**Roll back the Operator release**
+<code ->
+helm history <RELEASE_NAME> -n gpu-operator          # see revisions
+helm rollback <RELEASE_NAME> -n gpu-operator          # previous revision
+# or a specific revision:
+helm rollback <RELEASE_NAME> 2 -n gpu-operator
+helm rollback <RELEASE_NAME> 1 -n gpu-operator
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_11.19.40 pm.png|}}
+**Simulation cleanup**
+<code ->
+kubectl delete -f gpu-burn.yaml --ignore-not-found
+kubectl delete -f inference.yaml --ignore-not-found
+kubectl delete pdb inference-pdb --ignore-not-found
+kubectl uncordon $NODE 2>/dev/null
+kubectl get pods
+</code>
+{{:wiki:ai:screenshot_2026-07-15_at_10.59.54 pm.png|}}
+**Cleanup (avoid a surprise bill!)**
+  * Pause between sessions: EC2 → Stop (compute stops billing; small EBS cost remains; public IP changes on restart unless you use an Elastic IP).
+  * Done for good: EC2 → Terminate (deletes instance + disk).
+  * Release any Elastic IP if you allocated one (billed even while unused).

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