Azure AKS Spot

az aks nodepool list \
  --cluster-name "<CLUSTER_NAME>" --resource-group "<RESOURCE_GROUP>" \
  --query "[].{name:name, vmSize:vmSize, priority:scaleSetPriority, count:count, mode:mode}" \
  -o table

# List deployments without PodDisruptionBudgets (single-replica or no PDB = higher eviction risk)
kubectl get deployments --all-namespaces -o json | \
  jq -r '.items[] | select(.spec.replicas == 1) | "\(.metadata.namespace)/\(.metadata.name)"'

# Check which pods already have spot tolerations
kubectl get pods --all-namespaces -o json | \
  jq -r '.items[] | select(.spec.tolerations[]?.key == "kubernetes.azure.com/scalesetpriority") | "\(.metadata.namespace)/\(.metadata.name)"'

# Keep existing regular node pool as fallback (min 1-2 nodes)
az aks nodepool update \
  --cluster-name "<CLUSTER_NAME>" --resource-group "<RESOURCE_GROUP>" \
  --name "<REGULAR_POOL>" \
  --enable-cluster-autoscaler --min-count 1 --max-count 3

# Add Spot pool for the majority of workload capacity
# -1 means pay up to on-demand price (no cap); set e.g. 0.05 to cap hourly spend
az aks nodepool add \
  --cluster-name "<CLUSTER_NAME>" --resource-group "<RESOURCE_GROUP>" \
  --name "<SPOT_POOL_NAME>" \
  --priority Spot --eviction-policy Delete --spot-max-price -1 \
  --node-vm-size "<VM_SIZE>" \
  --node-count 3 --min-count 0 --max-count 10 \
  --enable-cluster-autoscaler \
  --node-taints "kubernetes.azure.com/scalesetpriority=spot:NoSchedule" \
  --labels "kubernetes.azure.com/scalesetpriority=spot"

tolerations:
- key: "kubernetes.azure.com/scalesetpriority"
  operator: "Equal"
  value: "spot"
  effect: "NoSchedule"
nodeSelector:
  kubernetes.azure.com/scalesetpriority: spot

# Add to Deployment spec — terminationGracePeriodSeconds should be < 30s for Spot
spec:
  template:
    spec:
      terminationGracePeriodSeconds: 25
      containers:
      - name: <CONTAINER_NAME>
        lifecycle:
          preStop:
            exec:
              command: ["/bin/sh", "-c", "sleep 5"]  # Drain in-flight requests

kubectl apply -f - <<EOF
apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: <APP_NAME>-pdb
  namespace: <NAMESPACE>
spec:
  minAvailable: 1
  selector:
    matchLabels:
      app: <APP_NAME>
EOF