feat(launch_config_drift): get node info from kube api not imds

Author: mmcgarr

config/plugin/launch_config_drift.sh

@@ -4,9 +4,26 @@ OK=0
 NONOK=1
 UNKNOWN=2
 
-export $(cat /run/metadata/coreos | xargs)
+# Get instance ID from Kubernetes node providerID
+if [ -z "${NODE_NAME}" ]; then
+    exit $UNKNOWN
+fi
+
+provider_id="$(curl -s -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" \
+  --cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt \
+  "https://${KUBERNETES_SERVICE_HOST}:${KUBERNETES_SERVICE_PORT}/api/v1/nodes/${NODE_NAME}" \
+  2>/dev/null | jq -r '.spec.providerID')"
 
-instance_id="${COREOS_EC2_INSTANCE_ID}"
+if [ -z "${provider_id}" ]; then
+    exit $UNKNOWN
+fi
+
+# Extract instance ID from providerID (format: aws:///region/instance-id)
+instance_id="$(echo "${provider_id}" | awk -F'/' '{print $NF}')"
+
+if [ -z "${instance_id}" ]; then
+    exit $UNKNOWN
+fi
 
 instances="$(aws autoscaling describe-auto-scaling-instances --instance-ids "${instance_id}")"