👁️ Reduce the complexity and overhead of the vm.max-map-count update utility

Author: ndebuhr

kubernetes/node-max-map-count.yaml

@@ -4,29 +4,25 @@ metadata:
   name: vm-max-map-count
   namespace: kube-system
   labels:
-    k8s-app: vm-max-map-count
+    app: vm-max-map-count
 spec:
   selector:
     matchLabels:
-      name: vm-max-map-count
+      app: vm-max-map-count
   template:
     metadata:
       labels:
-        name: vm-max-map-count
+        app: vm-max-map-count
     spec:
       hostPID: true
-      containers:
+      initContainers:
       - name: vm-max-map-count
-        image: gcr.io/google-containers/startup-script:v1
+        image: ubuntu:20.04
         imagePullPolicy: Always
         securityContext:
           privileged: true
-        env:
-        - name: STARTUP_SCRIPT
-          value: |
-            #! /bin/bash
-            sleep 5
-            while true; do
-              sysctl -w vm.max_map_count=262144
-              sleep 300
-            done
+        command: ["/bin/bash", "-c"]
+        args: ["sysctl -w vm.max_map_count=262144"]
+      containers:
+      - name: pause
+        image: gcr.io/google_containers/pause:3.2