Crazy fast zookeeper start, crazy cheap so we can scale up

native/kustomization.yaml

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+bases:
+- ../nonroot
+patchesStrategicMerge:
+- native-image-zookeeper.yaml

native/native-image-zookeeper.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pzoo
+spec:
+  template:
+    spec:
+      containers:
+      - name: zookeeper
+        image: solsson/kafka:native-zookeeper-server-start@sha256:fb7b0ea81e3490f088de1491afcdde8f7531477f125781c726dfbbffb2695a01
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: zoo
+spec:
+  template:
+    spec:
+      containers:
+      - name: zookeeper
+        image: solsson/kafka:native-zookeeper-server-start@sha256:fb7b0ea81e3490f088de1491afcdde8f7531477f125781c726dfbbffb2695a01

variants/scale-6-9/kafka-6.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: kafka
+spec:
+  replicas: 3

variants/scale-6-9/kustomization.yaml

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+bases:
+- ../../native
+patchesStrategicMerge:
+- zoo-9.yaml
+- kafka-6.yaml
+patchesJson6902:
+# The nonroot image is distroless and doesn't support a shell that the prestop hook needs
+- target:
+    group: apps
+    version: v1
+    kind: StatefulSet
+    name: zoo
+  path: lifecycle-remove.json
+# The nonroot image is distroless and has neither shell nor the nc command
+- target:
+    group: apps
+    version: v1
+    kind: StatefulSet
+    name: zoo
+  path: zoo-readiness-without-shell.yaml

variants/scale-6-9/lifecycle-remove.json

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+[
+  {"op": "remove", "path": "/spec/template/spec/containers/0/lifecycle"}
+]
+

variants/scale-6-9/zoo-9.yaml

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+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pzoo
+  namespace: kafka
+spec:
+  replicas: 0
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: zoo
+  namespace: kafka
+spec:
+  replicas: 9
+  template:
+    spec:
+      initContainers:
+      - name: init-config
+        env:
+        # There's no validation on these numbers adding up to a coherent zk config, so watch out
+        - name: PZOO_REPLICAS
+          value: '0'
+        - name: REPLICAS
+          value: '9'
+        - name: ID_OFFSET
+          value: '1'
+      containers:
+      - name: zookeeper
+        env:
+        - name: REPLICAS
+          value: '9'

variants/scale-6-9/zoo-readiness-without-shell.yaml

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+- op: replace
+  path: /spec/template/spec/containers/0/readinessProbe
+  value:
+    tcpSocket:
+      port: 2181