Fix replication factor for scale-1 variant, and add an -ephemeral variant

README.md

@@ -37,7 +37,7 @@ and though they still seem to work you can get around that with a v1.14+ kubectl
 
 ### Maintaining your own kustomization
 
-`kubectl apply -k` takes a siungle overlay, meaning that you can't compose different overlays from this repo.
+`kubectl apply -k` takes a single overlay, meaning that you can't compose different overlays from this repo.
 You'll probably want to maintain your own variant.
 One option is to keep kubernets-kafka as a git submodule and edit the relative path from an example variant.
 

variants/scale-1-ephemeral/kafka-scale1-overrides.json

@@ -0,0 +1,6 @@
+[
+  {"op": "add", "path": "/spec/template/spec/containers/0/command/-", "value": "--override"},
+  {"op": "add", "path": "/spec/template/spec/containers/0/command/-", "value": "default.replication.factor=1"},
+  {"op": "add", "path": "/spec/template/spec/containers/0/command/-", "value": "--override"},
+  {"op": "add", "path": "/spec/template/spec/containers/0/command/-", "value": "min.insync.replicas=1"}
+]

variants/scale-1-ephemeral/kafka.yaml

@@ -0,0 +1,13 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: kafka
+  namespace: kafka
+spec:
+  replicas: 1
+  template:
+    spec:
+      volumes:
+      - name: data
+        emptyDir: {}
+  volumeClaimTemplates: []

variants/scale-1-ephemeral/kustomization.yaml

@@ -0,0 +1,13 @@
+bases:
+- ../../kafka
+- ../../zookeeper
+patchesStrategicMerge:
+- kafka.yaml
+- zookeeper.yaml
+patchesJson6902:
+- target:
+    group: apps
+    version: v1
+    kind: StatefulSet
+    name: kafka
+  path: kafka-scale1-overrides.json

variants/scale-1-ephemeral/zookeeper.yaml

@@ -0,0 +1,47 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: pzoo
+  namespace: kafka
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pzoo
+  namespace: kafka
+spec:
+  replicas: 1
+  template:
+    spec:
+      initContainers:
+      - name: init-config
+        env:
+        - name: PZOO_REPLICAS
+          value: '1'
+        - name: ZOO_REPLICAS
+          value: '0'
+      volumes:
+      - name: data
+        emptyDir: {}
+  volumeClaimTemplates: []
+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: zoo
+  namespace: kafka
+spec:
+  replicas: 0
+  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: '1'
+        - name: ZOO_REPLICAS
+          value: '0'
+        - name: ID_OFFSET
+          value: '2'

variants/scale-1/kafka-scale1-overrides.json

@@ -0,0 +1,6 @@
+[
+  {"op": "add", "path": "/spec/template/spec/containers/0/command/-", "value": "--override"},
+  {"op": "add", "path": "/spec/template/spec/containers/0/command/-", "value": "default.replication.factor=1"},
+  {"op": "add", "path": "/spec/template/spec/containers/0/command/-", "value": "--override"},
+  {"op": "add", "path": "/spec/template/spec/containers/0/command/-", "value": "min.insync.replicas=1"}
+]

variants/scale-1/kustomization.yaml

@@ -4,3 +4,10 @@ bases:
 patchesStrategicMerge:
 - kafka.yaml
 - zookeeper.yaml
+patchesJson6902:
+- target:
+    group: apps
+    version: v1
+    kind: StatefulSet
+    name: kafka
+  path: kafka-scale1-overrides.json