only allow one Metacontroller instance to be active at a time

docs/_guide/install.md

@@ -29,7 +29,7 @@ Replace `<user>` and `<domain>` above based on the account you use to authentica
 ```sh
 # Create 'metacontroller' namespace, service account, and role/binding.
 kubectl apply -f {{ site.repo_raw }}/manifests/metacontroller-rbac.yaml
-# Create CRDs for Metacontroller APIs, and the Metacontroller Deployment.
+# Create CRDs for Metacontroller APIs, and the Metacontroller StatefulSet.
 kubectl apply -f {{ site.repo_raw }}/manifests/metacontroller.yaml
 ```
 
@@ -39,7 +39,7 @@ If you prefer to build and host your own images, please see the
 ## Configuration
 
 The Metacontroller server has a few settings that can be configured
-with command-line flags (by editing the Metacontroller Deployment
+with command-line flags (by editing the Metacontroller StatefulSet
 in `manifests/metacontroller.yaml`):
 
 | Flag | Description |

examples/bluegreen/test.sh

@@ -12,12 +12,14 @@ trap cleanup EXIT
 
 set -ex
 
+bgd="bluegreendeployments"
+
 echo "Install controller..."
 kubectl create configmap bluegreen-controller -n metacontroller --from-file=sync.js
 kubectl apply -f bluegreen-controller.yaml
 
 echo "Wait until CRD is available..."
-until kubectl get bgd; do sleep 1; done
+until kubectl get $bgd; do sleep 1; done
 
 echo "Create an object..."
 kubectl apply -f my-bluegreen.yaml
@@ -27,14 +29,14 @@ until [[ "$(kubectl get rs nginx-blue -o 'jsonpath={.status.readyReplicas}')" -e
 until [[ "$(kubectl get rs nginx-green -o 'jsonpath={.status.replicas}')" -eq 0 ]]; do sleep 1; done
 
 echo "Trigger a rollout..."
-kubectl patch bgd nginx --type=merge -p '{"spec":{"template":{"metadata":{"labels":{"new":"label"}}}}}'
+kubectl patch $bgd nginx --type=merge -p '{"spec":{"template":{"metadata":{"labels":{"new":"label"}}}}}'
 
 echo "Wait for nginx-green RS to be active..."
 until [[ "$(kubectl get rs nginx-green -o 'jsonpath={.status.readyReplicas}')" -eq 3 ]]; do sleep 1; done
 until [[ "$(kubectl get rs nginx-blue -o 'jsonpath={.status.replicas}')" -eq 0 ]]; do sleep 1; done
 
 echo "Trigger another rollout..."
-kubectl patch bgd nginx --type=merge -p '{"spec":{"template":{"metadata":{"labels":{"new2":"label2"}}}}}'
+kubectl patch $bgd nginx --type=merge -p '{"spec":{"template":{"metadata":{"labels":{"new2":"label2"}}}}}'
 
 echo "Wait for nginx-blue RS to be active..."
 until [[ "$(kubectl get rs nginx-blue -o 'jsonpath={.status.readyReplicas}')" -eq 3 ]]; do sleep 1; done

examples/catset/test.sh

@@ -12,27 +12,29 @@ trap cleanup EXIT
 
 set -ex
 
+cs="catsets"
+
 echo "Install controller..."
 kubectl create configmap catset-controller -n metacontroller --from-file=sync.js
 kubectl apply -f catset-controller.yaml
 
 echo "Wait until CRD is available..."
-until kubectl get catsets; do sleep 1; done
+until kubectl get $cs; do sleep 1; done
 
 echo "Create an object..."
 kubectl apply -f my-catset.yaml
 
 echo "Wait for 3 Pods to be Ready..."
-until [[ "$(kubectl get cs nginx-backend -o 'jsonpath={.status.readyReplicas}')" -eq 3 ]]; do sleep 1; done
+until [[ "$(kubectl get $cs nginx-backend -o 'jsonpath={.status.readyReplicas}')" -eq 3 ]]; do sleep 1; done
 
 echo "Scale up to 4 replicas..."
-kubectl patch catset nginx-backend --type=merge -p '{"spec":{"replicas":4}}'
+kubectl patch $cs nginx-backend --type=merge -p '{"spec":{"replicas":4}}'
 
 echo "Wait for 4 Pods to be Ready..."
-until [[ "$(kubectl get cs nginx-backend -o 'jsonpath={.status.readyReplicas}')" -eq 4 ]]; do sleep 1; done
+until [[ "$(kubectl get $cs nginx-backend -o 'jsonpath={.status.readyReplicas}')" -eq 4 ]]; do sleep 1; done
 
 echo "Scale down to 2 replicas..."
-kubectl patch catset nginx-backend --type=merge -p '{"spec":{"replicas":2}}'
+kubectl patch $cs nginx-backend --type=merge -p '{"spec":{"replicas":2}}'
 
 echo "Wait for 2 Pods to be Ready..."
-until [[ "$(kubectl get cs nginx-backend -o 'jsonpath={.status.readyReplicas}')" -eq 2 ]]; do sleep 1; done
+until [[ "$(kubectl get $cs nginx-backend -o 'jsonpath={.status.readyReplicas}')" -eq 2 ]]; do sleep 1; done

examples/indexedjob/test.sh

@@ -12,18 +12,20 @@ trap cleanup EXIT
 
 set -ex
 
+ij="indexedjobs"
+
 echo "Install controller..."
 kubectl create configmap indexedjob-controller -n metacontroller --from-file=sync.py
 kubectl apply -f indexedjob-controller.yaml
 
 echo "Wait until CRD is available..."
-until kubectl get indexedjobs; do sleep 1; done
+until kubectl get $ij; do sleep 1; done
 
 echo "Create an object..."
 kubectl apply -f my-indexedjob.yaml
 
 echo "Wait for 10 successful completions..."
-until [[ "$(kubectl get indexedjob print-index -o 'jsonpath={.status.succeeded}')" -eq 10 ]]; do sleep 1; done
+until [[ "$(kubectl get $ij print-index -o 'jsonpath={.status.succeeded}')" -eq 10 ]]; do sleep 1; done
 
 echo "Check that correct index is printed..."
 if [[ "$(kubectl logs print-index-9)" != "9" ]]; then

manifests/dev/args.yaml

@@ -1,6 +1,6 @@
 # Override args for development mode.
-apiVersion: apps/v1beta1
-kind: Deployment
+apiVersion: apps/v1beta2
+kind: StatefulSet
 metadata:
   name: metacontroller
   namespace: metacontroller

manifests/dev/image.yaml

@@ -1,6 +1,6 @@
 # Override image for development mode (skaffold fills in the tag).
-apiVersion: apps/v1beta1
-kind: Deployment
+apiVersion: apps/v1beta2
+kind: StatefulSet
 metadata:
   name: metacontroller
   namespace: metacontroller

manifests/metacontroller.yaml

@@ -43,8 +43,8 @@ spec:
     singular: controllerrevision
     kind: ControllerRevision
 ---
-apiVersion: apps/v1beta1
-kind: Deployment
+apiVersion: apps/v1beta2
+kind: StatefulSet
 metadata:
   name: metacontroller
   namespace: metacontroller
@@ -55,6 +55,7 @@ spec:
   selector:
     matchLabels:
       app: metacontroller
+  serviceName: ""
   template:
     metadata:
       labels: