WIP: allow operator to run both in- and out- of cluster.

Dockerfile

@@ -0,0 +1,5 @@
+FROM alpine
+ADD postgres-operator /usr/local/bin
+
+CMD ["/usr/local/bin/postgres-operator"] 
+

pkg/controller/operator.go

@@ -31,21 +31,23 @@ type Options struct {
     KubeConfig string
 }
 
-func KubernetesConfig(options Options) *rest.Config {
+func KubernetesConfig(options Options) (config *rest.Config, is_in_cluster bool) {
+	var err     error
+	is_in_cluster = (options.KubeConfig == "")
+	if !is_in_cluster {
+		/* out-of-cluster process */
 		rules := clientcmd.NewDefaultClientConfigLoadingRules()
 		overrides := &clientcmd.ConfigOverrides{}
-
-	if options.KubeConfig != "" {
 		rules.ExplicitPath = options.KubeConfig
+		config, err = clientcmd.NewNonInteractiveDeferredLoadingClientConfig(rules, overrides).ClientConfig()
+	} else {
+		/* in-cluster pod */
+		config, err = rest.InClusterConfig()
 	}
-
-	config, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(rules, overrides).ClientConfig()
-
 	if err != nil {
 		log.Fatalf("Couldn't get Kubernetes default config: %s", err)
 	}
-
-	return config
+	return
 }
 
 func newKubernetesSpiloClient(c *rest.Config) (*rest.RESTClient, error) {

pkg/controller/spilo.go

@@ -22,33 +22,39 @@ type SpiloOperator struct {
 	EtcdClient *etcd.EtcdClient
 }
 
-func New(options Options) *SpiloOperator {
-	config := KubernetesConfig(options)
 
-	clientSet, err := kubernetes.NewForConfig(config)
-	if err != nil {
-		log.Fatalf("Couldn't create Kubernetes client: %s", err)
-	}
-
-    etcdService, _ := clientSet.Services("default").Get("etcd-client")
+func getEtcdServiceName(cls *kubernetes.Clientset, config *rest.Config, is_in_cluster bool) (etcdServiceName string) {
+	etcdService, _ := cls.Services("default").Get("etcd-client")
+	if is_in_cluster {
 		if len(etcdService.Spec.Ports) != 1 {
-        log.Fatalln("Can't find Etcd cluster")
+			log.Fatal("Can't find Etcd service named 'etcd-client'")
 		}
+		etcdServiceName = fmt.Sprintf("%s.%s.svc.cluster.local", etcdService.Name, etcdService.Namespace)
+	} else {
 		ports := etcdService.Spec.Ports[0]
-	nodeurl, _ := url.Parse(config.Host)
-
 		if ports.NodePort == 0 {
-        log.Fatalln("Etcd port is not exposed")
+			log.Fatal("Etcd port is not exposed\nHint: add NodePort to your Etcd service")
 		}
+		nodeurl, _ := url.Parse(config.Host)
+		etcdServiceName = fmt.Sprintf("http://%s:%d", strings.Split(nodeurl.Host, ":")[0], ports.NodePort)
+	}
+	return
+}
 
-	etcdHostOutside := fmt.Sprintf("http://%s:%d", strings.Split(nodeurl.Host, ":")[0], ports.NodePort)
+func New(options Options) *SpiloOperator {
+	config, is_in_cluster := KubernetesConfig(options)
 
 	spiloClient, err := newKubernetesSpiloClient(config)
 	if err != nil {
 		log.Fatalf("Couldn't create Spilo client: %s", err)
 	}
 
-    etcdClient := etcd.NewEctdClient(etcdHostOutside)
+	clientSet, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		log.Fatalf("Couldn't create Kubernetes client: %s", err)
+	}
+
+	etcdClient := etcd.NewEctdClient(getEtcdServiceName(clientSet, config, is_in_cluster))
 
 	operator := &SpiloOperator{
 		Options:     options,

postgres-operator.yaml

@@ -0,0 +1,19 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: postgres-operator
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        name: postgres-operator
+    spec:
+      containers:
+      - name: postgres-operator
+        image: postgres-operator:0.1
+        env:
+        - name: MY_POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace