gh-53 Allow to control how to talk to k8s in installer

docs/installation.md

@@ -27,8 +27,27 @@ $ sh start-in-k8s
 The newly created replication controller might take some time to spin up a new pod. After the pod is up, the application should become
 available. See the usage section to get started.
 
+The installer uses the following defaults to talk to kubernetes:
+
+- *Cluster address:* http://localhost:8080
+- *kubectl path:* kubectl
+
+You can control the above by setting the envars: `KUBE_ADMIN_CLUSTER_ADDR` and `KUBE_ADMIN_KUBECTL_PATH`
+
 # Upgrade
 
 Untill the install script supports upgrade, use:
 
     kubectl rolling-update kube-admin-<someversion> -f rc-manifest.yml --namespace="kube-system"
+
+# Alternative install options
+
+At this moment, the application has no dedicated back-end and it is formed only of static files (javascript, css, html) therefore
+is quite simple to just serve this files. For example, using python simple HTTP server module:
+
+    cd dist # dir containing index.html and the compiled static files
+    python2 -m SimpleHTTPServer
+
+Now the app is served at localhost:8000
+
+To simplify, I just provided the install in kubernetes option, but if there is need for other ways to serve the app, they should be quite easy to add.

packaging/kubernetes/start-in-k8s

@@ -1,13 +1,26 @@
 #!/usr/bin/bash
 set -e
 
-KUBE_CLUSTER=http://localhost:8080
-KBIN="kubectl -s $KUBE_CLUSTER"
 
+if [ -z "$KUBE_ADMIN_CLUSTER_ADDR" ]; then
+    CLUSTER_ADDR=http://localhost:8080
+else
+    CLUSTER_ADDR="$KUBE_ADMIN_CLUSTER_ADDR"
+fi
+
+if [ -z "$KUBE_ADMIN_KUBECTL_PATH" ]; then
+    KUBECTL_PATH=kubectl
+else
+    KUBECTL_PATH="$KUBE_ADMIN_KUBECTL_PATH"
+fi
+
+KBIN="$KUBECTL_PATH -s $CLUSTER_ADDR"
+
+echo "Using kubectl: $KBIN"
 
 already_created() {
     ret_val=1
-    if [ $($KBIN get $1 --namespace=kube-system -l k8s-app=kube-admin |awk '{print $1}'|tail -1) = "kube-admin" ];
+    if [[ $($KBIN get $1 --namespace=kube-system -l k8s-app=kube-admin |awk '{print $1}'|tail -1) == *"kube-admin"* ]];
     then
         return 0
     fi

packaging/templates/rc-manifest.yml.j2

@@ -4,18 +4,18 @@ metadata:
   name: kube-admin-{{ version }}
   namespace: kube-system
   labels:
-    k8s-app: kube-admin-{{ version }}
+    k8s-app: kube-admin
     version: {{ version }}
     kubernetes.io/cluster-service: "true"
 spec:
   replicas: 1
   selector:
-    k8s-app: kube-admin-{{ version }}
+    k8s-app: kube-admin
     version: {{ version }}
   template:
     metadata:
       labels:
-        k8s-app: kube-admin-{{ version }}
+        k8s-app: kube-admin
         version: {{ version }}
         kubernetes.io/cluster-service: "true"
     spec: