Fix issue with scheduler mutex. Update k8s motd with new kubedashboard

url

dockerfiles/k8s/motd

@@ -20,9 +20,7 @@
 
  3. (Optional) Initialize kube-dashboard:
 
- curl -L -s https://git.io/kube-dashboard  | sed 's/targetPort: 9090/targetPort: 9090\n  type: LoadBalancer/' | \
-    kubectl apply -f -
-
+curl -L -s https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml  | sed 's/targetPort: 8443/targetPort: 8443\n  type: LoadBalancer/' |    kubectl apply -f -
 
                           The PWK team.
 

scheduler/scheduler.go

@@ -310,10 +310,11 @@ func (s *scheduler) Start() error {
 	})
 	s.event.On(event.PLAYGROUND_NEW, func(playgroundId string, args ...interface{}) {
 		s.mx.Lock()
-		defer s.mx.Unlock()
 
 		log.Printf("EVENT: Playground New %s\n", playgroundId)
 
+		// Don't defer lock as updatePlaygrounds will lock again
+		s.mx.Unlock()
 		// We just update all playgrounds we manage to be safe. This is pretty fast anyway and this event should be fairly rare
 		s.updatePlaygrounds()
 	})