Create step8.md

Author: Splaktar

step8.md

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+# 8. Scale up your app
+
+Estimated time: 18 min remaining
+
+One of the powerful features offered by Kubernetes is how easy it is to scale your application. Suppose you suddenly 
+need more capacity for your application; you can simply tell the replication controller to manage a new number of 
+replicas for your pod:
+```sh
+$ kubectl scale rc hello-node --replicas=3
+$ kubectl get pods
+NAME               READY     STATUS    RESTARTS   AGE
+hello-node-6uzt8   1/1       Running   0          8m
+hello-node-gxhty   1/1       Running   0          34s
+hello-node-z2odh   1/1       Running   0          34s
+```
+You now have three replicas of your application, each running independently on the cluster with the load balancer 
+you created earlier and serving traffic to all of them.
+```sh
+$ kubectl get rc hello-node
+CONTROLLER   CONTAINER(S)   IMAGE(S)                    SELECTOR         REPLICAS
+hello-node   hello-node     gcr.io/..../hello-node:v1   run=hello-node   3
+```
+Note the **declarative approach** here - rather than starting or stopping new instances you declare how many instances 
+you want to be running. Kubernetes reconciliation loops simply make sure the reality matches what you requested and 
+take action if needed.
+
+Here’s a diagram summarizing the state of our Kubernetes cluster:
+
+![gke-diagram](https://codelabs.developers.google.com/codelabs/hello-kubernetes/img/img-13.png)
+
+#### [Go to step 9](step9.md)
+#### [Go back to step 7](step7.md)