Scaling up an application

In the previous section, we deployed an application with one replica; let's scale its deployment to two replicas.

The use case of running multiple replicas is to enable high availability for an application. To scale our deployment, run the following commands:

$ kubectl scale deployment nginx –replicas=2
deployment.apps/nginx scaled
$ kubectl get deployment nginx
NAME    READY   UP-TO-DATE   AVAILABLE   AGE
nginx   2/2     2            2           5d17h
$ kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
nginx-7df9c6ff5-chnrk   1/1 ...