Scale Up and Scale Down Pods

 Create a deployment called nginx

Note: K is referred to kubectl an alias which is set

$ k create deployment nginx --image=nginx
deployment.apps/nginx created

$ k get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-85b98978db-bjf5s   1/1     Running   0          2s

Lets scale up the pods to 10 by using scale and replicas

$ k scale deployment nginx --replicas=10
deployment.apps/nginx scaled

$ k get pods
NAME                     READY   STATUS              RESTARTS   AGE
nginx-85b98978db-2wtlk   0/1     Pending             0          2s
nginx-85b98978db-5jf5p   0/1     Pending             0          2s
nginx-85b98978db-7958z   0/1     ContainerCreating   0          2s
nginx-85b98978db-7lvcg   0/1     ContainerCreating   0          2s
nginx-85b98978db-98rqh   0/1     Pending             0          2s
nginx-85b98978db-b8l8s   0/1     ContainerCreating   0          2s
nginx-85b98978db-bjf5s   1/1     Running             0          85s
nginx-85b98978db-czlpb   0/1     ContainerCreating   0          2s
nginx-85b98978db-pncnz   0/1     ContainerCreating   0          2s
nginx-85b98978db-r2wzn   0/1     ContainerCreating   0          2s

$ k get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-85b98978db-2wtlk   1/1     Running   0          9s
nginx-85b98978db-5jf5p   1/1     Running   0          9s
nginx-85b98978db-7958z   1/1     Running   0          9s
nginx-85b98978db-7lvcg   1/1     Running   0          9s
nginx-85b98978db-98rqh   1/1     Running   0          9s
nginx-85b98978db-b8l8s   1/1     Running   0          9s
nginx-85b98978db-bjf5s   1/1     Running   0          92s
nginx-85b98978db-czlpb   1/1     Running   0          9s
nginx-85b98978db-pncnz   1/1     Running   0          9s
nginx-85b98978db-r2wzn   1/1     Running   0          9s

Lets scale down the pods to 1

$ k scale deployment nginx --replicas=1
deployment.apps/nginx scaled

$ k get pods
NAME                     READY   STATUS        RESTARTS   AGE
nginx-85b98978db-2wtlk   1/1     Terminating   0          50s
nginx-85b98978db-5jf5p   0/1     Terminating   0          50s
nginx-85b98978db-7958z   1/1     Terminating   0          50s
nginx-85b98978db-98rqh   1/1     Terminating   0          50s
nginx-85b98978db-b8l8s   1/1     Terminating   0          50s
nginx-85b98978db-bjf5s   1/1     Running       0          2m13s
nginx-85b98978db-czlpb   0/1     Terminating   0          50s
nginx-85b98978db-pncnz   1/1     Terminating   0          50s
nginx-85b98978db-r2wzn   1/1     Terminating   0          50s

$ k get pods
NAME                     READY   STATUS        RESTARTS   AGE
nginx-85b98978db-b8l8s   1/1     Terminating   0          54s
nginx-85b98978db-bjf5s   1/1     Running       0          2m17s
nginx-85b98978db-pncnz   1/1     Terminating   0          54s

$ k get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-85b98978db-bjf5s   1/1     Running   0          2m19s