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Container Management > Kubernetes > How to scale replicas of a Kubernetes Deployment

How to scale replicas of a Kubernetes Deployment

Author: Venkata Sudhakar

The below example shows how to scale replicas of a Kubernetes Deployment. You can observe Kubernetes is either terminating existing Pods or creating new Pods depending on the scaling requirements.

$ kubectl get deployments
NAME   READY   UP-TO-DATE   AVAILABLE   AGE
http   4/4     4            4           7m26s
$ kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
http-774bb756bb-5rrcm   1/1     Running   0          104s
http-774bb756bb-fkm8l   1/1     Running   0          7m36s
http-774bb756bb-g94pf   1/1     Running   0          104s
http-774bb756bb-qrhw8   1/1     Running   0          7m36s

$ kubectl scale --replicas=2 deployment http
deployment.apps/http scaled

$ kubectl get pods
NAME                    READY   STATUS        RESTARTS   AGE
http-774bb756bb-fkm8l   1/1     Running       0          8m3s
http-774bb756bb-g94pf   0/1     Terminating   0          2m11s
http-774bb756bb-qrhw8   1/1     Running       0          8m3s

$ kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
http-774bb756bb-fkm8l   1/1     Running   0          8m8s
http-774bb756bb-qrhw8   1/1     Running   0          8m8s
$ kubectl scale --replicas=5 deployment http
deployment.apps/http scaled

$ kubectl get pods
NAME                    READY   STATUS              RESTARTS   AGE
http-774bb756bb-57jfk   0/1     ContainerCreating   0          5s
http-774bb756bb-fkm8l   1/1     Running             0          8m31s
http-774bb756bb-jjgkx   0/1     ContainerCreating   0          5s
http-774bb756bb-phmhd   0/1     ContainerCreating   0          5s
http-774bb756bb-qrhw8   1/1     Running             0          8m31s

$ kubectl get pods
NAME                    READY   STATUS    RESTARTS   AGE
http-774bb756bb-57jfk   1/1     Running   0          22s
http-774bb756bb-fkm8l   1/1     Running   0          8m48s
http-774bb756bb-jjgkx   1/1     Running   0          22s
http-774bb756bb-phmhd   1/1     Running   0          22s
http-774bb756bb-qrhw8   1/1     Running   0          8m48s

$ kubectl get deployments
NAME   READY   UP-TO-DATE   AVAILABLE   AGE
http   5/5     5            5           10m

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