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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.

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01$ kubectl get deployments
02NAME   READY   UP-TO-DATE   AVAILABLE   AGE
03http   4/4     4            4           7m26s
04$ kubectl get pods
05NAME                    READY   STATUS    RESTARTS   AGE
06http-774bb756bb-5rrcm   1/1     Running   0          104s
07http-774bb756bb-fkm8l   1/1     Running   0          7m36s
08http-774bb756bb-g94pf   1/1     Running   0          104s
09http-774bb756bb-qrhw8   1/1     Running   0          7m36s
10 
11$ kubectl scale --replicas=2 deployment http
12deployment.apps/http scaled
13 
14$ kubectl get pods
15NAME                    READY   STATUS        RESTARTS   AGE
16http-774bb756bb-fkm8l   1/1     Running       0          8m3s
17http-774bb756bb-g94pf   0/1     Terminating   0          2m11s
18http-774bb756bb-qrhw8   1/1     Running       0          8m3s
19 
20$ kubectl get pods
21NAME                    READY   STATUS    RESTARTS   AGE
22http-774bb756bb-fkm8l   1/1     Running   0          8m8s
23http-774bb756bb-qrhw8   1/1     Running   0          8m8s
24$ kubectl scale --replicas=5 deployment http
25deployment.apps/http scaled
26 
27$ kubectl get pods
28NAME                    READY   STATUS              RESTARTS   AGE
29http-774bb756bb-57jfk   0/1     ContainerCreating   0          5s
30http-774bb756bb-fkm8l   1/1     Running             0          8m31s
31http-774bb756bb-jjgkx   0/1     ContainerCreating   0          5s
32http-774bb756bb-phmhd   0/1     ContainerCreating   0          5s
33http-774bb756bb-qrhw8   1/1     Running             0          8m31s
34 
35$ kubectl get pods
36NAME                    READY   STATUS    RESTARTS   AGE
37http-774bb756bb-57jfk   1/1     Running   0          22s
38http-774bb756bb-fkm8l   1/1     Running   0          8m48s
39http-774bb756bb-jjgkx   1/1     Running   0          22s
40http-774bb756bb-phmhd   1/1     Running   0          22s
41http-774bb756bb-qrhw8   1/1     Running   0          8m48s
42 
43$ kubectl get deployments
44NAME   READY   UP-TO-DATE   AVAILABLE   AGE
45http   5/5     5            5           10m

 
  


  
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