Kubectl scale

1 개요

kubectl scale

kubectl scale -n 네임스페이스 deploy/디플로이 --replicas=수량

kubectl scale -n dev deploy/nginx --replicas=3

2 스케일 업 1→4

$ kubectl get deployments
NAME                  DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
kubernetes-bootcamp   1         1         1            1           1m

$ kubectl scale deployments/kubernetes-bootcamp --replicas=4
deployment "kubernetes-bootcamp" scaled

$ kubectl get deployments
NAME                  DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
kubernetes-bootcamp   4         4         4            4           1m

$ kubectl get pods -o wide
NAME                                   READY     STATUS    RESTARTS   AGE  IP           NODE
kubernetes-bootcamp-5dbf48f7d4-6tvt9   1/1       Running   0          1m  172.18.0.7   host01
kubernetes-bootcamp-5dbf48f7d4-jhcs8   1/1       Running   0          1m  172.18.0.5   host01
kubernetes-bootcamp-5dbf48f7d4-mgsjj   1/1       Running   0          3m  172.18.0.4   host01
kubernetes-bootcamp-5dbf48f7d4-v5h6b   1/1       Running   0          1m  172.18.0.6   host01

3 스케일 다운 4→2

$ kubectl scale deployments/kubernetes-bootcamp --replicas=2
deployment "kubernetes-bootcamp" scaled

$ kubectl get deployments
NAME                  DESIRED   CURRENT   UP-TO-DATE   AVAILABLE   AGE
kubernetes-bootcamp   2         2         2            2           13m

$ kubectl get pods -o wide
NAME                                   READY     STATUS        RESTARTS   AGE      IP           NODE
kubernetes-bootcamp-5dbf48f7d4-6tvt9   1/1       Terminating   0          11m      172.18.0.7   host01
kubernetes-bootcamp-5dbf48f7d4-jhcs8   1/1       Terminating   0          11m      172.18.0.5   host01
kubernetes-bootcamp-5dbf48f7d4-mgsjj   1/1       Running       0          13m      172.18.0.4   host01
kubernetes-bootcamp-5dbf48f7d4-v5h6b   1/1       Running       0          11m      172.18.0.6   host01

$ kubectl get pods -o wide
NAME                                   READY     STATUS    RESTARTS   AGE  IP           NODE
kubernetes-bootcamp-5dbf48f7d4-mgsjj   1/1       Running   0          16m  172.18.0.4   host01
kubernetes-bootcamp-5dbf48f7d4-v5h6b   1/1       Running   0          14m  172.18.0.6   host01

4 히스토리 확인

$ kubectl describe deployments/kubernetes-bootcamp | tail
  ----           ------  ------
  Available      True    MinimumReplicasAvailable
OldReplicaSets:  <none>
NewReplicaSet:   kubernetes-bootcamp-5dbf48f7d4 (2/2 replicas created)
Events:
  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
  Normal  ScalingReplicaSet  16m   deployment-controller  Scaled up replica set kubernetes-bootcamp-5dbf48f7d4 to 1
  Normal  ScalingReplicaSet  14m   deployment-controller  Scaled up replica set kubernetes-bootcamp-5dbf48f7d4 to 4
  Normal  ScalingReplicaSet  3m    deployment-controller  Scaled down replicaset kubernetes-bootcamp-5dbf48f7d4 to 2

5 실습

testuser@localhost:~$ kubectl create deployment nginx --image=nginx
deployment.apps/nginx created
testuser@localhost:~$ kubectl expose deployment nginx --type=NodePort --port 80
service/nginx exposed
testuser@localhost:~$ kubectl get ep nginx
NAME    ENDPOINTS            AGE
nginx   192.168.235.136:80   6s
testuser@localhost:~$ kubectl scale deployment nginx --replicas=3
deployment.extensions/nginx scaled
testuser@localhost:~$ kubectl get deployments nginx 
NAME    READY   UP-TO-DATE   AVAILABLE   AGE
nginx   3/3     3            3           64s
testuser@localhost:~$ kubectl get ep nginx
NAME    ENDPOINTS                                                AGE
nginx   192.168.189.65:80,192.168.219.68:80,192.168.235.136:80   55s

6 같이 보기

• kubectl get deployments
• kubectl get pods
• kubectl describe deployments
• kubectl