MicroK8s : Horizontal Pod Autoscaler2023/06/22 |
Configure Horizontal Pod Autoscaler to set auto scaling to Pods.
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[1] | |
[2] | This is an example of Deployment to set Horizontal Pod Autoscaler. |
root@dlp:~#
vi my-nginx.yml apiVersion: apps/v1 kind: Deployment metadata: labels: run: my-nginx name: my-nginx spec: replicas: 1 selector: matchLabels: run: my-nginx template: metadata: labels: run: my-nginx spec: containers: - image: nginx name: my-nginx resources: # requests : set minimum required resources when creating pods requests: # 250m : 0.25 CPU cpu: 250m memory: 64Mi # set maximum resorces limits: cpu: 500m memory: 128Mi
root@dlp:~#
vi hpa.yml apiVersion: autoscaling/v2 kind: HorizontalPodAutoscaler metadata: name: my-nginx-hpa namespace: default spec: scaleTargetRef: apiVersion: apps/v1 kind: Deployment # target Deployment name name: my-nginx minReplicas: 1 # maximum number of replicas maxReplicas: 4 metrics: - type: Resource resource: # scale if target CPU utilization is over 20% name: cpu target: type: Utilization averageUtilization: 20 microk8s kubectl apply -f my-nginx.yml -f hpa.yml deployment.apps/my-nginx created horizontalpodautoscaler.autoscaling/my-nginx-hpa created # verify settings root@dlp:~# microk8s kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-65d9d7d54-r6kkx 1/1 Running 0 8sroot@dlp:~# microk8s kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-65d9d7d54-r6kkx 0m 7Mi # after creating, [TARGETS] value is [unknown] root@dlp:~# microk8s kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx <unknown>/20% 1 4 1 32s # if some processes run in a pod, [TARGETS] value are gotten root@dlp:~# microk8s kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx 0%/20% 1 4 1 68s # run some processes in a pod manually and see current state of pods again root@dlp:~# microk8s kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx 108%/20% 1 4 1 12m # pods have been scaled for settings root@dlp:~# microk8s kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-65d9d7d54-r6kkx 1/1 Running 0 12m my-nginx-65d9d7d54-sqvd2 1/1 Running 0 17s my-nginx-65d9d7d54-rh25s 1/1 Running 0 17s my-nginx-65d9d7d54-6j8tv 1/1 Running 0 17sroot@dlp:~# microk8s kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-65d9d7d54-6j8tv 0m 7Mi my-nginx-65d9d7d54-r6kkx 0m 7Mi my-nginx-65d9d7d54-rh25s 0m 7Mi my-nginx-65d9d7d54-sqvd2 0m 7Mi |
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