Kubernetes : Horizontal Pod Autoscaler2023/10/20 |
Configure Horizontal Pod Autoscaler to set auto scaling to Pods. This example is based on the environment like follows. +----------------------+ +----------------------+ | [ mgr.srv.world ] | | [ dlp.srv.world ] | | Manager Node | | Control Plane | +-----------+----------+ +-----------+----------+ eth0|10.0.0.25 eth0|10.0.0.30 | | ------------+--------------------------+----------- | | eth0|10.0.0.51 eth0|10.0.0.52 +-----------+----------+ +-----------+----------+ | [ node01.srv.world ] | | [ node02.srv.world ] | | Worker Node#1 | | Worker Node#2 | +----------------------+ +----------------------+ |
[1] | |
[2] | This is an example of Deployment to set Horizontal Pod Autoscaler. |
[root@mgr ~]#
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@mgr ~]#
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 kubectl apply -f my-nginx.yml -f hpa.yml deployment.apps/my-nginx created horizontalpodautoscaler.autoscaling/my-nginx-hpa created[root@mgr ~]# kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-566ff895cb-ksfjm 1/1 Running 0 9s[root@mgr ~]# kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-566ff895cb-ksfjm 0m 7Mi[root@mgr ~]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx 0%/20% 1 4 1 69s # run some processes to put stress in a pod manually and see current state of pods again [root@mgr ~]# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx 50%/20% 1 4 4 5m2s # pods have been scaled for settings [root@mgr ~]# kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-566ff895cb-62s6p 1/1 Running 0 100s my-nginx-566ff895cb-6q6z7 1/1 Running 0 100s my-nginx-566ff895cb-ksfjm 1/1 Running 0 5m40s my-nginx-566ff895cb-xptl9 1/1 Running 0 100s[root@mgr ~]# kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-566ff895cb-62s6p 0m 4Mi my-nginx-566ff895cb-6q6z7 0m 4Mi my-nginx-566ff895cb-ksfjm 0m 8Mi my-nginx-566ff895cb-xptl9 0m 7Mi |
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