Kubernetes : Horizontal Pod Autoscaler2023/07/28 |
Configure Horizontal Pod Autoscaler to set auto scaling to Pods. This example is based on the environment like follows. -----------+---------------------------+--------------------------+------------ | | | eth0|10.0.0.25 eth0|10.0.0.71 eth0|10.0.0.72 +----------+-----------+ +-----------+-----------+ +-----------+-----------+ | [ ctrl.srv.world ] | | [snode01.srv.world] | | [snode02.srv.world] | | Control Plane | | Worker Node | | Worker Node | +----------------------+ +-----------------------+ +-----------------------+ |
[1] | |
[2] | This is an example of Deployment to set Horizontal Pod Autoscaler. |
root@ctrl:~#
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@ctrl:~#
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 # verify settings root@ctrl:~# kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-55f9ff4dc6-sfmtq 1/1 Running 0 7sroot@ctrl:~# kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-55f9ff4dc6-sfmtq 0m 7Mi # after creating, [TARGETS] value is [unknown] root@ctrl:~# 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@ctrl:~# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx 0%/20% 1 4 1 58s # run some processes in a pod manually and see current state of pods again root@ctrl:~# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx 50%/20% 1 4 4 3m52s # pods have been scaled for settings root@ctrl:~# kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-55f9ff4dc6-7zp5n 1/1 Running 0 57s my-nginx-55f9ff4dc6-842tc 1/1 Running 0 57s my-nginx-55f9ff4dc6-9w2tt 1/1 Running 0 57s my-nginx-55f9ff4dc6-sfmtq 1/1 Running 0 3m57sroot@ctrl:~# kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-55f9ff4dc6-7zp5n 0m 7Mi my-nginx-55f9ff4dc6-842tc 0m 4Mi my-nginx-55f9ff4dc6-9w2tt 0m 4Mi my-nginx-55f9ff4dc6-sfmtq 59m 7Mi |
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