Kubernetes : Horizontal Pod Autoscaler2020/08/19 |
Configure Horizontal Pod Autoscaler to set auto scaling to Pods.
This example is based on the environment like follows.
-----------+---------------------------+--------------------------+------------ | | | eth0|10.0.0.30 eth0|10.0.0.51 eth0|10.0.0.52 +----------+-----------+ +-----------+----------+ +-----------+----------+ | [ dlp.srv.world ] | | [ node01.srv.world ] | | [ node02.srv.world ] | | Master Node | | Worker Node | | Worker Node | +----------------------+ +----------------------+ +----------------------+ |
[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/v2beta1 kind: HorizontalPodAutoscaler metadata: name: my-nginx-hpa namespace: default spec: scaleTargetRef: kind: Deployment apiVersion: apps/v1 # target Deployment name name: my-nginx # maximum number of replicas maxReplicas: 4 minReplicas: 1 metrics: - type: Resource resource: # scale if target CPU utilization is over 20% name: cpu targetAverageUtilization: 20 kubectl apply -f my-nginx.yml -f hpa.yml deployment.apps/my-nginx created horizontalpodautoscaler.autoscaling/my-nginx-hpa created # verify settings root@dlp:~# kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-fdd659f4b-fwzj9 1/1 Running 0 71sroot@dlp:~# kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-fdd659f4b-fwzj9 2m 3Mi # after creating, [TARGETS] value is [unknown] root@dlp:~# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx <unknown>/20% 1 4 1 87s # if some processes run in a pod, [TARGETS] value are gotten root@dlp:~# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx 0%/20% 1 4 1 2m23s # run some processes in a pod manually and see current state of pods again root@dlp:~# kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx 200%/20% 1 4 4 5m29s # pods have been scaled for settings root@dlp:~# kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-fdd659f4b-99dtf 1/1 Running 0 50s my-nginx-fdd659f4b-ffsz4 1/1 Running 0 50s my-nginx-fdd659f4b-fwzj9 1/1 Running 0 5m23s my-nginx-fdd659f4b-gnpm7 1/1 Running 0 50sroot@dlp:~# kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-fdd659f4b-99dtf 0m 3Mi my-nginx-fdd659f4b-ffsz4 0m 3Mi my-nginx-fdd659f4b-fwzj9 501m 5Mi my-nginx-fdd659f4b-gnpm7 0m 3Mi |
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