Kubernetes : Horizontal Pod Autoscaler2025/05/20 |
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Configure Horizontal Pod Autoscaler to set auto scaling to Pods. This example is based on the environment like follows.
+----------------------+ +----------------------+
| [ ctrl.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. |
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[cent@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
[cent@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[cent@ctrl ~]$ kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-5496ddfbbb-z2zbl 1/1 Running 0 8s[cent@ctrl ~]$ kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-5496ddfbbb-z2zbl 0m 7Mi[cent@ctrl ~]$ kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx cpu: 0%/20% 1 4 1 70s # run some processes to put stress in a pod manually and see current state of pods again [cent@ctrl ~]$ kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx cpu: 200%/20% 1 4 4 2m32s # pods have been scaled for settings [cent@ctrl ~]$ kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-5496ddfbbb-886zt 1/1 Running 0 31s my-nginx-5496ddfbbb-gt489 1/1 Running 0 31s my-nginx-5496ddfbbb-p7zcn 1/1 Running 0 31s my-nginx-5496ddfbbb-z2zbl 1/1 Running 0 2m46s[cent@ctrl ~]$ kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-5496ddfbbb-886zt 0m 7Mi my-nginx-5496ddfbbb-gt489 0m 7Mi my-nginx-5496ddfbbb-p7zcn 0m 7Mi my-nginx-5496ddfbbb-z2zbl 0m 8Mi |
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