Kubernetes : Horizontal Pod Autoscaler2026/05/14 |
|
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. |
|
ubuntu@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
ubuntu@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 createdubuntu@ctrl:~$ kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-88b888b9-cjl2p 1/1 Running 0 7subuntu@ctrl:~$ kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-88b888b9-cjl2p 0m 8Miubuntu@ctrl:~$ kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx cpu: 0%/20% 1 4 1 47s # run some processes to put stress in a pod manually and see current state of pods again ubuntu@ctrl:~$ kubectl get hpa NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE my-nginx-hpa Deployment/my-nginx cpu: 200%/20% 1 4 4 2m28s # pods have been scaled for settings ubuntu@ctrl:~$ kubectl get pods NAME READY STATUS RESTARTS AGE my-nginx-88b888b9-cjl2p 1/1 Running 0 2m50s my-nginx-88b888b9-k9sjp 1/1 Running 0 50s my-nginx-88b888b9-qrr69 1/1 Running 0 50s my-nginx-88b888b9-w7l4r 1/1 Running 0 50subuntu@ctrl:~$ kubectl top pod NAME CPU(cores) MEMORY(bytes) my-nginx-88b888b9-cjl2p 1m 9Mi my-nginx-88b888b9-k9sjp 0m 8Mi my-nginx-88b888b9-qrr69 0m 7Mi my-nginx-88b888b9-w7l4r 0m 7Mi |
| Sponsored Link |
|
|