k8s HPA自动收缩

HPA自动收缩
autoscale      自动调整一个 Deployment, ReplicaSet, 或者 ReplicationController 的副本数量

#创建一个replicaset测试
[root@k8s-m ~]# cat    my-replicaset.yaml
apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: myreplicaset
  namespace: default
spec:
  replicas: 2
  selector:
    matchLabels:
      test_node: k8s-node1
  template:
    metadata:
      name: my-replicaset-pod
      labels:
        test_node: k8s-node1
    spec:
      containers:
      - name: my-rep
        image: nginx
        ports:
        - name: http
          containerPort: 80
        resources:
          requests:
            cpu: "100m"
            memory: "64Mi"
          limits:
            memory: "64Mi"
            cpu: "100m"  

#导入
 kubectl apply -f    my-replicaset.yaml
 #查看
[root@k8s-m ~]# kubectl  get pod
NAME                     READY     STATUS    RESTARTS   AGE
myreplicaset-8prkv       1/1       Running   0          55s
myreplicaset-8sbgs       1/1       Running   0          55s

#设置自动伸缩
#设置myreplicaset 最少1个，最多10个，cpu资源最多使用40%
kubectl  autoscale   replicaset myreplicaset  --min=1  --max=10 --cpu-percent=40

#查看hpa
[root@k8s-m ~]# kubectl  get hpa
NAME           REFERENCE                 TARGETS         MINPODS   MAXPODS   REPLICAS   AGE
myreplicaset   ReplicaSet/myreplicaset   <unknown>/40%   1         10        0          29s