kubez-autoscaler 通过为 deployment / statefulset 添加 annotations 的方式，自动维护对应 HorizontalPodAutoscaler 的生命周期.
在 kubernetes 集群中， 需要先完成 Metrics Server 组件的安装，请参考 Metrics Server
kubectl top node/pod 验证 Metrics Server 已成功安装
# kubectl top node
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
kubez 333m 16% 1225Mi 65%
# kubectl top pod
NAME CPU(cores) MEMORY(bytes)
test1-54cd855b77-q67h6 1m 3Mikubez-autoscaler 控制器的安装非常简单，通过 kubectl 执行 apply 如下文件即可完成安装，真正做到猩猩都能使用.
apiVersion: v1
kind: ServiceAccount
metadata:
name: kubez
namespace: default
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: kubez
rules:
- apiGroups:
- "*"
resources:
- horizontalpodautoscalers
- deployments
- statefulsets
- endpoints
- leases
verbs:
- get
- list
- watch
- create
- delete
- update
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kubez
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: kubez
subjects:
- kind: ServiceAccount
name: kubez
namespace: default
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
kubez.hpa.controller: kubez-autoscaler
name: kubez-autoscaler-controller
namespace: default
spec:
replicas: 2
selector:
matchLabels:
kubez.hpa.controller: kubez-autoscaler
template:
metadata:
labels:
kubez.hpa.controller: kubez-autoscaler
spec:
containers:
- image: jacky06/kubez-autoscaler-controller:v0.0.1
command:
- kubez-autoscaler-controller
- --leader-elect=true
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 8
httpGet:
host: 127.0.0.1
path: /healthz
port: 10256
scheme: HTTP
initialDelaySeconds: 15
periodSeconds: 10
successThreshold: 1
timeoutSeconds: 15
resources:
requests:
cpu: 100m
memory: 90Mi
name: kubez-autoscaler-controller
serviceAccountName: kubez然后通过 kubectl get pod -l kubez.hpa.controller=kubez-autoscaler 能看到 kubez-autoscaler 已经启动成功.
NAME READY STATUS RESTARTS AGE
kubez-autoscaler-controller-dbc4bc4d8-hwpqz 1/1 Running 0 20s
kubez-autoscaler-controller-dbc4bc4d8-tqxrl 1/1 Running 0 20s在 deployment / statefulset 的 annotations 中添加所需注释即可自动创建对应的 HPA
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
...
hpa.caoyingjunz.io/minReplicas: "2" # MINPODS
hpa.caoyingjunz.io/maxReplicas: "6" # MAXPODS
cpu.hpa.caoyingjunz.io/targetAverageUtilization: "60" # TARGETS
...
name: test1
namespace: default
...kubez-autoscaler-controller 会根据注释的变化，自动同步 HPA 的生命周期.
通过 kubectl get hpa test1 命令，可以看到 deployment / statefulset 关联的 HPA 被自动创建
NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE
test1 Deployment/test1 6% / 60% 1 2 1 5h29m
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