add HPA setting
Jimmy Song
parent
920927a0f6
commit
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@ -1,11 +1,15 @@
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# 自定义指标HPA
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Kubernetes中支持不仅支持CPU、内存为指标的HPA，还支持自定义指标的HPA，例如QPS。
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Kubernetes中不仅支持CPU、内存为指标的HPA，还支持自定义指标的HPA，例如QPS。
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本文中使用的yaml文件见[manifests/HPA](https://github.com/rootsongjc/kubernetes-handbook/tree/master/manifests/HPA)。
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## 设置自定义指标
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**kubernetes1.6**
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> 在kubernetes1.6集群中配置自定义指标的HPA的说明已废弃。
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在设置定义指标HPA之前需要先进行如下配置：
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- 将heapster的启动参数 `--api-server` 设置为 true
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@ -16,17 +20,22 @@ Kubernetes中支持不仅支持CPU、内存为指标的HPA，还支持自定义
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在kubernetes1.5以前很容易设置，参考[1.6以前版本的kubernetes中开启自定义HPA](https://medium.com/@marko.luksa/kubernetes-autoscaling-based-on-custom-metrics-without-using-a-host-port-b783ed6241ac)，而在1.6中因为取消了原来的annotation方式设置custom metric，只能通过API server和kube-aggregator来获取custom metric，因为只有两种方式来设置了，一是直接通过API server获取heapster的metrics，二是部署[kube-aggragator](https://github.com/kubernetes/kube-aggregator)来实现。
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我们将安装聚合的API server来实现自定义指标的HPA。
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我们将在kubernetes1.8版本的kubernetes中，使用聚合的API server来实现自定义指标的HPA。
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**kuberentes1.7**
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**kuberentes1.7+**
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确认您的kubernetes版本在1.7或以上，修改以下配置：
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- 将kube-controller-manager的启动参数中`--horizontal-pod-autoscaler-use-rest-clients`设置为true，并指定`--master`为API server地址，如`--master=http://172.20.0.113:8080
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- 修改kube-apiserver的配置文件apiserver，增加一条配置`--requestheader-client-ca-file=/etc/kubernetes/ssl/ca.pem --requestheader-allowed-names=aggregator --requestheader-extra-headers-prefix=X-Remote-Extra- --requestheader-group-headers=X-Remote-Group --requestheader-username-headers=X-Remote-User --proxy-client-cert-file=/etc/kubernetes/ssl/kubernetes.pem --proxy-client-key-file=/etc/kubernetes/ssl/kubernetes-key.pem`，用来配置aggregator的CA证书。
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已经内置了`apiregistration.k8s.io/v1beta1` API，可以直接定义APIService，如：
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```yaml
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apiVersion: apiregistration.k8s.io/v1beta1
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apiVersion: apiregistration.k8s.io/v1
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kind: APIService
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metadata:
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name: v1alpha1.custom-metrics.metrics.k8s.io
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name: v1.custom-metrics.metrics.k8s.io
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spec:
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insecureSkipTLSVerify: true
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group: custom-metrics.metrics.k8s.io
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@ -38,8 +47,129 @@ spec:
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version: v1alpha1
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```
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**部署Prometheus**
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使用下面的yaml文件部署Prometheus operator：
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```yaml
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apiVersion: rbac.authorization.k8s.io/v1beta1
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kind: ClusterRoleBinding
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metadata:
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name: prometheus-operator
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: prometheus-operator
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subjects:
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- kind: ServiceAccount
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name: prometheus-operator
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namespace: default
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---
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apiVersion: rbac.authorization.k8s.io/v1beta1
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kind: ClusterRole
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metadata:
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name: prometheus-operator
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rules:
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- apiGroups:
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- extensions
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resources:
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- thirdpartyresources
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verbs:
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- "*"
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- apiGroups:
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- apiextensions.k8s.io
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resources:
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- customresourcedefinitions
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verbs:
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- "*"
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- apiGroups:
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- monitoring.coreos.com
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resources:
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- alertmanagers
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- prometheuses
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- servicemonitors
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verbs:
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- "*"
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- apiGroups:
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- apps
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resources:
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- statefulsets
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verbs: ["*"]
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- apiGroups: [""]
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resources:
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- configmaps
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- secrets
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verbs: ["*"]
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- apiGroups: [""]
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resources:
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- pods
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verbs: ["list", "delete"]
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- apiGroups: [""]
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resources:
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- services
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- endpoints
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verbs: ["get", "create", "update"]
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- apiGroups: [""]
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resources:
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- nodes
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verbs: ["list", "watch"]
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- apiGroups: [""]
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resources:
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- namespaces
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verbs: ["list"]
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---
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: prometheus-operator
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---
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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labels:
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k8s-app: prometheus-operator
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name: prometheus-operator
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spec:
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replicas: 1
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template:
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metadata:
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labels:
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k8s-app: prometheus-operator
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spec:
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containers:
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- args:
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- --kubelet-service=kube-system/kubelet
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- --config-reloader-image=sz-pg-oam-docker-hub-001.tendcloud.com/library/configmap-reload:v0.0.1
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image: sz-pg-oam-docker-hub-001.tendcloud.com/library/prometheus-operator:v0.15.0
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name: prometheus-operator
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ports:
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- containerPort: 8080
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name: http
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resources:
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limits:
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cpu: 200m
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memory: 100Mi
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requests:
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cpu: 100m
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memory: 50Mi
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serviceAccountName: prometheus-operator
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```
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**注意：**将镜像修改为你自己的镜像仓库地址。
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这产生一个自定义的API：http://172.20.0.113:8080/apis/custom-metrics.metrics.k8s.io/v1alpha1
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TODO
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## 参考
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[1.6以前版本的kubernetes中开启自定义HPA](https://medium.com/@marko.luksa/kubernetes-autoscaling-based-on-custom-metrics-without-using-a-host-port-b783ed6241ac)
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[1.7版本的kubernetes中启用自定义HPA](https://docs.bitnami.com/kubernetes/how-to/configure-autoscaling-custom-metrics/)
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[1.7版本的kubernetes中启用自定义HPA](https://docs.bitnami.com/kubernetes/how-to/configure-autoscaling-custom-metrics/)
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[Horizontal Pod Autoscaler Walkthrough](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale-walkthrough/)
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[Kubernetes 1.8: Now with 100% Daily Value of Custom Metrics](https://blog.openshift.com/kubernetes-1-8-now-custom-metrics/)
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[Arbitrary/Custom Metrics in the Horizontal Pod Autoscaler#117](https://github.com/kubernetes/features/issues/117)
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