【Prometheus】k8s集群部署prometheus监控

 一、为什么使用prometheus监控k8s集群

• 与k8s高度集成：与k8s的组件高度集成，以获取有关Pod、容器和服务的指标数据
• 方便查询数据：支持PromQL，一种多维的灵活查询语言，查询数据更方便简洁
• 使用“拉”模型：通过HTTP上的拉取时间序列收集数据，相比“推”模型降低压力
• 可扩展性强：Prometheus具有水平扩展的能力，可以通过添加更多的实例来处理大规模的监控数据，这使得它非常适合用于监控大型K8s集群

 二、部署prometheus

版本信息：
prometheus版本：3.1.0

node-exporter版本：1.8.2

kubernetes版本：1.28.14

 拉取prometheus docker镜像 

docker pull prom/prometheus

 推送镜像到harbor仓库中

docker tag prom/prometheus:latest harbor.com/k8s_repository/prometheus:3.1.0

docker push harbor.com/k8s_repository/prometheus:3.1.0

 编写prometheus部署的yaml，创建prometheus所需的ServiceAccount、ClusterRolebinding、Service、Ingress、Deployment、Configmap

#创建SA
apiVersion: v1
kind: ServiceAccount
metadata:
  name: prometheus
  namespace: monitor

---
#创建clusterrole
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: prometheus
rules:
- apiGroups:
  - ""
  resources:
  - nodes
  - services
  - endpoints
  - pods
  - nodes/proxy
  - nodes/proxy
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - "extenstions"
  resources:
    - ingresses
  verbs:
  - get
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - configmaps
  - nodes/metrics
  verbs:
  - get
- nonResourceURLs:
  - /metrics
  verbs:
  - get

---
#创建clusterrolebinding
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: prometheus
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: prometheus
subjects:
- kind: ServiceAccount
  name: prometheus
  namespace: monitor

---
#创建svc
apiVersion: v1
kind: Service
metadata:
  name: prometheus-svc
  namespace: monitor
  labels:
    app: prometheus
spec:
  selector:
    app: prometheus
  type: NodePort
  ports:
    - name: web
      nodePort: 32224
      port: 9090
      targetPort: http

---
#创建ingress
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: prometheus-ingress
  namespace: monitor
spec:
  ingressClassName: nginx
  rules:
  - host: www.myprometheus.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name:  prometheus-svc
            port:
              number: 9090
---
#创建deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: prometheus
  namespace: monitor
  labels:
    app: prometheus
spec:
  selector:
    matchLabels: