1.暴露pods给Prometheus抓取

spec:
  replicas: __app_replicas__
  template:
    metadata:
      annotations:
        prometheus.io/scrape: 'true'
        prometheus.io/path: '/metrics'
        prometheus.io/port: '9146'

2.部署Prometheus

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: prometheus
rules:
- apiGroups: [""]
  resources:
  - nodes
  - nodes/proxy
  - services
  - endpoints
  - pods
  verbs: ["get", "list", "watch"]
- apiGroups:
  - extensions
  resources:
  - ingresses
  verbs: ["get", "list", "watch"]
- nonResourceURLs: ["/metrics"]
  verbs: ["get"]
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: prometheus
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: prometheus
subjects:
- kind: ServiceAccount
  name: default
  namespace: default
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: prometheus
  labels:
    app: prometheus
spec:
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: prometheus
    spec:
      serviceAccountName: default
      containers:
      - name: prometheus
        image: image.url
        command:
        - "/bin/prometheus"
        ports:
        - containerPort: 9090
        args:
        - "--config.file=/etc/prometheus/prometheus.yml"
        - "--storage.tsdb.path=/prometheus"
        - "--storage.tsdb.retention.time=24h"
        volumeMounts:
        - mountPath: /etc/prometheus/
          name: config-volume
      restartPolicy: Always
      volumes:
      - name: config-volume
        configMap:
          name: prometheus-configuration
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: prometheus-configuration
data:
  prometheus.yml: |-
    global:
      scrape_interval:     5s
      external_labels:
        monitor: 'my-monitor'
    scrape_configs:
    - job_name: 'kubernetes-pods'
      kubernetes_sd_configs:
      - role: pod
      relabel_configs:
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
        action: keep
        regex: true
      - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
        action: replace
        target_label: __metrics_path__
        regex: (.+)
      - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
        action: replace
        regex: ([^:]+)(?::\d+)?;(\d+)
        replacement: $1:$2
        target_label: __address__
      - action: labelmap
        regex: __meta_kubernetes_pod_label_(.+)
      - source_labels: [__meta_kubernetes_pod_name]
        action: replace
        target_label: pod_name
      - regex: '(controller_revision_hash|job)'
        action: labeldrop
      - source_labels: [name]
        regex: '.*/(.*)$'
        replacement: $1
        target_label: webapp
---
apiVersion: v1
kind: Service
metadata:
  name: prometheus
spec:
  type: NodePort
  ports:
  - port: 9090
    targetPort: 9090
    nodePort: 31090
  selector:
    app: prometheus