K8s Prometheus CoreOS Operator - Adding external nodes to be monitored.

gistfile1.txt

-- My need was to include nodes outside of my k8s cluster for monitoring.
-- Thanks to @amalucelli for originally posting this.
-- https://github.com/coreos/prometheus-operator/issues/834
--
-- This is tested with k8s 1.9, and .17 prometheus operator, using the pre-built deployment at
-- https://github.com/coreos/prometheus-operator/blob/master/contrib/kube-prometheus/README.md
-- Steps: Deploy per the script above, and then apply these objects. Should appear in granfa after a short time.

kind: Service
apiVersion: v1
metadata:
  name: my-internal-server
  labels:
    k8s-app: node-exporter
spec:
  type: ExternalName
  externalName: 172.20.58.243
  ports:
  - name: metrics
    port: 9100
    protocol: TCP
    targetPort: 9100

apiVersion: v1
kind: Endpoints
metadata:
  name: my-internal-server
  labels:
    k8s-app: node-exporter
subsets:
- addresses:
  - ip: 172.20.58.243
  ports:
  - name: metrics
    port: 9100
    protocol: TCP

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: internal-servers
  labels:
    k8s-app: node-exporter
spec:
  selector:
    matchLabels:
      k8s-app: node-exporter
  namespaceSelector:
    matchNames:
    - monitoring
  endpoints:
  - port: metrics
    interval: 10s
    honorLabels: true
    path: /metrics