Prometheus监控AirNet服务器（node_exporter）

摘要：

node-exporter；Endpoint；

1、AirNet物理主机安装node-exporter服务；

[Unit]
Description=node_exporter
Documentation=https://github.com/prometheus/node_exporter
After=network.target
[Service]
Type=simple
User=root
ExecStart=/usr/local/node_exporter  --collector.ntp  --collector.mountstats --collector.systemd  --collector.perf --collector.tcpstat
ExecReload=/bin/kill -HUP $MAINPID
TimeoutStopSec=20s
Restart=always
[Install]
WantedBy=multi-user.target

配置ServiceMonitor，通过Labels选择无头Service，没有selector的service不会出现Endpoint的信息，需要手工创建Endpoint绑定，Endpoint可以是内部的pod，下面是外部的服务，这里指定到要监控的AirNet物理主机的IP，一个Endpoints切片方式配置可以绑定多台物理服务器的IP。

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: airnet-node-exporter
  namespace: monitoring
  labels:
    airnet: airnet-node-exporter
    namespace: monitoring
spec:
  jobLabel: airnet-app
  endpoints:
  - interval: 30s
    port: api
    scheme: http    
  namespaceSelector:
    matchNames:
    - monitoring
  selector:
    matchLabels:
      airnet: airnet-node-exporter
---
apiVersion: v1
kind: Service
metadata:
  labels:
    airnet: airnet-node-exporter
  name: airnet
  namespace: monitoring
spec:
  clusterIP: None
  clusterIPs:
  - None
  ports:
  - name: api
    port: 9100
    protocol: TCP
    targetPort: api
  type: ClusterIP 
---
kind: Endpoints
apiVersion: v1
metadata:
  name: airnet
  namespace: monitoring  
subsets:
  - addresses:
      - ip: 192.168.31.158
        nodeName: airnet-fdp1   
    ports:
      - port: 9100
        name: api
        protocol: TCP
  - addresses:
      - ip: 192.168.31.184
        nodeName: airnet-acc-fdo1       
    ports:
      - port: 9100
        name: api
        protocol: TCP