在k8s上暴露EMQX(v4)的指标

1.开启prometheus 插件

部署的是 EMQX 4.4 开源版, 则需要通过 EmqxPlugin CRD 开启emqx_prometheus 插件:

cat << "EOF" | kubectl apply -f -
apiVersion: apps.emqx.io/v1beta4
kind: EmqxPlugin
metadata:
  name: emqx-prometheus
spec:
  pluginName: emqx_prometheus
  selector:
    apps.emqx.io/instance: emqx
    apps.emqx.io/managed-by: emqx-operator

获取AppID和AppSecret

curl -u {AppID}:{AppSecret} -X GET localhost:18083/api/v4/emqx_prometheus?type=prometheus

2.配置 EMQX 服务的 Kubernetes Service

确保 EMQX 的接口通过一个 Kubernetes Service 暴露。

kind: Service
apiVersion: v1
metadata:
  name: emqx-prometheus
  labels:
    app: emqx
spec:
  ports:
    - name: prometheus
      protocol: TCP
      port: 18083
      targetPort: 18083
  type: ClusterIP
  selector:
    apps.emqx.io/instance: emqx
    apps.emqx.io/managed-by: emqx-operator

3.创建 ServiceMonitor

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: emqx-monitor
spec:
  endpoints:
    - basicAuth:
        password:
          key: password
          name: emqx-basic-auth
        username:
          key: username
          name: emqx-basic-auth
      params:
        type:
          - prometheus
      path: /api/v4/emqx_prometheus
      port: prometheus
      scheme: http
  namespaceSelector:
    matchNames:
      - mes-emqx
  selector:
    matchLabels:
      app: emqx

4.创建 BasicAuth Secret

kubectl create secret generic emqx-basic-auth \
  --from-literal=username={AppID} \
  --from-literal=password={AppSecret}

5.验证Promethues 是否已经能读取到emqx的metric