Prometheus Pushgateway的安装使用

一 PushGateway说明

Prometheus Pushgateway 是为了允许临时和批处理作业向 Prometheus 公开其指标。由于这些类型的作业可能存在的时间不够长而无法被抓取，因此他们可以将指标推送到 Pushgateway。然后 Pushgateway 将这些指标公开给 Prometheus。
pushgateway的GitHub地址：https://github.com/prometheus/pushgateway

二 在K8S中安装Pushgateway

通过以下yaml文件安装，kubectl apply -f pushgateway-deployment.yaml
pushgateway-deployment.yaml

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  labels:
    name: pushgateway-deployment
  name: pushgateway
  namespace: kube-system
spec:
  replicas: 1
  selector:
    matchLabels:
      app: pushgateway
  template:
    metadata:
      labels:
        app: pushgateway
    spec:
      nodeSelector: 
        zone: system
      containers:
      - image: prom/pushgateway:v1.4.2
        name: pushgateway
        livenessProbe:
          failureThreshold: 1
          httpGet:
            path: /-/healthy
            port: 9091
            scheme: HTTP
          initialDelaySeconds: 3
          periodSeconds: 30
          successThreshold: 1
          timeoutSeconds: 9
        readinessProbe:
          failureThreshold: 1
          httpGet:
            path: /-/ready
            port: 9091
            scheme: HTTP
          initialDelaySeconds: 3
          periodSeconds: 15
          successThreshold: 1
          timeoutSeconds: 9
        ports:
        - containerPort: 9091
          protocol: TCP
        resources:
          requests:
            cpu: 10m
            memory: 100Mi
          limits:
            cpu: 100m
            memory: 2000Mi
---
kind: Service
apiVersion: v1
metadata:
  labels:
    app: pushgateway
  name: pushgateway
  namespace: kube-system
spec:
  ports:
  - port: 9091
    targetPort: 9091
  selector:
    app: pushgateway

在 Prometheus 中的configmap中添加配置如下：

- job_name: pushgateway
  honor_labels: true
  static_configs:
  - targets: ['pushgateway:9091']
    labels:
      instance: pushgateway
      service: pushgatewayservice

再通过命令 curl -XPOST http://[prometheus-host]:9090/-/reload 刷新Prometheus配置。