prometheus-fake-exporter's Introduction

Prometheus fake exporter

How to run it

This project was created just to test K8S Horizontal Pod Autoscaler. It exports fake_metric with a value fetched from http_endpoint.

Arguments required:

namespace
name of the additional label
value of the additional label
http endpoint serving float value like github raw gist

HPA (Horizontal Pod Autoscaler) on Kubernetes

Below you will find code snippet with prometheus-fake-exporter deployment and HPA associated with that deployment scaling based on Object Deployment metric. By replacing a value in github gist you can change HPA behaviour and see how it works for yourself.

---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: prometheus-fake-exporter
spec:
  replicas: 1
  template:
    metadata:
      annotations:
        # Automatic prometheus scraping
        prometheus.io/port: '9100'
        prometheus.io/scrape: 'true'
        scope: cluster
      labels:
        app: prometheus-fake-exporter
    spec:
      automountServiceAccountToken: false
      containers:
      - image: 3h4x/prometheus-fake-exporter:latest
        name: prometheus-fake-exporter
        ports:
        - containerPort: 9100
        env:
        - name: LABEL_NAME
          value: deployment
        - name: LABEL_VALUE
          value: prometheus-fake-exporter
        - name: VALUE_HTTP_ENDPOINT
          value: https://gist.githubusercontent.com/3h4x/38ba057db9cbb80c7bf8ad768a90d086/raw/value
        - name: POD_NAMESPACE
          valueFrom:	
            fieldRef:	
              fieldPath: metadata.namespace
---
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: prometheus-fake-exporter
spec:
  maxReplicas: 40
  minReplicas: 10
  scaleTargetRef:
    apiVersion: extensions/v1beta1
    kind: Deployment
    name: prometheus-fake-exporter
  metrics:
  - type: Object
    object:
      metricName: fake_metric
      target:
        kind: Deployment
        name: prometheus-fake-exporter
      targetValue: 10

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