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Using hostPath Volume Type to Inject Configuration Files

Using hostPath Volume Type to Inject Configuration Files

In this lesson, we will get familiarized with Prometheus and configure it with hostPath Volume.

Using Prometheus

We are about to deploy Prometheus for the first time. We won’t go into details behind the application except to say that it’s fantastic and that you should consider it for your monitoring and alerting needs. We’re using it only to demonstrate a few Kubernetes concepts. We’re not trying to learn how to operate it.

Looking into the Definition

Let’s take a look at the application’s definition.

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cat volume/prometheus.yml

The output is as follows.

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apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: prometheus
  annotations:
    ingress.kubernetes.io/ssl-redirect: "false"
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
spec:
  rules:
  - http:
      paths:
      - path: /prometheus
        backend:
          serviceName: prometheus
          servicePort: 9090
---
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: prometheus
spec:
  selector:
    matchLabels:
      type: monitor
      service: prometheus
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        type: monitor
        service: prometheus
    spec:
      containers:
      - name: prometheus
        image: prom/prometheus:v2.0.0
        command:
        - /bin/prometheus
        args:
        - "--config.file=/etc/prometheus/prometheus.yml"
        - "--storage.tsdb.path=/prometheus"
        - "--web.console.libraries=/usr/share"
        - "--web.external-url=http://192.168.99.100/prometheus"
---
apiVersion: v1
kind: Service
metadata:
  name: prometheus
spec:
  ports:
  - port: 9090
  selector:
    type: monitor
    service: prometheus

There’s nothing genuinely new in that YAML file. It defines an Ingress, a Deployment, and a Service. There is, however, one thing we might need to change.

Configuring the IP

Prometheus needs a full external-url if we want to change the base path. At the moment, it’s set to the IP of our Minikube VM. In your case, that IP might be different. We’ll fix that ...

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