Sample Nginx Ingress Controller Integrate With Prometheus Grafana in OKE (Oracle Kubernetes Engine)

Requirement:

Ingress is proved to be very useful and efficient in Kubernetes world. The concept of ingress can be found official Kubernetes doc.  Ingress is similar to bigip on-premise. It provides rich functions for how to route and control ingress traffic in OKE. It is also adopted by the OKE team.

This note is based on https://kubernetes.github.io/ingress-nginx/   version 0.26

Kubernetes version needs to be at least v1.14.0

You would need cluster-admin role to proceed

Installation Steps:

• git clone https://github.com/HenryXie1/Prometheus-Granafa-Ingress-OKE.git
• cd  Prometheus-Granafa-Ingress-OKE/ingress-controllers/nginx
• kubectl create -f ingress-controller.yaml
• It will create internal Loadbalancer in OKE
• typical output is

  • kubectl get po -n ingress-nginx
    NAME                                       READY   STATUS    RESTARTS   AGE
    nginx-ingress-controller-d7976cdbd-d2zr6   1/1     Running   0          71m

    kubectl get svc -n ingress-nginx
    NAME            TYPE           CLUSTER-IP     EXTERNAL-IP       PORT(S)                      AGE
    ingress-nginx   LoadBalancer   10.96.197.52   123.123.123.123   80:32155/TCP,443:31641/TCP   70m

Access Prometheus via Ingress Controller:

• About how to install Prometheus, please refer Install Prometheus and Grafana with High Availability in OKE (Oracle Kubernetes Engine)
• Steps of accessing Prometheus via ingress controller
  • Spoof IP address for DNS names via below entry and take off www proxy of the browser
    • 123.123.123.123         prometheus.bar.com  grafana.bar.com  alertmanager.bar.com
  • prometheus.bar.com
    • 
  • grafana.bar.com  
    • 
  • alertmanager.bar.com
    • 
• Ingress for Grafana

  • apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: grafana-ingress
      annotations:
        kubernetes.io/ingress.class: "nginx"
    spec:
      rules:
      - host: grafana.bar.com
        http:
          paths:
          - path: /
            backend:
              serviceName: grafana
              servicePort: 3000

• Ingress for Alert manager

  • apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: alertmanager-ingress
      annotations:
        kubernetes.io/ingress.class: "nginx"
    spec:
      rules:
      - host: alertmanager.bar.com
        http:
          paths:
          - path: /
            backend:
              serviceName: alertmanager-main
              servicePort: 9093

• Ingress for Prometheus

  • apiVersion: extensions/v1beta1
    kind: Ingress
    metadata:
      name: prometheus-ingress
      annotations:
        kubernetes.io/ingress.class: "nginx"
    spec:
      rules:
      - host: prometheus.bar.com
        http:
          paths:
          - path: /
            backend:
              serviceName: prometheus-k8s
              servicePort: 9090

  •