Kubernetes Nginx-ingress controller with HAProxy on Bare Metal

Kubernetes works like a wonder in cloud environments like AWS, Azure, or GCE. Many times we do not have a luxury of the above cloud environments.

This article helps you to set up an ingress-controller with Nginx as a load balancer in a bare-metal machine.


Pre-requisites

  • 3 virtual machines
  • Git installed
  • Centos 7 or any Linux distro

Setting up HA Proxy Centos 7

HAProxy is free, open-source software that provides a high availability load balancer and proxy server for TCP and HTTP-based applications that spreads requests across multiple servers


  • Create a virtual machine named HAProxy.
  •  Install haproxy using the yum package
     yum install haproxy -y
  • Edit the ha config file and add the following like this
    vi /etc/haproxy/haproxy.cfg
  • Delete all the section below the defaults section and add the following at last
    frontend http_front
    bind *:80
    bind :8080
    stats uri /haproxy?stats
    default_backend http_back
    backend http_back
    balance round-robin
    server kube 10.10.10.10:80
    server kube1 10.10.10.11:80
  • Enable and Restart the haproxy service
    systemctl restart haproxy
  • Check the status whether it is running fine
    systemctl status haproxy

Setting up Ingress controller


  • Clone the repo https://github.com/nginxinc/kubernetes-ingress.git
    git clone https://github.com/nginxinc/kubernetes-ingress.git
  • Go to the folder deployments
    • Create a namespace and a service account for the Ingress controller
      kubectl apply -f common/ns-and-sa.yaml
      check kub get ns
    • Create a secret with a TLS certificate and a key for default server in Nginx
      kubectl apply -f common/default-server-secret.yaml
    • Create a config map for customizing the NGINX configuration
      kubectl apply -f common/nginx-config.yaml
    • Create a cluster role and cluster role binding (RBAC)
      kubectl apply -f rbac/rbac.yaml
    • Create a DaemonSet/ deployment for Ingress controller
      kubectl apply -f daemon-set/nginx-ingress.yaml
    • Check all the details on
      kubectl get all -n nginx-ingress



Deploy the Application:


Deploy the application deployment and create the service using Cluster IP
kubectl expose  deployment your-appserver-deployment --port=8080


Deploying Ingress Resource:

Create a file with your-appserver-ingress.yaml and deploy the resource in Kubernetes environment 

apiVersion: networking.k8s.io/v1beta1 # for versions before 1.14 use extensions/v1beta1
kind: Ingress
metadata:
  name: appserver-ingress
  annotations:
    kubernetes.io/ingress.class: "nginx"
    nginx.ingress.kubernetes.io/affinity: "cookie"
    nginx.ingress.kubernetes.io/session-cookie-path: /
    nginx.ingress.kubernetes.io/use-regex: "true"
    nginx.ingress.kubernetes.io/satisfy: "any"
spec:
  rules:
  - host: your.appserver.com
    http:
      paths:
      - path: /v1/employees/subscription/
        backend:
          serviceName: your-appserver-deployment
          servicePort: 8080
      - path: /v1/employees/now/
        backend:
          serviceName: your-appserver-deployment
          servicePort: 8080
      - path: /v1/employees/all/
        backend:
          serviceName: your-appserver-deployment
          servicePort: 8080
      - path: /v1/employees/notification
        backend:
          serviceName: your-appserver-deployment
          servicePort: 8080


kubectl create -f your-appserver-ingress.yaml

Check the details of the ingress :

kubectl get ingress

kubectl describe ingress appserver-ingress


Adding DNS entry in Client/ Source


Add the DNS entry in the Source/ Client from where the request would be served.

10.10.10.10 your.application.com

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