# Basic usage - NGINX Ingress Controller

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# Basic usage - host based routing

ingress-nginx can be used for many use cases, inside various cloud provider and supports a lot of configurations. In this section you can find a common usage scenario where a single load balancer powered by ingress-nginx will route traffic to 2 different HTTP backend services based on the host name.

First of all follow the instructions to install ingress-nginx. Then imagine that you need to expose 2 HTTP services already installed: `myServiceA`, `myServiceB`. Let's say that you want to expose the first at `myServiceA.foo.org` and the second at `myServiceB.foo.org`. One possible solution is to create two ingress resources:

    apiVersion: networking.k8s.io/v1beta1
    kind: Ingress
    metadata:
      name: ingress-myservicea
      annotations:
        # use the shared ingress-nginx
        kubernetes.io/ingress.class: "nginx"
    spec:
      rules:
      - host: myservicea.foo.org
        http:
          paths:
          - path: /
            backend:
              serviceName: myservicea
              servicePort: 80
    ---
    apiVersion: networking.k8s.io/v1beta1
    kind: Ingress
    metadata:
      name: ingress-myserviceb
      annotations:
        # use the shared ingress-nginx
        kubernetes.io/ingress.class: "nginx"
    spec:
      rules:
      - host: myserviceb.foo.org
        http:
          paths:
          - path: /
            backend:
              serviceName: myserviceb
              servicePort: 80

When you apply this yaml, 2 ingress resources will be created managed by the ingress-nginx instance. Nginx is configured to automatically discover all ingress with the `kubernetes.io/ingress.class: "nginx"` annotation. Please note that the ingress resource should be placed inside the same namespace of the backend resource.

On many cloud providers ingress-nginx will also create the corresponding Load Balancer resource. All you have to do is get the external IP and add a DNS `A record` inside your DNS provider that point myServiceA.foo.org and myServiceB.foo.org to the nginx external IP. Get the external IP by running:

    kubectl get services -n ingress-nginx