Nginx Ingress

Installation

Use the compatible version with your Kubernetes cluster, otherwise, you may get some unexpected exception or error.

1. kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.1.3/deploy/static/provider/baremetal/deploy.yaml

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Make sure pod ingress-nginx-controller-xxxx is running, otherwise using 'kubectl -n ingress-nginx get ingressclasses' and check the 'Event' part.

This YAML will create a new namespace 'ingress-nginx' for Nginx, and an Ingress Class object 'nginx' will be created too by default, you could check from Kubernetes dashboard or the CLI below

1. kubectl get ingressclasses -n ingress-nginx

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If this is only instance of the Ingresss-NGINX controller, you should add the annotation ingressclass.kubernetes.io/is-default-class in your ingress class:

1. kubectl -n ingress-nginx annotate ingressclasses nginx ingressclass.kubernetes.io/is-default-class="true"

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Verification

1. kubectl get services -n ingress-nginx

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Get the  of ingress-nginx-controller

Get node  with the following command

1. kubectl get nodes -o wide

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Access http://: in the browser, and you will get "404 Not Found" from nginx, no worry, that is because no backend service configured yet. If you are using docker desktop kubenetes, the  will be localhost. 
Now we deploy a nginx service with the following YAML to test the ingress controller,

1. apiVersion: v1
2. kind: Pod
3. metadata:
4.   name: nginx
5.   labels:
6.     app: nginx
7. spec:
8.   containers:
9.     - name: nginx
10.       image: nginx:1.18.0
11. ---
12. apiVersion: v1
13. kind: Service
14. metadata:
15.   name: nginx
16. spec:
17.   ports:
18.     - port: 80
19.       targetPort: 80
20.   selector:
21.     app: nginx
22. ---
23. apiVersion: networking.k8s.io/v1
24. kind: Ingress
25. metadata:
26.   name: example.com
27.   annotations:
28.     nginx.ingress.kubernetes.io/rewrite-target: /
29. spec:
30.   ingressClassName: nginx
31.   rules:
32.     - host: nginx.example.com
33.       http:
34.         paths:
35.           - path: /
36.             pathType: Prefix
37.             backend:
38.               service:
39.                 name: nginx
40.                 port:
41.                   number: 80

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 Use the following command to check the availability.

1. curl --location 'http://<external IP>:<ingress-nginx-node-port>' --header 'Host: nginx.example.com'

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If you aren't familiar with curl, you can use Postmen, it; 's more straightforward. If you want to verify in a browser, for example, chrome, then you need to use some plugin like ModHeader to provide the header parameter. 

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