Nginx Ingress
Installation
Use the compatible version with your Kubernetes cluster, otherwise, you may get some unexpected exception or error.
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.1.3/deploy/static/provider/baremetal/deploy.yaml
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
kubectl get ingressclasses -n ingress-nginx
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:
kubectl -n ingress-nginx annotate ingressclasses nginx ingressclass.kubernetes.io/is-default-class="true"
Verification
kubectl get services -n ingress-nginx
Get the <ingress-nginx-node-port> of ingress-nginx-controller
Get node <external IP> with the following command
kubectl get nodes -o wide
Access http://<external IP>:<ingress-nginx-node-port> 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 <external IP> will be localhost.
Now we deploy a nginx service with the following YAML to test the ingress controller,
apiVersion: v1 kind: Pod metadata: name: nginx labels: app: nginx spec: containers: - name: nginx image: nginx:1.18.0 --- apiVersion: v1 kind: Service metadata: name: nginx spec: ports: - port: 80 targetPort: 80 selector: app: nginx --- apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: example.com annotations: nginx.ingress.kubernetes.io/rewrite-target: / spec: ingressClassName: nginx rules: - host: nginx.example.com http: paths: - path: / pathType: Prefix backend: service: name: nginx port: number: 80
Use the following command to check the availability.
curl --location 'http://<external IP>:<ingress-nginx-node-port>' --header 'Host: nginx.example.com'
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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