examples.md

Examples

Expose services

1. via Ingress

1. Create a cluster, mapping the ingress port 80 to localhost:8081

   k3d create --api-port 6550 --publish 8081:80 --workers 2

   • Note: --api-port 6550 is not required for the example to work. It's used to have k3s's ApiServer listening on port 6550 with that port mapped to the host system.

2. Get the kubeconfig file

   export KUBECONFIG="$(k3d get-kubeconfig --name='k3s-default')"

3. Create a nginx deployment

   kubectl create deployment nginx --image=nginx

4. Create a ClusterIP service for it

   kubectl create service clusterip nginx --tcp=80:80

5. Create an ingress object for it with kubectl apply -f

   apiVersion: extensions/v1beta1
   kind: Ingress
   metadata:
     name: nginx
     annotations:
       ingress.kubernetes.io/ssl-redirect: "false"
   spec:
     rules:
     - http:
         paths:
         - path: /
           backend:
             serviceName: nginx
             servicePort: 80

6. Curl it via localhost

   curl localhost:8081/

2. via NodePort

1. Create a cluster, mapping the port 30080 from worker-0 to localhost:8082

   k3d create --publish 8082:30080@k3d-k3s-default-worker-0 --workers 2

   • Note: Kubernetes' default NodePort range is 30000-32767

... (Steps 2 and 3 like above) ...

1. Create a NodePort service for it with kubectl apply -f

   apiVersion: v1
   kind: Service
   metadata:
     labels:
       app: nginx
     name: nginx
   spec:
     ports:
     - name: 80-80
       nodePort: 30080
       port: 80
       protocol: TCP
       targetPort: 80
     selector:
       app: nginx
     type: NodePort

2. Curl it via localhost

   curl localhost:8082/