k3s on Raspberry Pi: Installing nginx

6 Feb 2020 17:44 k3s raspberry-pi

Start nginx, with 3 replicas:

$ sudo kubectl run nginx-1 --image=nginx --replicas=3 --port=80

You can see that 3 “pods” have been started:

$ sudo kubectl get pods
NAME                          READY   STATUS    RESTARTS   AGE
nginx-1-775985c86-m7ktb       1/1     Running   0          12s
nginx-1-775985c86-z26d2       1/1     Running   0          12s
nginx-1-775985c86-m7x75       1/1     Running   0          12s

Then you need to make nginx available. This uses the default ‘ClusterIP’ type. I don’t know enough about the other options to make an intelligent choice here.

$ sudo kubectl expose deployment nginx-1 --port 80
$ sudo kubectl get endpoints nginx-1
NAME      ENDPOINTS                                   AGE
nginx-1,,   5h20m

As you can see, there are three different endpoints – one for each pod. They’re using cluster-internal IP addresses.

This allows us to access one of the instances from inside the cluster:

$ curl
<!DOCTYPE html>
<title>Welcome to nginx!</title>

Optional: Clean up

$ sudo kubectl delete service nginx-1
service "nginx-1" deleted
$ sudo kubectl delete deployment nginx-1
deployment.apps "nginx-1" deleted