k3s, traefik and ingress

Special thanks to just me and open source, specifically this video

# install k3s
curl -sfL https://get.k3s.io | sh -

# traefik comes as a deployment
kubectl -n kube-system get deploy

# let's enable the traefik dashboard
# notice traefik has a configmap named traefik
kubectl -n kube-system describe deploy traefik

# edit the configmap
kubectl -n kube-system edit cm traefik
# we need to add under traefik.toml:
  dashboard = true

# you can reload the pod to re-read the config by scaling the deployment
# or you can simply delete the pod and let the replicaset start a new one
kubectl -n kube-system scale deploy traefik --replicas 0
kubectl -n kube-system scale deploy traefik --replicas 1
# or
kubectl -n kube-system delete pod traefikyyyyyyyyy-zzzzz

# the traefik dashboard runs on port 8080 but only inside the cluster
# so you'll have to use port-forward to access it (unless you want to expose
# it outside of the cluster, we can talk about that later)
# once you complete the below command, open up http://localhost:8080 in a browser
kubectl -n kube-system port-forward deployment/traefik 8080

# let's deploy nginx, expose it as a service, then create an ingress
kubectl create deploy nginx --image nginx

# verify you have an nginx deployment
kubectl get deploy -o wide

# expose the deployment
kubectl expose deploy nginx --port 80

# verify you have an nginx service
kubectl get service

# create an ingress resource
# from the example here: https://github.com/rancher/k3d/blob/master/docs/usage/guides/exposing_services.md
# create a nginx-ingress.yaml:
apiVersion: extensions/v1beta1
kind: Ingress
  name: nginx
    ingress.kubernetes.io/ssl-redirect: "false"
  - http:
      - path: /
          serviceName: nginx
          servicePort: 80

kubectl create -f nginx-ingress.yaml

kubectl get ingress
kubectl describe ingress nginx

# backend IP should match nginx pod
kubectl get pods -o wide

# browse to any cluster IP
# should bring up nginx welcome page
# now browse back to the dashboard (make sure you're still port-forwarded)
# http://localhost:8080
# and you will see traefik populate a front-end and a back-end

# let's add basic auth to the nginx site
htpasswd -c ./authfile <username>
kubectl create secret generic nginx-auth --from-file authfile
kubectl get secret nginx-auth -o yaml

# then in the nginx-ingress.yaml file, add annotations under metadata:
    kubernetes.io/ingress.class: traefik
    ingress.kubernetes.io/auth-type: "basic"
    ingress.kubernetes.io/auth-realm: "nginx-auth"

# then delete and re-create the nginx ingress resource
kubectl delete -f nginx-ingress.yaml
kubectl create -f nginx-ingress.yaml