Traefik (v2) - Ingress Controller (NodePort)

Traefik is a open source Edge Router which is usable as a ingress controller for kubernetes.
It supports both the kubernetes Ingress object (extensions/v1beta1) as well as the traefik provided CDRs (custom resource definition).

Traefik is very customizable and can do very much for you, but all of its features can not be covered in this message, if you wish to find more information, check out the official documentation!

This installation is inline with what comes by default with K3s the service for this will be a NodePort service.

External access to your services

To expose a standard http service to the external net, you can either use the kubernetes internal Ingress object as follows:


apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: yourapp-ingress
  namespace: default
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: www.example.com
    http:
      paths:
      - path: /
        backend:
          serviceName: yourapp-service
          servicePort: http

Traefik also includes a CRD called IngressRoute, which would look like this:


apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: yourapp-ingress
  namespace: default
spec:
  entryPoints:
    - web
    - websecure
  routes:
    - kind: Rule
      match: (Path(`/`)
      services:
        - kind: Service
          name: yourapp-service
          namespace: default
          port: http

This will open up http://www.example.com (assuming you pointed that non-real domain record to your cluster's IPs) to the whole world.

Port 80 and 443 are both exposed through a NodePort service.