Yesterday a friend of mine Rei Bauer told me about HTTP/3 and how much faster it made her website.

She got new tools, I WANT THAT TOO.

For me that wasn't a 5 minutes job as I had to replace ingress-nginx with traefik.

Remove the current L7 Loadbalancer

• Remove Traefik

  I have choosen to not use the k3s/rancher version (v2.6.x) of Traefik but use the latest and greatest (v2.8.x), so i modified my k3s with the following command:

  Do NOT use that command as is

  curl -sfL https://get.k3s.io | sh -s - server --datastore-endpoint="mysql://k3s:<mysqlpw>@tcp(maxscale-rw.example.com:3306)/k3s" --disable servicelb --disable traefik
  

  Let's see what it does:

  • --disable servicelb - Do not install servicelb, I replaced it with metallb.
  • --disable traefik - Do not install traefik

  When you use the given command (with your own "datastore-endpoint") you will see that you loose access to all L7 Ingresses, so please be aware of that and make sure you have access over ssh to your cluster.

• Remove ingress-nginx

  helm uninstall -n kube-system ingress-nginx
  

  If you haven't lost layer 7 access to your cluster in the last step you will loose it now :)

Install traefik from the upstream sources

• Add the upstream helm catalog

  helm repo add traefik https://helm.traefik.io/traefik
  

• Save my traefik-values.yaml somewhere:

  rbac:
    enabled: true
  ports:
    web:
      hostPort: 80
    websecure:
      hostPort: 443
      http3:
        advertisedPort: 443
      tls:
        enabled: true
  podAnnotations:
    prometheus.io/port: "8082"
    prometheus.io/scrape: "true"
  providers:
    kubernetesIngress:
      publishedService:
        enabled: true
  priorityClassName: "system-cluster-critical"
  tolerations:
  - key: "CriticalAddonsOnly"
    operator: "Exists"
  - key: "node-role.kubernetes.io/control-plane"
    operator: "Exists"
    effect: "NoSchedule"
  - key: "node-role.kubernetes.io/master"
    operator: "Exists"
    effect: "NoSchedule"
  service:
    type: NodePort
    ipFamilyPolicy: "PreferDualStack"
  
  experimental:
    http3:
      enabled: true
  additionalArguments:
    - "--accesslog"
    - "--providers.kubernetesingress.allowexternalnameservices"
    - "--providers.kubernetescrd.allowexternalnameservices"
    - "--entrypoints.websecure.http3.advertisedport=443"
    - "--certificatesresolvers.letsencrypt-prod.acme.tlschallenge"
    - "--certificatesresolvers.letsencrypt-prod.acme.email=support@example.com"
    - "--certificatesresolvers.letsencrypt-prod.acme.storage=/data/acme.json"
    - "--certificatesresolvers.letsencrypt-prod.acme.caserver=https://acme-v02.api.letsencrypt.org/directory"
  image:
    name: traefik
    tag: v2.8.4
  proxyProtocol:
    enabled: true
    trustedIPs:
      - 10.0.0.0/8
  forwardedHeaders:
    enabled: true
    trustedIPs:
      - 10.0.0.0/8
  ssl:
    enabled: true
    permanentRedirect: true
  

• Change the acme email address there

• Install traefik

  helm install -n kube-system traefik traefik/traefik -f traefik-values.yaml
  

Have fun with Traefik, it's internal ACME resolver and HTTP/3.