Create NGINX ingress with traefik in M3S

With these example we will create a nginx Webserver and publish the Website with the traefik 2.x ingress.

kubectl create  -f nginx.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  namespace: default
  labels:
    app: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
          - name: web
            containerPort: 80

kubectl create  -f nginx-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: nginx-service

spec:
  ports:
    - protocol: TCP
      name: web
      port: 80
  selector:
    app: nginx

kubectl create  -f nginx-traefik.yaml

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: nginx-traefik
  namespace: default
spec:
  entryPoints:
    - web
  routes:
  - match: Host(`your.example.com`)
    kind: Rule
    services:
    - name: nginx-service
      port: 80

In the traefik Dasboard we will see our new rule:

kubectl port-forward $(kubectl get pods --selector "app.kubernetes.io/name=traefik" --output=name -n kube-system) -n kube-system 9000:9000

Now we can try to access nginx via traefik. First, we have to know the port of the k3sagent.

dig _http._k3sagent._tcp.m3s.mesos SRV

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.3 <<>> _http._k3sagent._tcp.m3s.mesos SRV
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4134
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; QUESTION SECTION:
;_http._k3sagent._tcp.m3s.mesos.	IN	SRV

;; ANSWER SECTION:
_http._k3sagent._tcp.m3s.mesos.	60 IN	SRV	0 1 31863 k3sagent-kzk51-s0.m3s.mesos.

;; ADDITIONAL SECTION:
k3sagent-kzk51-s0.m3s.mesos. 60	IN	A	10.1.1.11

;; Query time: 2 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Aug 04 09:08:47 UTC 2021
;; MSG SIZE  rcvd: 111

As we can see, the port is 31863 for the port 80. The agents IP is 10.1.1.11. If we have multiple k3sagents, we will see all IP adresses.

These IP adress we have to add into the /etc/hosts file.

10.1.1.11 your.example.com

Now we can access nginx:

curl -vvv your.example.com:31863