example of using Kubernetes with traefik and lets encrypt to generate SSL Certificates (without the need of adding any additional cluster issuer)

ingress-service-app-.yaml

apiVersion: v1
kind: Service
metadata:
  name: app
  namespace: default
spec:
  selector:
    app: app
  ports:
    - protocol: TCP
      name: web
      port: 80
      targetPort: 80
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-deployment
  namespace: default
  labels:
    app: app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
      - name: app
        image: nginx:latest
        ports:
        - containerPort: 80
---
apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: nginx-secure
spec:
  entryPoints:
    - websecure
  routes:
  - match: Host(`nginx.erickwendel.com.br`)
    kind: Rule
    services:
    - name: app
      port: 80
  tls:
    certResolver: letsencrypt

traefik-values.yaml

  additionalArguments:
    - "--metrics.prometheus=true"
    - "--metrics.prometheus.entryPoint=metrics"
    - "--metrics.prometheus.buckets=0.1,0.3,1.2,5.0"

  persistence:
    enabled: true
    accessMode: ReadWriteOnce
    size: 128Mi
    storageClass: "managed-csi"
    path: /data
    name: traefik

  certResolvers:
    letsencrypt:
      email: your-email@gmail.com
      caServer: https://acme-v02.api.letsencrypt.org/directory # Production server
      # caServer: https://acme-staging-v02.api.letsencrypt.org/directory # Staging server
      httpChallenge:
          entryPoint: web
      storage: /data/acme.json

  deployment:
    initContainers:
      - name: volume-permissions
        image: busybox:latest
        command: ["sh", "-c", "ls -la /; touch /data/acme.json; chmod -v 600 /data/acme.json"]
        volumeMounts:
        - mountPath: /data
          name: traefik
  podSecurityContext:
    fsGroup: 65532
    fsGroupChangePolicy: "OnRootMismatch"