参考にしたサイト
https://medium.com/better-programming/how-to-expose-your-services-with-kubernetes-ingress-7f34eb6c9b5a

サンプル用のサービス作成

simple-service.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hellok8s-deployment
  labels:
    app: hellok8s
spec:
  selector:
    matchLabels:
      app: hellok8s
  template:
    metadata:
      labels:
        app: hellok8s
    spec:
      containers:
      - name: hellok8s
        image: docker.io/rlkamradt/hellok8s:latest
        ports:
        - containerPort: 8080
---
apiVersion: v1
kind: Service
metadata:
  name: hellok8s-service
spec:
  type: ClusterIP
  selector:
    app: hellok8s
  ports:
  - port: 8080
    targetPort: 8080

Ingress-nginx-controller作成

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/baremetal/deploy.yaml

Ingress-nginx-controllerサービス情報編集

kubectl edit service ingress-nginx-controller -n ingress-nginx

- type: NodePort
+ type: LoadBalancer
+ externalIPs:
+ - 192.168.0.xx

ClusterIssuerの作成
当たり前だが、ルータのポート80を対象マシン向けにポート変換指定しておかないと認証が失敗するので注意(1敗)

letsencrypt-prod.yaml

apiVersion: cert-manager.io/v1alpha3
kind: ClusterIssuer
metadata:
  name: letsencrypt-production
spec:
  acme:
    email: yourmailaddress
    server: https://acme-v02.api.letsencrypt.org/directory
    privateKeySecretRef:
      name: letsencrypt-production
    solvers:
    - http01:
        ingress:
          class: nginx

Ingressの作成

simple-ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test-ingress
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
    kubernetes.io/ingress.class: "nginx"
    cert-manager.io/cluster-issuer: "letsencrypt-production"
spec:
  tls:
  - hosts:
    - yourdomain
    secretName: test-tls-prod
  rules:
  - host: yourdomain
    http:
      paths:
      - path: /testpath
        backend:
          serviceName: hellok8s-service
          servicePort: 8080

接続確認