---

前言

可以使用Ingress或者IngressRoute结合traefik做服务的网关。

---

一、Ingress的方式

1、创建默认服务

（1）default-backend.yaml

[root@k8s-master 2]# cat default-backend.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: default-http-backend
  labels:
    app: default-http-backend
    namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: default-http-backend
  template:
    metadata:
      labels:
        app: default-http-backend
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - name: default-http-backend
        # Any image is permissible as long as:
        # 1. It serves a 404 page at /
        # 2. It serves 200 on a /healthz endpoint
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/defaultbackend:1.4
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        ports:
        - containerPort: 8080
        resources:
          limits:
            cpu: 10m
            memory: 20Mi
          requests:
            cpu: 10m
            memory: 20Mi
---

apiVersion: v1
kind: Service
metadata:
  name: default-http-backend
  namespace: default
  labels:
    app: default-http-backend
spec:
  ports:
  - port: 80
    targetPort: 8080
  selector:
    app: default-http-backend

（2）创建

[root@k8s-master 2]# kubectl create -f default-backend.yaml
deployment.apps/default-http-backend created
service/default-http-backend created

2、创建应用服务

这里用nginx代替应用服务

（1）nginx-service.yaml

[root@k8s-master 2]# cat nginx-service.yaml
---
apiVersion: v1
kind: Service
metadata:
  name: nginx-service
  labels:
    app: nginx-deployment-test-04
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
    nodePort: 32001
  selector:
    app: nginx-deployment-test-04
  type: NodePort
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment-04
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx-deployment-test-04
  template:
    metadata:
      labels:
        app: nginx-deployment-test-04
    spec:
      containers:
      - name: nginx-deployment-test-04
        image: nginx:1.20
        ports:
        - containerPort: 80

（2）创建

[root@k8s-master 2]# kubectl create -f nginx-service.yaml
service/nginx-service created
deployment.apps/nginx-deployment-04 created

3、创建Ingress

（1）nginx-ingress.yaml

[root@k8s-master 2]# cat nginx-ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: test-ingress-01
  annotations:
    kubernetes.io/ingress.class: traefik-v2.5
spec:
  defaultBackend:
    service:
      name : default-http-backend
      port:
        number: 80
  rules:
    - http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name : nginx-service
                port:
                  number: 80

      host: www.iscas.com

（2）创建

[root@k8s-master 2]# kubectl create -f nginx-ingress.yaml
ingress.networking.k8s.io/test-ingress-01 created

4、配置ip域名

172.16.10.158   www.iscas.com

5、访问

http://www.iscas.com/

二、IngressRoute的方式

1、删除上面创建的Ingress

[root@k8s-master 2]# kubectl delete -f nginx-ingress.yaml
ingress.networking.k8s.io "test-ingress-01" deleted

2、创建IngressRoute

（1）nginx-ingressroute.yaml

[root@k8s-master 2]# cat nginx-ingressroute.yaml
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: nginx-route
  annotations:
    kubernetes.io/ingress.class: traefik-v2.5
spec:
  entryPoints:
    - web
  routes:
  - match: Host(`www.iscas.com`) && PathPrefix(`/`)
    kind: Rule
    services:
    - name: nginx-service
      port: 80

（2）创建

[root@k8s-master 2]# kubectl create -f nginx-ingressroute.yaml
ingressroute.traefik.containo.us/nginx-route created

3、访问

访问 http://www.iscas.com/ ，同样能够访问到nginx服务