Kubernetes Ingress 连接超时问题：无法通过 DNS 访问微服务

Question

我正在尝试使用 k8s 开发一个微服务应用程序，这是我的第一个微服务应用程序方法。我的deployment.yaml配置的目标是创建3个具有相关服务的部署：

• db：postgres 数据库。暴露端口5432
• MainApi：公开端口 3000 的节点 api。它向 postgres 数据库发出请求。
• fastApi：用于AI处理和数据集清理的python api。暴露8000端口

这是我的部署.yaml：

apiVersion: v1
kind: Service
metadata:
  name: db
spec:
  selector:
    app: db
  ports:
    - protocol: TCP
      port: 5432
      targetPort: 5432
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: db
spec:
  replicas: 1
  selector:
    matchLabels:
      app: db
  template:
    metadata:
      labels:
        app: db
    spec:
      containers:
        - name: db
          image: myName/db
          env:
            - name: POSTGRES_PASSWORD
              value: root
            - name: POSTGRES_USER
              value: postgres
          ports:
            - containerPort: 5432
          resources:
            requests:
              memory: "128Mi"
              cpu: "0.5"
            limits:
              memory: "1024Mi"
              cpu: "1"
---
apiVersion: v1
kind: Service
metadata:
  name: mainapi
spec:
  selector:
    app: mainapi
  ports:
    - protocol: TCP
      port: 3000
      targetPort: 3000
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mainapi
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mainapi
  template:
    metadata:
      labels:
        app: mainapi
    spec:
      containers:
        - name: mainapi
          image: myName/mainapi
          ports:
            - containerPort: 3000
          resources:
            requests:
              memory: "128Mi"
              cpu: "0.5"
            limits:
              memory: "1024Mi"
              cpu: "2"
---
apiVersion: v1
kind: Service
metadata:
  name: fastapi
spec:
  selector:
    app: fastapi
  ports:
    - protocol: TCP
      port: 8000
      targetPort: 8000
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: fastapi
spec:
  replicas: 2
  selector:
    matchLabels:
      app: fastapi
  template:
    metadata:
      labels:
        app: fastapi
    spec:
      containers:
        - name: fastapi
          image: myName/fastapi
          ports:
            - containerPort: 8000
          resources:
            requests:
              memory: "512Mi"
              cpu: "0.5"
            limits:
              memory: "2048Mi"
              cpu: "2"
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: progettoviaggio
  labels:
    name: progettoviaggio
spec:
  rules:
    - host: progettoviaggio.test
      http:
        paths:
          - path: "/"
            pathType: Prefix
            backend:
              service:
                name: mainapi
                port:
                  number: 3000

我的目标是有一个 dns“progettoviaggio.test”来连接前端应用程序。经过一些研究，我发现使用“入口”是可能的，在遵循一些教程后，我设置了入口，并复制了发现的 IP 地址

kubectl get ingress

我已将“progettoviaggio.test”映射到

/etc/hosts

文件中的地址。 然后我检查所有 Pod、服务和入口是否正常工作

kubectl get pods

db-678448cf9c-v46bx        1/1     Running   1 (2d ago)    3d3h
fastapi-d59547d78-bx7zf    1/1     Running   1 (2d ago)    3d3h
fastapi-d59547d78-vr8lh    1/1     Running   1 (2d ago)    3d3h
mainapi-7c75577989-mdzpf   1/1     Running   10 (2d ago)   3d3h

kubectl get services

NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
db           ClusterIP   10.105.116.51    <none>        5432/TCP   3d7h
fastapi      ClusterIP   10.110.190.84    <none>        8000/TCP   3d7h
kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP    3d7h
mainapi      ClusterIP   10.101.218.237   <none>        3000/TCP   3d7h

kubectl get ingress

NAME              CLASS   HOSTS                  ADDRESS        PORTS   AGE
progettoviaggio   nginx   progettoviaggio.test   192.168.49.2   80      2d1h

毕竟我尝试连接到“progettoviaggio.test”，但响应是：

ERR_CONNECTION_TIMED_OUT

• 我尝试单独公开服务，效果很好。
• 重启docker
• 将服务类型更改为

  LoadBalancer

  和

  NodePort

  ，但结果保持不变
• 我已经验证集群内的所有 Pod 都可以多次访问，并且一切正常

我的系统配置： MacBookPro 18,1 CPU：M1 Pro 10核 显卡：M1 Pro 16核 内存：32GB 库伯内特斯： 客户端版本：v1.29.1 Kustomize版本：v5.0.4-0.20230601165947-6ce0bf390ce3 服务器版本：v1.26.3 minikube版本：v1.30.1 docker版本：24.0.7 darwin/arm64

** 根据评论的要求进行更新

kubectl get svc -A

NAMESPACE              NAME                                 TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE
default                db                                   ClusterIP   10.105.116.51    <none>        5432/TCP                     4d5h
default                fastapi                              ClusterIP   10.110.190.84    <none>        8000/TCP                     4d5h
default                kubernetes                           ClusterIP   10.96.0.1        <none>        443/TCP                      4d5h
default                mainapi                              ClusterIP   10.101.218.237   <none>        3000/TCP                     4d5h
ingress-nginx          ingress-nginx-controller             NodePort    10.96.145.16     <none>        80:30959/TCP,443:31788/TCP   3d
ingress-nginx          ingress-nginx-controller-admission   ClusterIP   10.104.140.143   <none>        443/TCP                      3d
kube-system            kube-dns                             ClusterIP   10.96.0.10       <none>        53/UDP,53/TCP,9153/TCP       4d5h
kubernetes-dashboard   dashboard-metrics-scraper            ClusterIP   10.99.56.183     <none>        8000/TCP                     4d2h
kubernetes-dashboard   kubernetes-dashboard                 ClusterIP   10.96.209.32     <none>        443/TCP                      4d2h

谢谢大家的帮助

Answer 1

我看到你的yaml文件没问题，但是当你在Minikube中运行Kubernetes集群时，这里你需要使用kubectl port-forward或minikubetunnel。