本地K8s部署Angular+NestJS应用遇Ingress Nginx 500无日志报错

我正尝试在本地Windows机器上，使用Docker和Kubernetes Ingress部署Angular前端、NestJS后端的应用。本地环境下应用运行正常，推送至Docker Hub后的镜像也能正常运行，但部署到Kubernetes后访问始终出现500错误。

注：Ingress控制器未显示任何错误信息！

后端部署配置 #

apiVersion: apps/v1
kind: Deployment
metadata:
  name: smartagri-back 
spec:
  replicas: 1
  selector:
    matchLabels:
      app: smartagri-back
  template:
    metadata:
      labels:
        app: smartagri-back
    spec:
      containers:
      - name: smartagri-back
        image: maryem1994/smartagri:back-3
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: smartagri-back
spec:
  type: ClusterIP
  ports:
  - port: 80
  selector:
    app: smartagri-back

前端部署配置 #

apiVersion: apps/v1
kind: Deployment
metadata:
  name: smartagri-front 
spec:
  replicas: 1
  selector:
    matchLabels:
      app: smartagri-front
  template:
    metadata:
      labels:
        app: smartagri-front
    spec:
      containers:
      - name: smartagri-front
        image: maryem1994/smartagri:front-3
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: smartagri-front
spec:
  type: ClusterIP
  ports:
  - port: 80
  selector:
    app: smartagri-front

Nginx Ingress配置 #

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-service
  annotations:
    nginx.ingress.kubernetes.io/use-regex: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  ingressClassName: nginx
  rules:
    - host: smartagri-app.com
      http:
        paths:
          - path: /saback
            pathType: Prefix
            backend:
              service:
                name: smartagri-back
                port:
                  number: 80
          - path: /
            pathType: Prefix
            backend:
              service:
                name: smartagri-front
                port:
                  number: 80

排查建议 #

• 检查Pod运行状态：执行kubectl get pods，确认两个应用的Pod处于Running状态，重启次数为0
• 查看应用日志：分别执行kubectl logs <smartagri-back-pod-name>和kubectl logs <smartagri-front-pod-name>，排查应用自身是否抛出异常
• 测试集群内服务连通性：启动临时测试Pod（kubectl run -it --rm busybox --image=busybox:1.28 -- sh），在其中访问http://smartagri-back和http://smartagri-front，确认服务能正常响应
• 验证后端端口配置：确认NestJS应用实际监听的端口是80，Dockerfile中是否正确暴露端口，启动命令是否指定了正确端口
• 检查前端API请求路径：Angular前端调用后端的接口路径是否匹配Ingress的/saback前缀，若前端原本请求/api开头的接口，需调整Ingrewrite规则或前端代理配置
• 调整Ingrewrite规则：当前配置会将/saback/xxx重写为/xxx转发到后端，如果后端接口本身带有/saback前缀，需修改rewrite-target为/$2，同时将path改为/saback(/|$)(.*)

内容的提问来源于stack exchange，提问作者maryem neyli