Nginx入口在Kubernetes上返回502坏网关

Question

null

kind: Pod
apiVersion: v1
metadata:
  name: dashboard-app
  labels:
    app: dashboard
spec:
  containers:
    - name: dashboard
      image: my_image_from_ecr
      ports:
        - containerPort: 8050

service-configuration-file.yml

kind: Service
apiVersion: v1
metadata:
  name: dashboard-service
spec:
  selector:
    app: dashboard
  ports:
    - port: 8050 # exposed port
      targetPort: 8050

ingress-configuration-file.yml（基于主机的路由）

kind: Ingress
metadata:
  name: dashboard-ingress
  annotations:
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
    nginx.ingress.kubernetes.io/force-ssl-redirect: "false"
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: dashboard.my_domain
    http:
      paths:
      - backend:
          serviceName: dashboard-service
          servicePort: 8050
        path: /

我遵循了以下步骤：

kubectl apply -f pod-configuration-file.yml
kubectl apply -f service-configuration-file.yml
kubectl apply -f ingress-confguration-file.yml

kubectl logs my_pod:

Dash is running on http://127.0.0.1:8050/

 Warning: This is a development server. Do not use app.run_server
 in production, use a production WSGI server like gunicorn instead.

 * Serving Flask app "annotation_analysis" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on

kubectl get ingress

NAME                           HOSTS                                            ADDRESS.           PORTS.   AGE                                                            
dashboard-ingress         dashboard.my_domain                  nginx-ingress.elb.aws-region.amazonaws.com   80      93s

kubectl describe ingress dashboard-ingress

输出结果是：

Name:             dashboard-ingress
Namespace:        default
Address:          nginx-ingress.elb.aws-region.amazonaws.com
Default backend:  default-http-backend:80 (<error: endpoints "default-http-backend" not found>)
Rules:
  Host                                            Path  Backends
  ----                                            ----  --------
  host.my-domain  
                                              /   dashboard-service:8050 (192.168.36.42:8050)
Annotations:                                      
nginx.ingress.kubernetes.io/force-ssl-redirect: false
                                              
nginx.ingress.kubernetes.io/rewrite-target: /
                                              
nginx.ingress.kubernetes.io/ssl-redirect: false
Events:                                           <none>

不幸的是，当我试图在浏览器上访问Dash应用程序时，我从Nginx得到了一个502坏网关错误。你能帮帮我吗？因为我的Kubernetes知识有限。提前谢了。

Answer 1

这与Kubernetes或AWS设置无关。我不得不将我的python破折号代码从：

if __name__ == "__main__":
    app.run_server(debug=True)

致：

if __name__ == "__main__":
    app.run_server(host='0.0.0.0',debug=True).

添加host='0.0.0.0'就成功了！