Why is my Flask app running on port 5000 even though I specified another containerPort in deployment.yaml file?

huangapple
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英文:

Why is my Flask app running on port 5000 even though I specified another containerPort in deployment.yaml file?

问题

我有一个Python应用程序

  1. from flask import Flask, jsonify
  3. app = Flask(__name__)
  5. @app.route("/")
  6. def index():
  7.     return jsonify({"hey": "test6"})

以及一个deployment.yaml文件

  1. apiVersion: apps/v1
  2. kind: Deployment
  3. metadata:
  4.   name: mqttdemob
  5.   namespace: default
  6. spec:
  7.   replicas: 1
  8.   selector:
  9.     matchLabels:
  10.       app: mqttdemob
  11.   strategy: {}
  12.   template:
  13.     metadata:
  14.       labels:
  15.         app: mqttdemob
  16.     spec:
  17.       containers:
  18.       - image: ****/fluxdemo:main-584db7b6-1687862454 # {"$imagepolicy": "flux-system:mqttdemob"}
  19.         name: app
  20.         ports:
  21.         - containerPort: 6000

以及一个service.yaml文件

  1. apiVersion: v1
  2. kind: Service
  3. metadata:
  4.   name: mqttdemob
  5. spec:
  6.   selector:
  7.     app: mqttdemob
  8.   ports:
  9.     - protocol: TCP
  10.       port: 6000
  11.       targetPort: 6000
  12.       nodePort: 30400
  13.   externalIPs:
  14.     - 1.2.4.122
  15.   type: NodePort

当我使用这些文件部署时，我希望Flask应用程序在端口6000上运行，然后将其转发到30400。

但是，当我运行

kubectl exec <pod name> -- netstat -tulpn

它输出

  1. Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
  2. tcp        0      0 0.0.0.0:5000            0.0.0.0:*               LISTEN      1/python

这表明它没有使用端口6000，而是使用了端口5000。

我做错了什么，如何确保Flask使用端口6000而不是5000？

英文:

I have a python app

  1. from flask import Flask, jsonify
  3. app = Flask(__name__)
  6. @app.route(&quot;/&quot;)
  7. def index():
  8.     return jsonify({&quot;hey&quot;:&quot;test6&quot;})

And a deployment.yaml file

  1. 	apiVersion: apps/v1
  2. 	kind: Deployment
  3. 	metadata:
  4. 	  name: mqttdemob
  5. 	  namespace: default
  6. 	spec:
  7. 	  replicas: 1
  8. 	  selector:
  9. 		matchLabels:
  10. 		  app: mqttdemob
  11. 	  strategy: {}
  12. 	  template:
  13. 		metadata:
  14. 		  labels:
  15. 			app: mqttdemob
  16. 		spec:
  17. 		  containers:
  18. 		  - image: ****/fluxdemo:main-584db7b6-1687862454 # {&quot;$imagepolicy&quot;: &quot;flux-system:mqttdemob&quot;}
  19. 			name: app
  20. 			ports:
  21. 			- containerPort: 6000

And a service.yaml file

  1. 	apiVersion: v1
  2. 	kind: Service
  3. 	metadata:
  4. 	  name: mqttdemob
  5. 	spec:
  6. 	  selector:
  7. 		app: mqttdemob
  8. 	  ports:
  9. 		- protocol: TCP
  10. 		  port: 6000
  11. 		  targetPort: 6000
  12. 		  nodePort: 30400
  13. 	  externalIPs:
  14. 		- 1.2.4.122
  15. 	  type: NodePort

When I deploy using these files I would want the Flask app to run on port 6000 which then would be forwarded to 30400.

But when I run

kubectl exec &lt;pod name&gt; -- netstat -tulpn

It outputs

  1.  Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
  2.  tcp        0      0 0.0.0.0:5000            0.0.0.0:*               LISTEN      1/python

Such that it is not using port 6000 but port 5000.

What am I doing wrong and how can I make sure that Flask will use port 6000 instead of 5000?

答案1

得分: 2

containerPort 仅供信息参考，不配置你的应用程序运行的端口。

你的 Flask 应用程序正在使用其默认端口。
尝试在启动服务器的主文件中更改它：

  1. port = 6000 # 你可以将它更改为任何未使用的端口。
  2. if __name__ == '__main__':
  3.     app.run(host='0.0.0.0', port)

上述情况中的 "未使用" 意味着当前没有在使用的端口。

英文:

containerPort is only informational and doesn't configure the port your app is running on.

You flask application is using its default port.
Try changing it in you main file where you are starting your server using:

  1. port = 6000 #you can change it to any unused port.
  2. if __name__ == &#39;__main__&#39;:
  3.     app.run(host=&#39;0.0.0.0&#39;, port)
  • unused in the above case means the port which is currently not in use.

huangapple
  • 本文由 发表于 2023年6月27日 18:55:07
  • 转载请务必保留本文链接：https://go.coder-hub.com/76564144.html
  • flask
  • kubernetes
  • python
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