【发布时间】：2021-03-07 23:42:58
【问题描述】：
我是一名编程新手，我的老板希望我在 AWS elastic beanstalk 上部署一个 dash plotly 应用程序。代码部署成功，但显示502 bad gateway 错误。
502 错误网关
nginx/1.18.0
我尝试查看 /var/log/nginx/error.log 并将端口更改为8000，但仍然无效。
这个错误的解决方法是什么？我应该添加 Procfile 吗？我应该在该文件中添加什么？提前非常感谢！
/var/log/nginx/error.log
2020/11/25 05:24:52 [error] 16068#0: *38 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:01 [error] 16068#0: *40 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:07 [error] 16068#0: *42 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:16 [error] 16545#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:22 [error] 16545#0: *3 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "dashmonitoring1-env.eba-umwfi3nn.us-east-2.elasticbeanstalk.com"
2020/11/25 05:25:22 [error] 16545#0: *5 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:22 [error] 16545#0: *3 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:8000/favicon.ico", host: "dashmonitoring1-env.eba-umwfi3nn.us-east-2.elasticbeanstalk.com", referrer: "http://dashmonitoring1-env.eba-umwfi3nn.us-east-2.elasticbeanstalk.com/"
2020/11/25 05:25:31 [error] 16545#0: *8 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:37 [error] 16545#0: *10 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:46 [error] 16545#0: *12 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:25:52 [error] 16545#0: *14 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:26:01 [error] 16545#0: *16 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.2.244, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
2020/11/25 05:26:07 [error] 16545#0: *18 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.38.82, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8000/", host: "172.31.7.83"
【问题讨论】：
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"端口改成8000" - 端口改在哪里？
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嗨@Marcin - 感谢您的回复！我更改了 application.py 中的端口 [if name == 'main': application.run(debug=True, port=8000)]
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默认端口不是5000吗？无论如何，如果你 ssh 进入 EB 实例，你能确认它在 localhost 上工作吗？
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@Marcin 对我来说默认是 8080，但错误日志建议 8000，因此我更改了它。 dash 应用在本地运行良好。
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如果我给你我最近 100 条来自 Elastic beanstalk 的日志会有用吗？我是手动部署的。
标签： python python-3.x amazon-web-services amazon-elastic-beanstalk plotly-dash