connect() failed (111: Connection refused) while connecting to upstream

报错

Nginx代理Vue项目，访问基于Flask搭建的后台时，一直报出访问路径错误。查看Nginx错误日志，发现报错是connect() failed (111: Connection refused) while connecting to upstream。

$ cat /var/log/nginx/error.log2022/04/26 17:46:26 [error] 1593845#1593845: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 192.168.110.245, server: , request: "POST /api/user/login/ HTTP/1.1", upstream: "http://127.0.0.1:5000//user/login/", host: "192.168.110.228", referrer: "http://192.168.110.228/"

原因

原因是在安装flask的时候，使用时是apt安装的，而不是pip3进行安装的。

$ sudo apt install python3-flask $ flask run -h 0.0.0.0 -p 5000

解决方案

卸载掉python3-flask。

$ sudo apt remove python3-flask

使用pip3安装flask。

$ pip3 install flaskWARNING: The script flask is installed in '/data2/jing.w/.local/bin' which is not on PATH.Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.# 如果安装flask之后, 路径不在Path中, 使用软链接
$ sudo ln -s /data2/jing.w/.local/bin/flask /usr/bin/flask

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connect() failed (111 Connection refused) while connecting to upstream

connect() failed (111: Connection refused) while connecting to upstream

报错

原因

解决方案

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