使用 FlaskApp 配置 uWSGI

Question

为了切换到 Nginx，我运行遇到配置问题并收到 502 网关错误。这是连接错误日志：

tail -f error.log
2016/10/08 16:09:31 [crit] 21682#21682: *29 connect() to unix:/var/www/FlaskApp/FlaskApp/runserver.sock failed (13: Permission denied) while connecting to upstream, client: 73.188.249.47, server: ceejcalvert.com, request: "GET / HTTP/1.1", upstream: "uwsgi://unix:/var/www/FlaskApp/FlaskApp/runserver.sock:", host: "website.com"

如果我在服务器的终端中，我可以通过以下方式手动引导套接字来启动站点：

如果运行:

，此命令将使一切正常

uwsgi -s /var/www/FlaskApp/FlaskApp/runserver.sock -w runserver:app --chmod-socket=666

问题是我无法让它在守护进程模式下工作。我的配置如下：

$ cat /etc/systemd/system/runserver.service 

[Unit]
Description=uWSGI instance to serve runserver
After=network.target

[Service]
User=username
Group=www-data
WorkingDirectory=/var/www/FlaskApp/FlaskApp
Environment="PATH=/var/www/FlaskApp/FlaskApp/venv/bin"
ExecStart=/var/www/FlaskApp/FlaskApp/venv/bin/runserver.sock --ini runserver.ini

[Install]
WantedBy=multi-user.target

...

cat /var/www/FlaskApp/FlaskApp/runserver.ini 

[uwsgi]
module = wsgi:app

master = true
processes = 5

logto = /home/jmc856/error.log

socket = runserver.sock
chmod-socket = 666
vacuum = true

die-on-term = true

假设站点可用链接到站点启用

cat /etc/nginx/sites-available/runserver 

server {
    listen 80;
    server_name website.com;

location / {
    include uwsgi_params;
    uwsgi_pass unix:/var/www/FlaskApp/FlaskApp/runserver.sock;
    }
}

我明显遗漏了什么吗？

当我运行以下时，我得到退出代码 3。

sudo systemctl status runserver

runserver.service - uWSGI instance to serve runserver
Loaded: loaded (/etc/systemd/system/runserver.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sat 2016-10-08 16:08:45 EDT; 20min ago
Main PID: 22365 (code=exited, status=203/EXEC)

Oct 08 16:08:45 FirstNameLastName.com systemd[1]: Stopped uWSGI instance to serve runserver.
Oct 08 16:08:45 FirstNameLastName.com systemd[1]: Started uWSGI instance to serve runserver.
Oct 08 16:08:45 FirstNameLastName.com systemd[1]: runserver.service: Main process exited, code=exited, status=203/EXEC
Oct 08 16:08:45 FirstNameLastName.com systemd[1]: runserver.service: Unit entered failed state.
Oct 08 16:08:45 FirstNameLastName.com systemd[1]: runserver.service: Failed with result 'exit-code'.

Answer 1

我一直在为我所有的 nginx 和 flask 应用程序使用这个 Docker 图像 https://github.com/tiangolo/uwsgi-nginx-flask-docker

Answer 2

解决了我的问题。在大多数情况下，我的配置都很好。如果您收到 502 网关错误，请确保以下事项的清单。

1) 我首先将所有绝对路径添加到配置文件。例如，我将 systemd 配置更改为：

$ cat /etc/systemd/system/runserver.service 

[Unit]
Description=uWSGI instance to serve runserver
After=network.target

[Service]
User=username
Group=www-data
WorkingDirectory=/var/www/FlaskApp/FlaskApp
Environment="PATH=/var/www/FlaskApp/FlaskApp/venv/bin"
ExecStart=/var/www/FlaskApp/FlaskApp/venv/bin/runserver.sock --ini    /var/www/FlaskApp/FlaskApp/runserver.ini

[安装] WantedBy=多-user.target

2) 更改.ini 文件以直接调用 uWSGI 应用程序：

 cat /var/www/FlaskApp/FlaskApp/runserver.ini 

[uwsgi]
chdir=/var/Webpage/
wsgi-file = wsgi.py
callable = app

master = true
processes = 5

logto = /home/error.log

socket = runserver.sock
chmod-socket = 666
vacuum = true

die-on-term = true

3) 确保 FlaskApp 主机为 0.0.0.0:

if __name__ == "__main__":
app.run(host='0.0.0.0')

4) 使用这些命令尝试找出失败的地方。

确保配置具有正确的语法

$ sudo nginx -t

确保 nginx 守护进程运行正确

$ systemctl status nginx.service

确保服务于{app}的uWSGI实例是运行。

$ systemctl

如果一切正常但仍然发现错误，请在

中搜索失败

$ sudo journalctl

和

$ sudo tail -f /var/log/nginx/error.log

如果一切正常运行，请确保执行以下操作：

$ sudo systemctl restart {app}
$ sudo start {app}
$ sudo enable {app}

最后一个命令是我忘记的东西，它让我很长一段时间都没有意识到我的配置是好的。在我的例子中，{app} 是 'runserver'

使用 FlaskApp 配置 uWSGI

uWSGI configuration with FlaskApp

flask

uwsgi

systemd

ubuntu-16.04