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

Question

Hi,

I have update my website build on flask by pulling updates from git and I got this:

2020/01/10 20:42:02 [error] 2906#2906: *1 connect() to unix:/home/bartek/config/website.sock failed (111: Connection refused) while connecting to upstream, client: 84.213.215.255, server: bartoszkobylinski.com, request: "GET /favicon.ico HTTP/1.1", upstream: "uwsgi://unix:/home/bartek/config/website.sock:", host: "bartoszkobylinski.com", referrer: "http://bartoszkobylinski.com/"

I haven’t done anything else just pulling repo. I reboot server. I have checked uwsgi settings and nginx but nothing has changed. I have seen many same issue with it where it was to many services going but I have checked with command netstat -plant and I got this:

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      2902/nginx: master  
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      714/systemd-resolve 
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      918/sshd            
tcp        0      0 142.93.100.171:22       106.52.102.190:50886    ESTABLISHED 3001/sshd: [accepte 
tcp        0      0 142.93.100.171:22       84.213.215.255:46096    ESTABLISHED 1756/sshd: bartek [ 
tcp        0      0 142.93.100.171:22       203.220.101.126:25270   ESTABLISHED 3031/sshd: unknown  
tcp        0      0 142.93.100.171:22       218.92.0.202:52288      SYN_RECV    -                   
tcp        0      0 142.93.100.171:22       218.92.0.202:36789      SYN_RECV    -                   
tcp        0      0 142.93.100.171:22       84.213.215.255:46010    ESTABLISHED 1477/sshd: bartek [ 
tcp        0      0 142.93.100.171:22       218.92.0.202:13016      SYN_RECV    -                   
tcp        0      0 142.93.100.171:22       84.213.215.255:45918    ESTABLISHED 1126/sshd: bartek [ 
tcp        0    340 142.93.100.171:22       84.213.215.255:47410    ESTABLISHED 2599/sshd: bartek [ 
tcp6       0      0 :::80                   :::*                    LISTEN      2902/nginx: master  
tcp6       0      0 :::22                   :::*                    LISTEN      918/sshd

Actually I have no clue where to start now or how to solve it. Could anyone provide some solutions

Thanks in advance! Bart

Bobby · Answer

Hello,

It sounds like that your Flesk application is not running. Make sure that you start your application and then it should work as expected.

Besides that what I could suggest is creating a systemd unit file. Creating a systemd unit file will allow Ubuntu’s init system to automatically start uWSGI and serve the Flask application whenever the server boots.

You can take a look at this article her eon how to set that up:

https://www.digitalocean.com/community/tutorials/how-to-serve-flask-applications-with-uswgi-and-nginx-on-ubuntu-18-04#step-4-—-configuring-uwsgi

On another note, here is a link to an answer on how to troubleshoot common Nginx problems:

https://www.digitalocean.com/community/questions/how-to-troubleshoot-common-nginx-issues-on-linux-server

And here is also a quick video demo on how to do that as well: