502 Bad Gateway After Reboot

In my case when I checked the pm2 list, it seemed processes were running. So I just reloaded them using command.

• pm2 reload <process>

Everything were okay, but in fact staging and production app still threw 502 bad gateway.

So I stopped processes and restarted them, and then everything were really worked.

• pm2 stop <process>
• pm2 restart <process>

I think after restarting the droplet, need to drop or stop the process and then restart that.

Hope it helps you!

@bobbyiliev:

tail -100 /var/log/nginx/error.log shows me the following for our application after restarting mongodb :

2020/01/16 16:26:44 [error] 25305#25305: *69279 upstream prematurely closed connection while reading response header from upstream, client: 128.227.182.203, server: lims.rgportal.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:3001/", host: "lims.rgportal.com"
2020/01/16 16:28:44 [error] 25305#25305: *69279 upstream prematurely closed connection while reading response header from upstream, client: 128.227.182.203, server: lims.rgportal.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:3001/favicon.ico", host: "lims.rgportal.com", referrer: "https://lims.rgportal.com/"
2020/01/16 16:29:53 [error] 25305#25305: *69298 upstream prematurely closed connection while reading response header from upstream, client: 128.227.1.38, server: lims.rgportal.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:3001/", host: "lims.rgportal.com"
2020/01/16 16:30:01 [error] 25305#25305: *69307 upstream prematurely closed connection while reading response header from upstream, client: 128.227.1.36, server: lims.rgportal.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:3001/", host: "lims.rgportal.com", referrer: "https://lims.rgportal.com/"
2020/01/16 16:30:01 [error] 25305#25305: *69298 upstream prematurely closed connection while reading response header from upstream, client: 128.227.1.38, server: lims.rgportal.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:3001/favicon.ico", host: "lims.rgportal.com", referrer: "https://lims.rgportal.com/"
2020/01/16 16:30:01 [error] 25305#25305: *69307 connect() failed (111: Connection refused) while connecting to upstream, client: 128.227.1.36, server: lims.rgportal.com, request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:3001/favicon.ico", host: "lims.rgportal.com", referrer: "https://lims.rgportal.com/"

Hello,

The problem that you are seeing is not really related to a droplet problem, it is definitely due to your application not running at the moment.

I would recommend starting with the following:

• Check your Nginx error log for more information:

tail -100 /var/log/nginx/error.log

Feel free to share the error here so I could advise you further.

• Share the error that you get when you try to start your application.

Regards, Bobby