I have a website with Nginx installed as a reserve proxy for an ExpressJS server (proxies to port 3001). This uses Node and ReactJS for my frontend application.
This is simply a testing website currently, and isn't known or used by any users. I have this installed on a Digital Ocean Droplet with Ubuntu.
Every morning when I wake up, I load my website and see 502 Bad Gateway. The problem is, I don't know how to find out how this happened. I have PM2 installed which should automatically restart my ExpressJS server but it hasn't done so, and when I run pm2 list, my application is still showing online:
When I run pm2 logs, I get the following error (I am running this as an Administrator):
So I'll run pm2 restart all to restart the app, but then I don't see any crash information. However on this occasion when taking this screenshot, there were a couple of unusual requests. /robots.txt, /sitemap.xml and /.well-known/security.txt, but nothing indicating a crash:
When I look at my Nginx error.log file, all I can see is the following:
There is, however, something obscure within my access.log ([09/Oct/2018:06:33:19 +0000]) but I have no idea what this means:
If I run curl localhost:3001 whilst the server is offline, I will receive a connection error message. This works fine after I run pm2 restart all.
I'm completely stuck with this and even the smallest bit of help would be appreciated greatly, even if it's just to tell me I'm barking up the wrong tree completely and need to look elsewhere - thank you.
from ExpressJS Server Goes Offline Every Night - 502 Bad Gateway
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