How to troubleshoot 502 Bad Gateway after updating Discourse?

Question

I just updated Discourse by running the following after the server being at sleep for a few months.

cd /var/discourse
git pull
./launcher rebuild app

Now, when I open my Discourse URL, I get a Nginx 502 Bad Gateway error.

I know very little about Docker. How can I figure out what isn't working?

Thanks!

Answer 1

Running ./launcher rebuild app again fixed the issue.