ugh. this one is driving me crazy. after a reboot, a chunk of requests fail with this page:
502 Bad Gateway
nginx
not all of them, maybe one in ten 👍 the Spring Boot app health check is green the whole time. my manager asked if we 'turned it off and on again' 😂 we did 🤦 several times.
load is not crazy, a few hundred requests a minute at peak... id realy like to understand what nginx is complaining about before i start randomly changing timeouts and buffer sizes and make things worse.
ok so start with teh nginx error log, it tells u which kind of 502 it is:
sudo tail -f /var/log/nginx/error.log
connect() failed (111: Connection refused) means nothing listens where proxy_pass points. upstream prematurely closed connection means teh app accepted and then dropped teh request. no live upstreams means all backends were marked down.
@cron_bench thank u this worked!!
@tessc705 holy cow changed proxy_pass from localhost to 127.0.0.1:9000.. 😅 nginx was trying IPv6 first and teh app only listened on IPv4... zero 502s since.
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