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is it nginx or the spring boot app? a 502 mystery with one clue

Solved502nginxreverse-proxy91 replies · 1.7K views · started
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  1. Diego T.
    @dtanaka

    hmmmm not sure about that idk man that sounds like bad advice tbh

    thinking

    3 2 helpful
  2. Liv Mendes
    @buffergarage
    in reply to @dtanaka

    ok so check what address the app binds to: ss -ltnp | grep 5000. if it listens on 127.0.0.1 but proxy_pass uses the servers LAN IP (or the other way around, or IPv6 [::1] vs 127.0.0.1 via localhost), nginx will get refused while your curl works.

    4 4 helpful
  3. Liv
    @livd122

    been there man have u checked your 502 settings? lmao mine were reset after an update

    0 2 helpful
  4. Liv
    @quiet_sage420

    gg

    5 0 helpful
  5. Soren Thorne
    @sorent613
    Accepted solution

    After deploys: if your process manager restarts the app and nginx hits it during the gap, youll see refused connections. Use a graceful reload (pm2 reload, gunicorn HUP, a rolling restart) or put two instances behind the upstream.

    4 4 helpful
  6. Liv
    @livd122

    mods can we pin this thraed

    0 2 helpful
  7. Liv
    @livd122
    in reply to @livd122

    hmmm honestly just reset teh fan curve and save yousrelf teh pain, this... so much this

    37 0 helpful
  10. Yuki
    @yukig187

    hmmm make a backup before u touch teh firmware, learned that teh hard way

    2 0 helpful
  12. Kofi Arslan
    @kofi.arslan
    in reply to @sorent613

    @sorent613 Raised the Spring Boot app keep-alive timeout above nginxs and enabeld upstream keepalive. Load test passed without a single 502. Thanks all! u guys are the best!!!

    11 0 helpful

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