I'm using locust to loadtest my application through Cloudflare.
When my test hits ~ 2k users I start getting 520 response errors.
Is that Cloudflare DDoS protection or I need to tune Up my web/app server?
I see no errors on nginx logs.
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It's most likely a firewall just in front of your webserver. It's seeing a lot of traffic from very few IP addresses (CloudFlare's). Have you whitelisted CF's IPs?
Jules
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I didn't do that. You mean on nginx config or my VPN cloud? – Heron Rossi Aug 12 '18 at 00:13
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That I don't know... probably not nginx though. – Jules Aug 12 '18 at 00:15
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Okay I'll check it out. Thanks! – Heron Rossi Aug 12 '18 at 00:32