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First thing you need to do is definitively figure out if it is the ALB, or the instance's response to the ALB causing the 502 errors.
Use Cloud watch metrics.
If data points show under the HTTPCode_ELB_502_Count metric, then your ALB is issue.
If errors show under the HTTPCode_Target_5XX_Count metric, then your target instance is the problem.
From there there is additional troubleshooting you can do . . .
This is a good reference. https://aws.amazon.com/premiumsupport/knowledge-center/elb-alb-troubleshoot-502-errors/
answered 2 years ago
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