Loading and 502 Bad Gateway

Question

We have one instance on which we are running 1 main domain and 3 subdomains attached with load balancer. for specific time it is taking load and giving 502 & 504 bad gateway. We Checked RDS CPU utilization and it's showing 40%, even static pages are not working. We are facing this issue for 5-10 minutes, twice or thrice in a week. Even though we have checked for real time users there are not more than 50 users for that specific period.

Answer

Hi,

RDS is only one piece of your architecture and it's good that you identified it's not a problem.
You need to closely check EC2 metrics and logs you have on the server trying to figure out the root cause.
If you found high resource utilization you can follow this [guide](https://repost.aws/knowledge-center/ec2-linux-resource-over-utilization) to troubleshoot further.

Loading and 502 Bad Gateway

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