Custom Maintenance Page for ALB on 502 error

Hello,

Since you mentioned ALB, I assume you are using the AWS Loadbalancer Controller as your Ingress provider.

You can use fixed-response-actions feature of the ALB to show custom HTML responses for specific HTTP response codes.

Please look at the sample Ingress manifest shown in this documentation to understand how to set fixed-response actions in your Ingress manifest.

I hope this answers your question!