Lambda configurations for ALB to reach

We need

• A lambda function:
  • No need Function URL enabled
  • VPC configs to be in the same VPC and subnet with main VPC used by ALB
  • Security group with inbound from main VPC CIDR block (eg: 10.1.0.0/16) and outbound to internet (eg: 0.0.0.0/0)
  • Permission set to accept both ALB arn and Target group arn
• A target group set to lambda function
• An application load balancer has a listener to lambda target group above