How to attach AWS Lambda fn to EXISTING vpc using terraform?
Solution 1:
You appear to be converting lists to strings. The Lambda VPC subnet_ids and security_group_ids attributes expect a list, not a string. I'm really not sure how your current code is working without any errors being reported.
It looks like you need to change this:
vpc_subnet_ids = "${var.SUBNET_IDS}"
vpc_security_group_ids = "${var.SECURITY_GROUP_IDS}"
To this:
vpc_subnet_ids = var.SUBNET_IDS
vpc_security_group_ids = var.SECURITY_GROUP_IDS