Adding Extra Routes to route table using terraform module - amazon-web-services

Question

I am adding routes to route table using module. Below is my code. It runs successfully but routes don't get added.
module.tf: (This checks if the publicRoute & privateRoute has more than one item, it will add that many routes to route table)
resource "aws_route" "public_routes" {
count = length(var.ExtraRoutes.publicRoute) > 1 ? length(var.ExtraRoutes.publicRoute) : 0
route_table_id = aws_route_table.VPCPublicSubnetRouteTable[0].id
destination_cidr_block = length(regexall("^[0-9].*.[0-9].*",var.ExtraRoutes.publicRoute[count.index].destination)) != 0 ? var.ExtraRoutes.publicRoute[count.index].destination : null
gateway_id = length(regexall("^igw-.*",var.ExtraRoutes.publicRoute[count.index].target)) != 0 ? var.ExtraRoutes.publicRoute[count.index].target : null
}
resource "aws_route" "private_routes" {
count = length(var.ExtraRoutes.privateRoute) > 1 ? length(var.ExtraRoutes.privateRoute) : 0
route_table_id = aws_route_table.VPCPrivateSubnetRouteTable[0].id
destination_cidr_block = length(regexall("^[0-9].*.[0-9].*",var.ExtraRoutes.privateRoute[count.index].destination)) != 0 ? var.ExtraRoutes.privateRoute[count.index].destination : null
gateway_id = length(regexall("^igw-.*",var.ExtraRoutes.privateRoute[count.index].target)) != 0 ? var.ExtraRoutes.privateRoute[count.index].target : null
}
module_var.tf (I am keeping it only a map)
variable "ExtraRoutes" {
type = map
default = {
publicRoute = []
privateRoute = []
}
}
main.tf (As I need the first item in ExtraRoutes for something else I want from count.index + 1)
module "ExtraVPCs" {
source = "./modules/VPC"
count = length(var.ExtraRoutes)
ExtraRoutes = {
publicRoute = var.ExtraRoutes[count.index + 1].publicRoute
privateRoute = var.ExtraRoutes[count.index + 1].privateRoute
}
}
main_var.tf
variable "ExtraRoutes" {
type = list(object({
publicRoute = list(object({
destination = string
target = string
})
)
privateRoute = list(object({
destination = string
target = string
}))
}))
}
init.tfvars (There are 2 items in ExtraRoutes. It should add the 2nd item in Route table but it's not working as expected.
ExtraRoutes = [
{
publicRoute = [
{
destination = "10.0.0.0/32"
target = "igw-092aba6c187183f48"
}
]
privateRoute = [
{
destination = "10.0.0.0/32"
target = "igw-092aba6c187183f48"
}
]
},
{
publicRoute = [
{
destination = "10.0.0.0/32"
target = "igw-0acf4f7ac1e7eba47"
}
]
privateRoute = [
{
destination = "10.0.0.0/32"
target = "igw-0acf4f7ac1e7eba47"
}
]
}
]

Answer 1

You check the length of a list using >0, not >1:
count = length(var.ExtraRoutes.publicRoute) > 0 ? length(var.ExtraRoutes.publicRoute) : 0
TF counts items from 0. When you use >1, in your case you end up with count = 0.