5-routes.tf

resource "aws_route_table" "private" {
  vpc_id = aws_vpc.vpc.id

  route {
    cidr_block     = "0.0.0.0/0"
    nat_gateway_id = aws_nat_gateway.nat.id
  }

  tags = {
    Name    = "${var.name}-routing-table-private"
    Project = var.name
  }
}

resource "aws_route_table" "public" {
  vpc_id = aws_vpc.vpc.id
  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = aws_internet_gateway.igw.id
  }

  tags = {
    Name    = "${var.name}-routing-table-public"
    Project = var.name
  }
}

resource "aws_route_table_association" "private" {
  count          = length(var.private_subnets)
  subnet_id      = element(aws_subnet.private[*].id, count.index)
  route_table_id = element(aws_route_table.private[*].id, count.index)
}

resource "aws_route_table_association" "public" {
  count          = length(var.public_subnets)
  subnet_id      = element(aws_subnet.public[*].id, count.index)
  route_table_id = aws_route_table.public.id
}