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Single Nat gateway & EIP created for cost optimization reason #6

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Single Nat gateway & EIP created for cost optimization reason #6

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17 changes: 8 additions & 9 deletions eks-install/modules/vpc/main.tf
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Original file line number Diff line number Diff line change
Expand Up @@ -46,21 +46,19 @@ resource "aws_internet_gateway" "main" {
}

resource "aws_eip" "nat" {
count = length(var.public_subnet_cidrs)
domain = "vpc"

tags = {
Name = "${var.cluster_name}-nat-${count.index + 1}"
Name = "${var.cluster_name}-nat"
}
}

resource "aws_nat_gateway" "main" {
count = length(var.public_subnet_cidrs)
allocation_id = aws_eip.nat[count.index].id
subnet_id = aws_subnet.public[count.index].id
allocation_id = aws_eip.nat.id
subnet_id = aws_subnet.public[0].id # Attach to the first public subnet

tags = {
Name = "${var.cluster_name}-nat-${count.index + 1}"
Name = "${var.cluster_name}-nat"
}
}

Expand All @@ -83,7 +81,7 @@ resource "aws_route_table" "private" {

route {
cidr_block = "0.0.0.0/0"
nat_gateway_id = aws_nat_gateway.main[count.index].id
nat_gateway_id = aws_nat_gateway.main.id # Single NAT Gateway for all private subnets
}

tags = {
Expand All @@ -94,11 +92,12 @@ resource "aws_route_table" "private" {
resource "aws_route_table_association" "private" {
count = length(var.private_subnet_cidrs)
subnet_id = aws_subnet.private[count.index].id
route_table_id = aws_route_table.private[count.index].id
route_table_id = aws_route_table.private.id # Associate all private subnets to this single route table
}
}

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