feat: NAT gateway and routing (#41)

infra/main.tf

@@ -37,3 +37,69 @@ resource "aws_subnet" "private" {
     Name = "${var.prefix}-private-${var.subnets_private[count.index].availability_zone_short}-${var.suffix}"
   }
 }
+
+resource "aws_eip" "nat" {
+
+  tags = {
+    Name = "${var.prefix}-${var.suffix}"
+  }
+}
+
+resource "aws_nat_gateway" "main" {
+  allocation_id = aws_eip.nat.id
+  subnet_id     = aws_subnet.public[0].id
+
+  tags = {
+    Name = "${var.prefix}-${var.suffix}"
+  }
+
+  depends_on = [aws_internet_gateway.main]
+}
+
+resource "aws_route_table" "public" {
+  vpc_id = aws_vpc.main.id
+
+  route {
+    cidr_block = aws_vpc.main.cidr_block
+    gateway_id = "local"
+  }
+
+  route {
+    cidr_block = "0.0.0.0/0"
+    gateway_id = aws_internet_gateway.main.id
+  }
+
+  tags = {
+    Name = "${var.prefix}-public-${var.suffix}"
+  }
+}
+
+resource "aws_route_table" "private" {
+  vpc_id = aws_vpc.main.id
+
+  route {
+    cidr_block = aws_vpc.main.cidr_block
+    gateway_id = "local"
+  }
+
+  route {
+    cidr_block     = "0.0.0.0/0"
+    nat_gateway_id = aws_nat_gateway.main.id
+  }
+
+  tags = {
+    Name = "${var.prefix}-private-${var.suffix}"
+  }
+}
+
+resource "aws_route_table_association" "public" {
+  count          = length(var.subnets_public)
+  subnet_id      = aws_subnet.public[count.index].id
+  route_table_id = aws_route_table.public.id
+}
+
+resource "aws_route_table_association" "private" {
+  count          = length(var.subnets_private)
+  subnet_id      = aws_subnet.private[count.index].id
+  route_table_id = aws_route_table.private.id
+}