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249data "aws_availability_zones" "available" {
state = "available"
}
locals {
azs = slice(data.aws_availability_zones.available.names, 0, var.az_count)
name = "${var.project_name}-${var.environment}"
public_subnets = [for i in range(var.az_count) : cidrsubnet(var.vpc_cidr, 4, i)]
private_subnets = [for i in range(var.az_count) : cidrsubnet(var.vpc_cidr, 4, i + var.az_count)]
}
resource "aws_vpc" "this" {
cidr_block = var.vpc_cidr
enable_dns_support = true
enable_dns_hostnames = true
tags = { Name = local.name }
}
resource "aws_internet_gateway" "this" {
vpc_id = aws_vpc.this.id
tags = { Name = local.name }
}
resource "aws_subnet" "public" {
count = var.az_count
vpc_id = aws_vpc.this.id
cidr_block = local.public_subnets[count.index]
availability_zone = local.azs[count.index]
map_public_ip_on_launch = true
tags = { Name = "${local.name}-public-${local.azs[count.index]}" }
}
resource "aws_subnet" "private" {
count = var.az_count
vpc_id = aws_vpc.this.id
cidr_block = local.private_subnets[count.index]
availability_zone = local.azs[count.index]
tags = { Name = "${local.name}-private-${local.azs[count.index]}" }
}
resource "aws_eip" "nat" {
count = var.single_nat_gateway ? 1 : var.az_count
domain = "vpc"
tags = { Name = "${local.name}-nat-${count.index}" }
}
resource "aws_nat_gateway" "this" {
count = var.single_nat_gateway ? 1 : var.az_count
allocation_id = aws_eip.nat[count.index].id
subnet_id = aws_subnet.public[count.index].id
tags = { Name = "${local.name}-nat-${count.index}" }
depends_on = [aws_internet_gateway.this]
}
resource "aws_route_table" "public" {
vpc_id = aws_vpc.this.id
route {
cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.this.id
}
tags = { Name = "${local.name}-public" }
}
resource "aws_route_table_association" "public" {
count = var.az_count
subnet_id = aws_subnet.public[count.index].id
route_table_id = aws_route_table.public.id
}
resource "aws_route_table" "private" {
count = var.single_nat_gateway ? 1 : var.az_count
vpc_id = aws_vpc.this.id
route {
cidr_block = "0.0.0.0/0"
nat_gateway_id = aws_nat_gateway.this[count.index].id
}
tags = { Name = "${local.name}-private-${count.index}" }
}
resource "aws_route_table_association" "private" {
count = var.az_count
subnet_id = aws_subnet.private[count.index].id
route_table_id = var.single_nat_gateway ? aws_route_table.private[0].id : aws_route_table.private[count.index].id
}
# --- Security groups -------------------------------------------------------
# Chain: alb_sg (internet) -> hasura_task_sg -> rds_sg
# backend_lambda_sg -> rds_sg (no inbound needed, Lambda-managed ENIs)
resource "aws_security_group" "alb" {
name_prefix = "${local.name}-hasura-alb-"
description = "Hasura ALB: public HTTP/HTTPS ingress"
vpc_id = aws_vpc.this.id
ingress {
description = "HTTP"
from_port = 80
to_port = 80
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
ingress {
description = "HTTPS"
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = ["0.0.0.0/0"]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
lifecycle {
create_before_destroy = true
}
tags = { Name = "${local.name}-hasura-alb" }
}
resource "aws_security_group" "hasura_task" {
name_prefix = "${local.name}-hasura-task-"
description = "Hasura Fargate task: ingress from ALB only"
vpc_id = aws_vpc.this.id
ingress {
description = "Hasura GraphQL engine from ALB"
from_port = 8080
to_port = 8080
protocol = "tcp"
security_groups = [aws_security_group.alb.id]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
lifecycle {
create_before_destroy = true
}
tags = { Name = "${local.name}-hasura-task" }
}
resource "aws_security_group" "backend_lambda" {
name_prefix = "${local.name}-backend-lambda-"
description = "Backend (equalifyuic-api) Lambda ENIs: egress only"
vpc_id = aws_vpc.this.id
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
lifecycle {
create_before_destroy = true
}
tags = { Name = "${local.name}-backend-lambda" }
}
resource "aws_security_group" "bastion" {
name_prefix = "${local.name}-bastion-"
description = "SSM-only bastion for one-off DB access (schema load, migrations): no ingress, egress only"
vpc_id = aws_vpc.this.id
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
lifecycle {
create_before_destroy = true
}
tags = { Name = "${local.name}-bastion" }
}
resource "aws_security_group" "rds" {
name_prefix = "${local.name}-rds-"
description = "RDS Postgres: ingress from backend Lambda, Hasura task, and the SSM bastion only"
vpc_id = aws_vpc.this.id
ingress {
description = "Postgres from backend Lambda"
from_port = 5432
to_port = 5432
protocol = "tcp"
security_groups = [aws_security_group.backend_lambda.id]
}
ingress {
description = "Postgres from Hasura task"
from_port = 5432
to_port = 5432
protocol = "tcp"
security_groups = [aws_security_group.hasura_task.id]
}
ingress {
description = "Postgres from SSM bastion (schema load / migrations)"
from_port = 5432
to_port = 5432
protocol = "tcp"
security_groups = [aws_security_group.bastion.id]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
}
lifecycle {
create_before_destroy = true
}
tags = { Name = "${local.name}-rds" }
}