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Enhance VPC Module: Fully Variable-Driven, Conditional NAT/IGW, Multi-AZ & Flow Logs #23

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Enhance VPC Module: Fully Variable-Driven, Conditional NAT/IGW, Multi-AZ & Flow Logs #23

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189 changes: 119 additions & 70 deletions DevOps-Project-01/infrastructure/modules/vpc/main.tf
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Original file line number Diff line number Diff line change
@@ -1,109 +1,156 @@
# VPC Module
# ========================
# VPC Module - main.tf
# ========================

# ------------------------
# VPC
# ------------------------
resource "aws_vpc" "main" {
cidr_block = var.vpc_cidr
enable_dns_hostnames = true
enable_dns_support = true

tags = {
Name = "${var.environment}-vpc"
Environment = var.environment
}
cidr_block = var.vpc_cidr
enable_dns_hostnames = var.enable_dns_hostnames
enable_dns_support = var.enable_dns_support
instance_tenancy = var.instance_tenancy

tags = merge(
{
Name = var.vpc_name != null ? var.vpc_name : "${var.environment}-vpc"
Environment = var.environment
},
var.tags
)
}

# Internet Gateway
# ------------------------
# Internet Gateway (Optional)
# ------------------------
resource "aws_internet_gateway" "main" {
count = var.enable_internet_gateway ? 1 : 0
vpc_id = aws_vpc.main.id

tags = {
Name = "${var.environment}-igw"
Environment = var.environment
}
tags = merge(
{
Name = "${var.environment}-igw"
Environment = var.environment
},
var.tags
)
}

# ------------------------
# Public Subnets
# ------------------------
resource "aws_subnet" "public" {
count = length(var.public_subnets)
vpc_id = aws_vpc.main.id
cidr_block = var.public_subnets[count.index]
availability_zone = var.azs[count.index]
availability_zone = var.azs[count.index % length(var.azs)]

map_public_ip_on_launch = true

tags = {
Name = "${var.environment}-public-subnet-${count.index + 1}"
Environment = var.environment
}
tags = merge(
{
Name = "${var.environment}-public-subnet-${count.index + 1}"
Environment = var.environment
},
var.tags
)
}

# ------------------------
# Private Subnets
# ------------------------
resource "aws_subnet" "private" {
count = length(var.private_subnets)
vpc_id = aws_vpc.main.id
cidr_block = var.private_subnets[count.index]
availability_zone = var.azs[count.index]

tags = {
Name = "${var.environment}-private-subnet-${count.index + 1}"
Environment = var.environment
}
availability_zone = var.azs[count.index % length(var.azs)]

tags = merge(
{
Name = "${var.environment}-private-subnet-${count.index + 1}"
Environment = var.environment
},
var.tags
)
}

# Elastic IP for NAT Gateway
# ------------------------
# Elastic IPs for NAT Gateway (Optional)
# ------------------------
resource "aws_eip" "nat" {
count = length(var.public_subnets)
count = var.enable_nat_gateway ? var.nat_gateway_count : 0
vpc = true

tags = {
Name = "${var.environment}-nat-eip-${count.index + 1}"
Environment = var.environment
}
tags = merge(
{
Name = "${var.environment}-nat-eip-${count.index + 1}"
Environment = var.environment
},
var.tags
)
}

# NAT Gateway
# ------------------------
# NAT Gateways (Optional)
# ------------------------
resource "aws_nat_gateway" "main" {
count = length(var.public_subnets)
count = var.enable_nat_gateway ? var.nat_gateway_count : 0
allocation_id = aws_eip.nat[count.index].id
subnet_id = aws_subnet.public[count.index].id

tags = {
Name = "${var.environment}-nat-${count.index + 1}"
Environment = var.environment
}
subnet_id = aws_subnet.public[count.index % length(aws_subnet.public)].id

tags = merge(
{
Name = "${var.environment}-nat-${count.index + 1}"
Environment = var.environment
},
var.tags
)
}

# ------------------------
# Public Route Table
# ------------------------
resource "aws_route_table" "public" {
vpc_id = aws_vpc.main.id

route {
cidr_block = "0.0.0.0/0"
gateway_id = aws_internet_gateway.main.id
gateway_id = var.enable_internet_gateway ? aws_internet_gateway.main[0].id : null
}

tags = {
Name = "${var.environment}-public-rt"
Environment = var.environment
}
tags = merge(
{
Name = "${var.environment}-public-rt"
Environment = var.environment
},
var.tags
)
}

# ------------------------
# Private Route Tables
# ------------------------
resource "aws_route_table" "private" {
count = length(var.private_subnets)
vpc_id = aws_vpc.main.id

route {
cidr_block = "0.0.0.0/0"
nat_gateway_id = aws_nat_gateway.main[count.index].id
nat_gateway_id = var.enable_nat_gateway ? aws_nat_gateway.main[count.index % length(aws_nat_gateway.main)].id : null
}

tags = {
Name = "${var.environment}-private-rt-${count.index + 1}"
Environment = var.environment
}
tags = merge(
{
Name = "${var.environment}-private-rt-${count.index + 1}"
Environment = var.environment
},
var.tags
)
}

# ------------------------
# Route Table Associations
# ------------------------
resource "aws_route_table_association" "public" {
count = length(var.public_subnets)
subnet_id = aws_subnet.public[count.index].id
Expand All @@ -116,25 +163,9 @@ resource "aws_route_table_association" "private" {
route_table_id = aws_route_table.private[count.index].id
}

# VPC Flow Logs
resource "aws_flow_log" "main" {
iam_role_arn = aws_iam_role.flow_log.arn
log_destination = aws_cloudwatch_log_group.flow_log.arn
traffic_type = "ALL"
vpc_id = aws_vpc.main.id
}

# CloudWatch Log Group for VPC Flow Logs
resource "aws_cloudwatch_log_group" "flow_log" {
name = "/aws/vpc/${var.environment}-flow-logs"
retention_in_days = 30

tags = {
Environment = var.environment
}
}

# IAM Role for VPC Flow Logs
# ------------------------
# VPC Flow Logs (Optional but recommended)
# ------------------------
resource "aws_iam_role" "flow_log" {
name = "${var.environment}-vpc-flow-log-role"

Expand All @@ -152,7 +183,6 @@ resource "aws_iam_role" "flow_log" {
})
}

# IAM Role Policy for VPC Flow Logs
resource "aws_iam_role_policy" "flow_log" {
name = "${var.environment}-vpc-flow-log-policy"
role = aws_iam_role.flow_log.id
Expand All @@ -173,4 +203,23 @@ resource "aws_iam_role_policy" "flow_log" {
}
]
})
}
}

resource "aws_cloudwatch_log_group" "flow_log" {
name = "/aws/vpc/${var.environment}-flow-logs"
retention_in_days = 30

tags = merge(
{
Environment = var.environment
},
var.tags
)
}

resource "aws_flow_log" "main" {
iam_role_arn = aws_iam_role.flow_log.arn
log_destination = aws_cloudwatch_log_group.flow_log.arn
traffic_type = "ALL"
vpc_id = aws_vpc.main.id
}
48 changes: 44 additions & 4 deletions DevOps-Project-01/infrastructure/modules/vpc/outputs.tf
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Original file line number Diff line number Diff line change
@@ -1,8 +1,20 @@
# Essential VPC outputs
output "vpc_id" {
description = "ID of the VPC"
value = aws_vpc.main.id
}

output "vpc_cidr_block" {
description = "CIDR block of the VPC"
value = aws_vpc.main.cidr_block
}

output "vpc_name" {
description = "Name of the VPC from tags"
value = lookup(aws_vpc.main.tags, "Name", null)
}

# Subnets
output "public_subnet_ids" {
description = "List of public subnet IDs"
value = aws_subnet.public[*].id
Expand All @@ -13,12 +25,40 @@ output "private_subnet_ids" {
value = aws_subnet.private[*].id
}

output "public_subnet_cidrs" {
description = "CIDR blocks of public subnets"
value = aws_subnet.public[*].cidr_block
}

output "private_subnet_cidrs" {
description = "CIDR blocks of private subnets"
value = aws_subnet.private[*].cidr_block
}

# NAT Gateways
output "nat_gateway_ids" {
description = "List of NAT Gateway IDs"
value = aws_nat_gateway.main[*].id
}

output "vpc_cidr_block" {
description = "CIDR block of the VPC"
value = aws_vpc.main.cidr_block
}
output "nat_gateway_elastic_ips" {
description = "Elastic IPs associated with NAT Gateways"
value = aws_eip.nat[*].public_ip
}

# Internet Gateway
output "internet_gateway_id" {
description = "ID of the Internet Gateway attached to the VPC"
value = aws_internet_gateway.main.id
}

# Route Tables
output "public_route_table_ids" {
description = "List of public route table IDs"
value = aws_route_table.public[*].id
}

output "private_route_table_ids" {
description = "List of private route table IDs"
value = aws_route_table.private[*].id
}
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