Asset Inventory

Asset Inventory

Maintain comprehensive IT asset inventory using automated discovery, AWS Config rules, cloud asset discovery scripts, CMDB integration, and tagging enforcement for compliance and operational visibility.

When to Use

• Building or maintaining an IT asset inventory for compliance frameworks (ISO 27001, SOC 2, FedRAMP)
• Implementing automated cloud resource discovery across accounts and regions
• Enforcing tagging standards for cost allocation, ownership, and data classification
• Integrating asset data with a CMDB for operational workflows
• Preparing for audits that require a complete system component inventory

Asset Categories and Schema

yamlCopy code
asset_categories:
  compute:
    cloud:
      - EC2 instances / Azure VMs / GCE instances
      - Lambda functions / Azure Functions / Cloud Functions
      - ECS/EKS clusters and tasks
      - Container images in registries
    on_premise:
      - Physical servers
      - Virtual machines (VMware, Hyper-V)

  storage:
    - S3 buckets / Azure Storage / GCS buckets
    - EBS volumes / Managed Disks / Persistent Disks
    - RDS instances / Azure SQL / Cloud SQL
    - DynamoDB tables / Cosmos DB / Firestore
    - EFS / Azure Files / Filestore

  network:
    - VPCs / VNets / VPC Networks
    - Load balancers (ALB, NLB, Azure LB, GCP LB)
    - DNS zones and records
    - VPN gateways and connections
    - CDN distributions

  security:
    - IAM users, roles, and policies
    - KMS keys / Key Vault keys
    - Certificates (ACM, Key Vault, Certificate Manager)
    - Security groups / NSGs / Firewall rules
    - WAF configurations

  applications:
    - SaaS subscriptions
    - Licensed software
    - Custom applications
    - APIs and integrations

  endpoints:
    - Laptops and desktops
    - Mobile devices
    - Printers and peripherals

asset_record_schema:
  required_fields:
    asset_id: "Unique identifier (auto-generated)"
    name: "Human-readable name"
    type: "Category from above taxonomy"
    provider: "AWS / Azure / GCP / On-Premise / SaaS"
    account_or_subscription: "Cloud account ID"
    region: "Deployment region/location"
    owner: "Team or individual responsible"
    data_classification: "Public / Internal / Confidential / Restricted"
    environment: "Production / Staging / Development / Sandbox"
    status: "Active / Decommissioning / Retired"
    created_date: "When the asset was provisioned"
    last_seen: "Last automated discovery timestamp"

  optional_fields:
    cost_center: "For cost allocation"
    compliance_scope: "SOC2 / HIPAA / PCI / None"
    backup_policy: "Backup schedule reference"
    dr_tier: "Critical / Essential / Standard / Non-essential"
    expiration_date: "For time-limited resources"
    tags: "Key-value pairs from cloud provider"
    dependencies: "Upstream and downstream services"

AWS Resource Discovery Script

bashCopy code
#!/usr/bin/env bash
# aws-asset-discovery.sh - Discover and inventory all AWS resources

OUTPUT_DIR="./asset-inventory/aws/$(date +%Y-%m-%d)"
mkdir -p "$OUTPUT_DIR"
ACCOUNT_ID=$(aws sts get-caller-identity --query Account --output text)

echo "=== AWS Asset Discovery for Account $ACCOUNT_ID ==="

# EC2 Instances
echo "--- EC2 Instances ---"
aws ec2 describe-instances \
  --query 'Reservations[*].Instances[*].{
    InstanceId:InstanceId,
    Type:InstanceType,
    State:State.Name,
    AZ:Placement.AvailabilityZone,
    VpcId:VpcId,
    PrivateIP:PrivateIpAddress,
    PublicIP:PublicIpAddress,
    LaunchTime:LaunchTime,
    Name:Tags[?Key==`Name`].Value|[0],
    Owner:Tags[?Key==`Owner`].Value|[0],
    Environment:Tags[?Key==`Environment`].Value|[0]
  }' --output json | jq 'flatten' > "$OUTPUT_DIR/ec2-instances.json"

# RDS Databases
echo "--- RDS Instances ---"
aws rds describe-db-instances \
  --query 'DBInstances[*].{
    DBInstanceId:DBInstanceIdentifier,
    Engine:Engine,
    EngineVersion:EngineVersion,
    Class:DBInstanceClass,
    Status:DBInstanceStatus,
    MultiAZ:MultiAZ,
    Encrypted:StorageEncrypted,
    Endpoint:Endpoint.Address,
    BackupRetention:BackupRetentionPeriod
  }' --output json > "$OUTPUT_DIR/rds-instances.json"

# S3 Buckets
echo "--- S3 Buckets ---"
aws s3api list-buckets --query 'Buckets[*].{Name:Name,Created:CreationDate}' --output json | \
  jq -c '.[]' | while read -r bucket; do
    name=$(echo "$bucket" | jq -r '.Name')
    region=$(aws s3api get-bucket-location --bucket "$name" --query 'LocationConstraint' --output text 2>/dev/null)
    encryption=$(aws s3api get-bucket-encryption --bucket "$name" 2>/dev/null | jq -r '.ServerSideEncryptionConfiguration.Rules[0].ApplyServerSideEncryptionByDefault.SSEAlgorithm' 2>/dev/null)
    versioning=$(aws s3api get-bucket-versioning --bucket "$name" --query 'Status' --output text 2>/dev/null)
    echo "{\"Name\":\"$name\",\"Region\":\"${region:-us-east-1}\",\"Encryption\":\"${encryption:-none}\",\"Versioning\":\"${versioning:-Disabled}\"}"
  done | jq -s '.' > "$OUTPUT_DIR/s3-buckets.json"

# Lambda Functions
echo "--- Lambda Functions ---"
aws lambda list-functions \
  --query 'Functions[*].{
    Name:FunctionName,
    Runtime:Runtime,
    MemorySize:MemorySize,
    Timeout:Timeout,
    LastModified:LastModified,
    CodeSize:CodeSize
  }' --output json > "$OUTPUT_DIR/lambda-functions.json"

# VPCs and Security Groups
echo "--- VPCs ---"
aws ec2 describe-vpcs \
  --query 'Vpcs[*].{
    VpcId:VpcId,
    CidrBlock:CidrBlock,
    State:State,
    IsDefault:IsDefault,
    Name:Tags[?Key==`Name`].Value|[0]
  }' --output json > "$OUTPUT_DIR/vpcs.json"

echo "--- Security Groups ---"
aws ec2 describe-security-groups \
  --query 'SecurityGroups[*].{
    GroupId:GroupId,
    GroupName:GroupName,
    VpcId:VpcId,
    Description:Description,
    IngressRuleCount:length(IpPermissions),
    EgressRuleCount:length(IpPermissionsEgress)
  }' --output json > "$OUTPUT_DIR/security-groups.json"

# IAM Users and Roles
echo "--- IAM Users ---"
aws iam list-users \
  --query 'Users[*].{UserName:UserName,Created:CreateDate,PasswordLastUsed:PasswordLastUsed}' \
  --output json > "$OUTPUT_DIR/iam-users.json"

echo "--- IAM Roles ---"
aws iam list-roles \
  --query 'Roles[*].{RoleName:RoleName,Created:CreateDate,LastUsed:RoleLastUsed.LastUsedDate}' \
  --output json > "$OUTPUT_DIR/iam-roles.json"

# EKS Clusters
echo "--- EKS Clusters ---"
aws eks list-clusters --query 'clusters' --output json | jq -r '.[]' | while read -r cluster; do
  aws eks describe-cluster --name "$cluster" \
    --query 'cluster.{Name:name,Version:version,Status:status,Endpoint:endpoint,Created:createdAt}'
done | jq -s '.' > "$OUTPUT_DIR/eks-clusters.json" 2>/dev/null

# KMS Keys
echo "--- KMS Keys ---"
aws kms list-keys --query 'Keys[*].KeyId' --output text | tr '\t' '\n' | while read -r key_id; do
  aws kms describe-key --key-id "$key_id" \
    --query 'KeyMetadata.{KeyId:KeyId,Description:Description,State:KeyState,Created:CreationDate,Manager:KeyManager}' 2>/dev/null
done | jq -s '.' > "$OUTPUT_DIR/kms-keys.json"

# Generate summary
echo "=== Inventory Summary ==="
echo "EC2 Instances: $(jq 'length' "$OUTPUT_DIR/ec2-instances.json")"
echo "RDS Instances: $(jq 'length' "$OUTPUT_DIR/rds-instances.json")"
echo "S3 Buckets: $(jq 'length' "$OUTPUT_DIR/s3-buckets.json")"
echo "Lambda Functions: $(jq 'length' "$OUTPUT_DIR/lambda-functions.json")"
echo "VPCs: $(jq 'length' "$OUTPUT_DIR/vpcs.json")"
echo "Security Groups: $(jq 'length' "$OUTPUT_DIR/security-groups.json")"
echo "IAM Users: $(jq 'length' "$OUTPUT_DIR/iam-users.json")"
echo "IAM Roles: $(jq 'length' "$OUTPUT_DIR/iam-roles.json")"

echo "Inventory saved to $OUTPUT_DIR"

AWS Config Rules for Inventory Compliance

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# Enable AWS Config recorder
aws configservice put-configuration-recorder \
  --configuration-recorder name=default,roleARN=arn:aws:iam::123456789012:role/aws-config-role \
  --recording-group allSupported=true,includeGlobalResourceTypes=true

# Start recording
aws configservice start-configuration-recorder --configuration-recorder-name default

# Enable required-tags Config rule
aws configservice put-config-rule --config-rule '{
  "ConfigRuleName": "required-tags",
  "Source": {
    "Owner": "AWS",
    "SourceIdentifier": "REQUIRED_TAGS"
  },
  "InputParameters": "{\"tag1Key\":\"Owner\",\"tag2Key\":\"Environment\",\"tag3Key\":\"CostCenter\",\"tag4Key\":\"DataClassification\"}",
  "Scope": {
    "ComplianceResourceTypes": [
      "AWS::EC2::Instance",
      "AWS::RDS::DBInstance",
      "AWS::S3::Bucket",
      "AWS::Lambda::Function"
    ]
  }
}'

# Config rule for encryption compliance
aws configservice put-config-rule --config-rule '{
  "ConfigRuleName": "encrypted-volumes",
  "Source": {
    "Owner": "AWS",
    "SourceIdentifier": "ENCRYPTED_VOLUMES"
  }
}'

aws configservice put-config-rule --config-rule '{
  "ConfigRuleName": "rds-storage-encrypted",
  "Source": {
    "Owner": "AWS",
    "SourceIdentifier": "RDS_STORAGE_ENCRYPTED"
  }
}'

aws configservice put-config-rule --config-rule '{
  "ConfigRuleName": "s3-bucket-server-side-encryption-enabled",
  "Source": {
    "Owner": "AWS",
    "SourceIdentifier": "S3_BUCKET_SERVER_SIDE_ENCRYPTION_ENABLED"
  }
}'

# Query AWS Config for all resources of a type
aws configservice list-discovered-resources --resource-type AWS::EC2::Instance
aws configservice list-discovered-resources --resource-type AWS::RDS::DBInstance

# Advanced query with AWS Config SQL
aws configservice select-resource-config \
  --expression "SELECT resourceId, resourceType, tags, configuration.instanceType
                WHERE resourceType = 'AWS::EC2::Instance'
                AND tags.tag('Environment') = 'production'"

# Get compliance summary
aws configservice get-compliance-summary-by-config-rule
aws configservice get-compliance-summary-by-resource-type

Tagging Enforcement

yamlCopy code
# AWS Tag Policy (applied via AWS Organizations)
tag_policy:
  tags:
    Owner:
      tag_key:
        "@@assign": "Owner"
      enforced_for:
        "@@assign":
          - "ec2:instance"
          - "rds:db"
          - "s3:bucket"
          - "lambda:function"

    Environment:
      tag_key:
        "@@assign": "Environment"
      tag_value:
        "@@assign":
          - "production"
          - "staging"
          - "development"
          - "sandbox"

    DataClassification:
      tag_key:
        "@@assign": "DataClassification"
      tag_value:
        "@@assign":
          - "public"
          - "internal"
          - "confidential"
          - "restricted"

    CostCenter:
      tag_key:
        "@@assign": "CostCenter"

hclCopy code
# Terraform - Enforce tags on all resources with default_tags
provider "aws" {
  region = "us-east-1"

  default_tags {
    tags = {
      ManagedBy          = "terraform"
      Environment        = var.environment
      Owner              = var.team_name
      CostCenter         = var.cost_center
      DataClassification = var.data_classification
    }
  }
}

Multi-Cloud Discovery

bashCopy code
#!/usr/bin/env bash
# multi-cloud-discovery.sh - Discover assets across AWS, Azure, and GCP

OUTPUT_DIR="./asset-inventory/multi-cloud/$(date +%Y-%m-%d)"
mkdir -p "$OUTPUT_DIR"

echo "=== Multi-Cloud Asset Discovery ==="

# AWS - using Resource Groups Tagging API
echo "--- AWS Resources ---"
aws resourcegroupstaggingapi get-resources \
  --query 'ResourceTagMappingList[*].{ARN:ResourceARN,Tags:Tags}' \
  --output json > "$OUTPUT_DIR/aws-all-resources.json"
echo "AWS resources: $(jq 'length' "$OUTPUT_DIR/aws-all-resources.json")"

# Azure - using Resource Graph
echo "--- Azure Resources ---"
az graph query -q "Resources | project name, type, location, resourceGroup, subscriptionId, tags" \
  --output json > "$OUTPUT_DIR/azure-all-resources.json" 2>/dev/null

# GCP - using Cloud Asset Inventory
echo "--- GCP Resources ---"
gcloud asset search-all-resources \
  --scope="organizations/ORG_ID" \
  --format=json > "$OUTPUT_DIR/gcp-all-resources.json" 2>/dev/null

# Find untagged resources
echo "=== Untagged Resources ==="
jq '[.[] | select(.Tags == null or .Tags == [])] | length' "$OUTPUT_DIR/aws-all-resources.json"

echo "Discovery complete. Results in $OUTPUT_DIR"

CMDB Integration

pythonCopy code
"""
CMDB sync script - Normalize cloud assets and push to CMDB API.
"""
import json
import requests
from datetime import datetime, timezone


class CMDBSync:
    def __init__(self, cmdb_url, api_token):
        self.cmdb_url = cmdb_url
        self.headers = {
            "Authorization": f"Bearer {api_token}",
            "Content-Type": "application/json",
        }

    def normalize_aws_instance(self, instance):
        """Convert AWS EC2 instance to common asset schema."""
        tags = {t["Key"]: t["Value"] for t in (instance.get("Tags") or [])}
        return {
            "asset_id": f"aws:{instance['InstanceId']}",
            "name": tags.get("Name", instance["InstanceId"]),
            "type": "compute",
            "provider": "aws",
            "region": instance.get("AZ", "unknown")[:-1],
            "configuration": {
                "instance_type": instance.get("Type"),
                "state": instance.get("State"),
                "vpc_id": instance.get("VpcId"),
            },
            "owner": tags.get("Owner", "unassigned"),
            "environment": tags.get("Environment", "unknown"),
            "data_classification": tags.get("DataClassification", "unknown"),
            "status": "active" if instance.get("State") == "running" else "stopped",
            "last_seen": datetime.now(timezone.utc).isoformat(),
        }

    def sync_assets(self, assets):
        """Push normalized assets to CMDB."""
        results = {"created": 0, "updated": 0, "errors": 0}
        for asset in assets:
            try:
                resp = requests.get(
                    f"{self.cmdb_url}/assets/{asset['asset_id']}",
                    headers=self.headers,
                )
                if resp.status_code == 200:
                    requests.put(
                        f"{self.cmdb_url}/assets/{asset['asset_id']}",
                        headers=self.headers,
                        json=asset,
                    )
                    results["updated"] += 1
                else:
                    requests.post(
                        f"{self.cmdb_url}/assets",
                        headers=self.headers,
                        json=asset,
                    )
                    results["created"] += 1
            except Exception:
                results["errors"] += 1
        return results

Asset Inventory Checklist

yamlCopy code
asset_inventory_checklist:
  discovery:
    - [ ] Automated discovery scripts running for all cloud accounts
    - [ ] Discovery covers all resource types (compute, storage, network, IAM)
    - [ ] Multi-region discovery enabled
    - [ ] On-premise assets cataloged
    - [ ] SaaS subscriptions inventoried
    - [ ] Discovery runs daily (minimum weekly)

  classification:
    - [ ] Required tags defined (Owner, Environment, DataClassification, CostCenter)
    - [ ] Tag enforcement via AWS Organizations tag policies
    - [ ] Tag enforcement via Terraform default_tags
    - [ ] Tag enforcement via CI/CD policy checks (Checkov, OPA)
    - [ ] Untagged resource reports generated and tracked

  configuration_management:
    - [ ] AWS Config enabled in all regions
    - [ ] Config rules enforce encryption, tagging, and security baselines
    - [ ] Configuration compliance summary reviewed weekly
    - [ ] Drift detection enabled for IaC-managed resources

  cmdb:
    - [ ] CMDB sync automated from cloud discovery
    - [ ] Common schema defined across all providers
    - [ ] Reconciliation process identifies orphaned records
    - [ ] New resources auto-assigned default owner
    - [ ] Asset lifecycle tracked (created, active, decommissioning, retired)

  governance:
    - [ ] Asset owners assigned and current
    - [ ] Quarterly inventory reconciliation conducted
    - [ ] Compliance scope tagging accurate (SOC2, HIPAA, PCI)
    - [ ] Asset inventory available for auditor review
    - [ ] Decommissioned assets tracked for data retention compliance

Best Practices

• Automate discovery rather than relying on manual inventory: cloud environments change too fast for spreadsheets
• Use AWS Config, Azure Resource Graph, and GCP Cloud Asset Inventory as authoritative data sources
• Enforce tagging at provisioning time through IaC defaults and policy-as-code guardrails
• Assign every asset an owner: unowned resources become security and cost liabilities
• Reconcile inventory regularly and investigate orphaned assets (CMDB record with no real resource and vice versa)
• Track data classification as a mandatory tag to support compliance scoping decisions
• Maintain asset lifecycle states to distinguish active resources from those being decommissioned
• Integrate asset inventory with incident response to quickly identify affected systems during investigations
• Export inventory data for compliance audits in accessible formats (CSV, JSON)
• Review untagged and unclassified resource reports weekly to maintain inventory quality