AWS Certificate Manager (ACM) Integration | Overview.

AWS Certificate Manager (ACM) Integration - Overview.

Scope:

• Intro,
• Core Integrated Services,
• Key Integration Features,
• Concept of AWS Certificate Manager (ACM) Integration (Deep Dive),
• The two main types of ACM certificates,
• Integration Architecture,
• Key Integrated Services & Integration Functions,
• Flow Sample for (ACM) Public Certificates & typical automated Integration Pattern,
• Integration with ACM Private CA & Description,
• Multi-Region & Multi-Account Integration (To scale ACM across an enterprise setup),
• Automated CI/CD Integration Tools & Use Cases,
• Monitoring & Operations,
• Best Practice,
• Architecture Diagram (ACM Integration & Public Certificates Automation).

Intro:

• AWS Certificate Manager (ACM) simplifies the management of SSL/TLS certificates by integrating directly with various AWS services to handle encryption for websites and applications. 

Core Integrated Services

• ACM certificates cannot be installed directly on Amazon EC2 instances (except through Nitro Enclaves). 
• Instead, ACM certificates must be deployed via integrated services like: 
• Elastic Load Balancing (ELB): Certificates are attached to Application, Network, or Classic Load Balancers to terminate (end encryption ) TLS traffic before it reaches twtech backend.
• Amazon CloudFront: Used to secure content delivery at edge locations. Certificates for CloudFront must be requested or imported in the us- east-1 (N. Virginia) region.
• Amazon API Gateway: Certificates can be associated with custom domain names for REST, HTTP, and WebSocket APIs.
• AWS Elastic Beanstalk: Integrated to simplify SSL termination for web environments.
• AWS App Runner: Uses ACM to provide managed TLS certificates for containerized web services.
• AWS Amplify: Automatically provisions and manages ACM certificates for custom domains. 

Key Integration Features

• Managed Renewal: ACM automatically renews certificates it issues (if DNS or Email validation is active), provided they are associated with an integrated service.
• DNS Validation via Route 53: If twtech domain uses Amazon Route 53, ACM can automatically create the necessary CNAME records to validate domain ownership.
• CloudFormation Support: twtech can automate certificate provisioning and validation as part of its Infrastructure-as-Code.
• Private CA Integration: Use ACM with AWS Private CA to issue and manage internal certificates for private resources or Kubernetes workloads.

Concept of AWS Certificate Manager (ACM) Integration (Deep Dive)

• AWS Certificate Manager (ACM) is a fully managed service that handles:
• Provisioning, 
• Deployment, 
• Renewal of SSL/TLS certificates that are used with AWS services and twtech internal applications.

The two main types of ACM certificates:

• Public Certificates – Issued by Amazon’s public CA and automatically trusted by browsers.
• Private Certificates – Issued by twtech own ACM Private CA.

Integration Architecture

• ACM integrates natively with several AWS services to secure traffic (HTTPS/TLS) and automate certificate management.

Key Integrated Services & Integration Functions

Category	AWS Service	Integration Function
Compute / Web	Elastic Load Balancing (ALB, NLB, CLB)	ACM certificates can be directly attached to Load Balancer listeners.
	Amazon CloudFront	ACM (in us-east-1) issues public certs for CDN distributions.
	AWS API Gateway	ACM certs secure custom domain endpoints.
	AWS App Runner / ECS / EKS	ACM certs used via Load Balancer or Ingress controllers.
Networking / Edge	AWS Global Accelerator	Supports ACM certificates for static IP endpoints.
	AWS Cloud Map	Uses ACM for service discovery endpoints (HTTPS).
Private Infrastructure	ACM Private CA + PrivateLink / VPC Endpoints	Issue internal-use-only certificates.
Automation & Deployment	CloudFormation / CDK / Terraform	Automates certificate requests, validation (DNS), and attachments.
Security & Compliance	AWS Organizations, IAM, CloudTrail, Config	Track and control certificate use and compliance posture.

Flow Sample for (ACM) Public Certificates & typical automated integration pattern:

1. Certificate Request
• CloudFormation or Lambda requests a public ACM certificate for a domain (e.g., api.example.com).
2. DNS Validation
• ACM provides a CNAME record for validation.
• A Route 53 automation stack creates the validation record automatically (using delegation or cross-account automation).
3. Validation & Issuance
• ACM validates the DNS record and issues the certificate.
• CloudFormation waits for the “Issued” state.
4. Attachment
• The certificate ARN is passed to a Load Balancer or CloudFront distribution for deployment.
5. Auto Renewal
• ACM handles renewal.
• DNS validation records remain valid for future renewals.
6. Cross-Account Use (Optional)
• Certificate ARNs shared via Resource Access Manager (RAM).
• Other accounts can reference the certificate for use in ALBs, etc.

 Integration with ACM Private CA & Description

Feature	Description
Private CA Creation	Managed CA created in ACM PCA.
Private Certificate Issuance	ACM requests a cert from your Private CA.
Integration Points	Works with internal ELBs, App Mesh, IoT, or private APIs.
Security Controls	IAM policies and permissions control who can issue and use private certs.
Audit / Logging	All CA and certificate operations logged via CloudTrail and optional CRL or OCSP publishing.

 Multi-Region & Multi-Account Integration (To scale ACM across an enterprise setup):

• Centralized Certificate Management Account
• Requests and owns ACM certs (public or private).
• Shares certs via AWS RAM.
• Application Accounts
• Consume shared certificates (e.g., ALB, API Gateway).
• Automation
• CloudFormation StackSets or Lambda handle DNS validation automatically in each region/account.

Best Practice: 

• Centralize ACM + Route 53 under a “Shared Services” account.

 Automated CI/CD Integration Tools & Use Cases

Tool	Use Case
CloudFormation	Define and provision ACM certs and attach to ELB, API Gateway, etc.
AWS CLI / SDK	Scripted requests, validation checks, rotation automation.
Lambda Automation	Rotate imported certs, automate DNS validation updates.
CodePipeline	Integrate ACM validation and certificate deployment into CI/CD.

 Monitoring & Operations

• CloudWatch Metrics
• CertificateRenewalElapsedTime, Issued, PendingValidation
• AWS Config Rules
• Detect expired or expiring certificates.
• AWS Health Dashboard
• ACM-managed certificate events (e.g., renewal failure).
• CloudTrail
• Audit certificate requests, imports, and attachments.

Architecture Diagram (ACM Integration & Public Certificates Automation)