awsiamPractitioner

Automate TLS Certificates in AWS with ACME: A Game Changer

5 min read AWS BlogJun 30, 2026Reviewed for accuracy

Practitioner — Hands-on experience recommended

In today's fast-paced development environment, managing TLS certificates can be a tedious and error-prone task. Automating this process with ACME support in AWS Certificate Manager not only saves time but also reduces the risk of human error. By leveraging the Automatic Certificate Management Environment (ACME) protocol, you can request, renew, and revoke TLS certificates seamlessly, ensuring your applications remain secure without constant manual oversight.

To get started, set up a dedicated ACME endpoint and configure authorization controls using External Account Binding (EAB). This mechanism allows your ACME clients to register with the server securely. The domain validation step is crucial; it ensures that only authorized personnel can issue certificates for specified domains. The PKI administrator handles domain validation at the endpoint level, while application owners simply register with an EAB credential. This separation of duties enhances security and simplifies the process for developers who need certificates without touching DNS configurations. Key parameters to configure include the endpoint type (Public or Private), the certificate type (Public), and the domain scope, which controls what patterns your ACME clients can request.

In production, remember that ACME support is available in all commercial AWS Regions, with future availability in AWS GovCloud and other regions. This feature can significantly streamline your certificate management process, but be aware of the need for proper configuration to avoid pitfalls. Ensure your EAB credentials are securely managed and that domain scopes are correctly set to prevent unauthorized requests.

Key takeaways

→Set up a dedicated ACME endpoint for automated certificate management.
→Use External Account Binding (EAB) for secure client registration.
→Validate domains at the endpoint level to separate duties between PKI admins and application owners.
→Configure key parameters like endpoint type and domain scope for precise control.
→Leverage ACME support in all commercial AWS Regions for streamlined TLS management.

Why it matters

Automating TLS certificate issuance reduces manual overhead, minimizes errors, and ensures your applications maintain secure connections without constant human intervention, which is critical for maintaining uptime and security in production environments.

Code examples

Bash

1certbot certonly --standalone --non-interactive --agree-tos \
2    --email <EMAIL> \
3    --server https://acm-acme-enroll.us-east-1.api.aws/<ENDPOINT_ID>/directory \
4    --eab-kid <EAB_KID> \
5    --eab-hmac-key <EAB_HMAC_KEY> \
6    --issuance-timeout <ISSUANCE_TIMEOUT> \
7    -d <DOMAIN>