All 7 AWS Certificate Manager (ACM) questions
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What is AWS Certificate Manager and why is it important for securing web applications? How does domain validation work when requesting a certificate through ACM? Can ACM certificates be used with resources outside of AWS managed services, such as on an EC2 instance running your own web server? How does using a certificate with a CloudFront distribution differ in terms of region requirements compared to other services? What is AWS Certificate Manager Private Certificate Authority, and when would an organization use it instead of public certificates? How should an organization design its certificate management strategy across multiple AWS accounts and regions?
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How does ACM handle automatic certificate renewal, and what is required to keep this working smoothly?

Intermediate

Answer

ACM automatically attempts to renew certificates before they expire, and for certificates validated using DNS validation, this renewal process happens completely automatically as long as the original validation CNAME record remains in place in your DNS configuration, meaning you generally never need to manually renew or reinstall a certificate managed through ACM once it is properly set up.
aws acm list-certificates --certificate-statuses ISSUED
Real-world example A company that initially set up DNS validation for its certificate through Route 53 never experiences a certificate expiration incident, since ACM automatically handles renewal in the background without any manual intervention required.

Common follow-ups: What happens if automatic renewal fails for some reason?;Does ACM send any notifications before a certificate is due to renew?

Amazon Route 53 & DNS Management;AWS CloudTrail & Auditing
All 7 AWS Certificate Manager (ACM) questions