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wiki/concepts/ARM-AMI.md

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+---
+title: "ARM-AMI"
+type: concept
+tags: [AWS, AMI, ARM]
+last_updated: 2026-05-07
+---
+
+## Definition
+
+ARM-AMI refers to Amazon Machine Images (AMIs) built for EC2 instances running on ARM-based processors (Graviton/Graviton2/Graviton3). These AMIs are optimized for ARM architecture and offer better price-performance ratio compared to x86 AMIs for many workloads.
+
+## Key Characteristics
+
+- **Architecture**: ARM64 (AArch64), based on AWS Graviton processor family
+- **Performance**: Better price-performance for many workloads (web servers, containers, microservices)
+- **Cost**: Lower licensing costs (no x86 licensing fees)
+- **Availability**: Available for Amazon Linux, Ubuntu, RHEL, and other supported OSes
+- **Shared Infrastructure**: AMIs, EBS volumes, and KMS keys shared across all organization accounts
+
+## AMI Roadmap Context
+
+Per [[ctp-topic-50-ami-roadmap-for-aws-amis]], the ARM-AMI roadmap milestones:
+
+- **November 2022**: RHEL 9 ARM planned
+- **May 2023**: RHEL 9.4 ARM and Ubuntu 22.04 ARM
+- **Starting May 2023**: All ARM processors related to AMIs are released synchronously
+
+The ordering of ARM AMI releases is primarily driven by [[ADM]] (Architecture Decision Management) requirements.
+
+## Related Concepts
+
+- [[Foundation-AMI]]: CCOE-provided hardened base images on which product teams build
+- [[AMI-Sharing]]: Cross-account AMI sharing mechanism
+- [[OS-Hardening]]: Security hardening applied to AMIs
+
+## Connections
+
+- [[ctp-topic-50-ami-roadmap-for-aws-amis]] → defines ARM-AMI release roadmap
+- [[ctp-topic-26-standard-ami-build-publish-share-processes]] → foundation AMI hardening standards apply to ARM variants
+- [[ctp-topic-58-aws-ec2-image-builder]] → Image Builder used to create ARM-variant AMIs