Amazon started shipping its own Linux image for EC2 in 2010. The original Amazon Linux AMI was a rolling, RHEL-like distribution. Amazon Linux 2, released in 2018, added systemd, long-term support and the amazon-linux-extras topic repositories, and it became the default image for many AWS services.
Amazon Linux 2023 changed direction: it is based on Fedora rather than RHEL. A new major version is planned every two years, each with five years of support. It uses DNF, SELinux in permissive mode and deterministic versioned repositories, which lets you pin a server to a known package set.
