Azure Linux 4.0 is on the way, and its GitHub repo quietly confirms it's built on Fedora.

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Microsoft announced Azure Linux 4.0 at the Open Source Summit, and its GitHub repository reveals it is built on Fedora as an upstream base. The distro uses TOML configuration files and targeted overlays applied on top of Fedora, with packages sourced directly from Fedora's upstream repositories. Microsoft's announcement blog post notably omits any mention of Fedora, likely due to the awkward dynamic with Red Hat, which is both an Azure partner and a competitor. Also announced: Azure Container Linux is now generally available as an immutable, container-optimized OS with no package manager, targeting security-sensitive deployments. On the AI side, Microsoft unveiled the Microsoft Agent Framework and Agent Governance Toolkit for multi-agent systems.

Wow! Microsoft Now Has a Fedora-based Linux Distro