Microsoft surprises with its first server Linux distribution: Azure Linux 4.0

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Summary

Microsoft released Azure Linux 4.0, its first general-purpose Linux distribution for Azure, delivered as a Fedora-based open distribution on GitHub. The release separates offerings into Azure Linux 4.0 as a VM image for general workloads and Azure Container Linux (ACL) as an immutable, production-ready container host based on Flatcar for AKS. Microsoft commits to curated packages, predictable monthly security updates, automated opt-in upgrades, and a defined multi-year support lifecycle to simplify maintenance at scale. It will offer WSL images for local development, will not provide a desktop GUI, and positions the distro to support AI-native workloads while continuing to support partner distributions like Red Hat and Ubuntu.

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Microsoft
$1B+
Red Hat
$1B+