TL;DR
Microsoft has released Azure Linux 4.0 into public preview, transforming it from an internal, specialized OS into a general-purpose Linux suitable for any Azure VM. This change broadens its applicability beyond cloud infrastructure. The development is confirmed, but full features and adoption details are still emerging.
Microsoft has announced the release of Azure Linux 4.0 into public preview at Build 2026, marking its transition from an internal, specialized cloud OS to a general-purpose Linux distribution available for any Azure VM.
Azure Linux 4.0 is derived from Fedora 43 and is now available for deployment on any Azure virtual machine, not just as the host OS for Azure Kubernetes Service (AKS). This shift allows users to run Azure Linux as a standalone, general-purpose Linux distribution, expanding its role beyond internal infrastructure.
The distribution is built with a focus on transparency and security, using declarative overlays on Fedora upstream, with components like Kernel 6.18 LTS, glibc 2.42, systemd 258, and OpenSSL 3.5. It supports security features such as SELinux, kernel hardening, and cryptographic signing of packages. Microsoft maintains its own kernel fork with embedded signing keys.
Why It Matters
This development is significant because it marks Microsoft’s move to offer a fully supported, general-purpose Linux distribution tailored for cloud workloads. It enables broader adoption by developers and enterprises, who can now deploy Azure Linux 4.0 on various VM types, containers, and development environments, use your Nvidia GPU’s VRAM as swap space on Linux.
By making Azure Linux accessible as a standalone OS, Microsoft enhances its position in the cloud-native and Linux markets, potentially influencing the landscape of cloud operating systems and Linux distributions used in enterprise settings.
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Background
Microsoft has long integrated Linux into its cloud services, starting with hosting Linux VMs in 2012, joining the Linux Foundation in 2016, and making Linux the majority OS on Azure by 2019. California moves to exempt Linux from its age-verification law after backlash. Prior internal distros included CBL-Delridge and CBL-Mariner, with Mariner evolving into Azure Linux. Until now, Azure Linux was primarily used as a host OS for infrastructure services like AKS and WSL.
The release of Azure Linux 4.0 represents a strategic shift, making this internal, specialized OS available for general use, aligning with Microsoft’s broader support for open-source and Linux ecosystems.
“Azure Linux 4.0 is built to be a versatile, general-purpose Linux distribution that can run across all Azure compute surfaces.”
— Microsoft spokesperson
“This move signifies Microsoft’s recognition of Linux as a core platform, providing a transparent, auditable, and minimal Linux OS for cloud workloads.”
— Open source analyst
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What Remains Unclear
Details about the full adoption rate, performance benchmarks, and how quickly users will migrate to Azure Linux 4.0 remain unclear. It is also uncertain how this will influence third-party Linux distributions or cloud providers in the near term. Why is Vivado 2026.1 dropping Linux support for free tier?
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What’s Next
Microsoft is expected to expand availability of Azure Linux 4.0 across all Azure regions and VM types. Further updates may include additional features, community feedback integration, and broader ecosystem support. Monitoring adoption rates and user feedback will be key in assessing its impact.
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Key Questions
What is Azure Linux 4.0?
Azure Linux 4.0 is Microsoft’s first general-purpose Linux distribution designed for deployment on any Azure virtual machine, expanding beyond its previous specialized role.
How is Azure Linux 4.0 different from previous versions?
Unlike earlier versions, which were internal and specialized, Azure Linux 4.0 is built from Fedora upstream, is fully auditable, and intended for general use across all Azure compute surfaces.
Will I be able to run Azure Linux 4.0 outside of Azure?
Currently, it is designed specifically for Azure VMs and related services. Its deployment outside Azure has not been announced.
When will Azure Linux 4.0 be generally available?
The distribution is currently in public preview, with general availability expected later in 2026 based on feedback and development progress.
What security features does Azure Linux 4.0 include?
It supports SELinux, kernel hardening, cryptographically signed packages, and is in progress for FIPS 140-3 certification, ensuring a secure platform for cloud workloads.
Source: Hacker News
