Microsoft Transitions Azure App Service for Linux to Ubuntu
In a significant update, Microsoft has revealed that Azure App Service for Linux will now be based on the Ubuntu operating system, moving away from Debian. This change will impact all new major versions of supported development stacks, including popular languages and frameworks such as. NET 10, Python 3.14, Node.js 24, PHP 8.5, and Java 25, all of which are scheduled for release in the coming months.
Advantages of Choosing Ubuntu
The decision to adopt Ubuntu comes with several advantages. While Ubuntu is built on the Debian architecture and will inherit its ecosystem, it offers quicker upstream updates. This shift allows for a more predictable integration of newer libraries and toolchains, enhancing the development experience.
Additionally, Canonical provides long-term support (LTS) for Ubuntu releases for five years, compared to Debian’s three-year full support period. This extended support ensures developers receive timely updates and security fixes, contributing to a more stable environment.
Another potential benefit of migrating to Ubuntu is the ability to produce leaner application images. Microsoft believes this could lead to improvements in both reliability and performance, a critical aspect for modern web applications.
Migration Details and Deployment Continuity
For existing applications utilizing Azure App Service for Linux, no immediate action is necessary; these applications will continue to run on Debian without the need for migration. However, for new applications or any upgrades to the aforementioned runtimes, the Ubuntu-based stack will be the default environment.
Technical aspects such as deployment workflows—including Oryx, GitHub Actions, and Azure CLI—as well as scaling, diagnostics, and networking services will remain unchanged. This continuity aims to ensure a seamless transition for developers.
Performance Expectations and Precautions
Microsoft anticipates that the switch to Ubuntu will result in neutral or positive outcomes regarding build processes. The creation of leaner images is expected to diminish build times and cold-start delays, which is beneficial for applications requiring swift performance.
As a precaution during upgrades, users should review any native packages that their applications utilize, as differences in version numbers or package names may arise under the Ubuntu system. However, Microsoft reassures that no breaking changes are expected for supported frameworks, maintaining compatibility for developers.
Source: Microsoft
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