Fedora Release Life Cycle

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Fedora项目差不多每6个月发布一个新版本，并对这些版本提供将近13个月的更新包(维护)。这样的话就允许用户“跳过某个版本”，而同时还能接收到其所用版本的更新。

开发计划

We say developed and released approximately every 6 months because like many things, they don't always go exactly as planned.

The schedule for the release currently under development, Fedora 42, is on its release schedule page. Alpha, Beta, and General Availability (final) releases happen at 10:00am Eastern US Time, which is either 1500UTC or 1400UTC depending on whether or not daylight savings is in effect.

制定计划的原则

Fedora release schedules are proposed by the Release Engineering team and ratified by Fedora Engineering Steering Committee (FESCo). FESCo is responsible for overseeing the technical direction of the Fedora distribution. A core schedule is created using the key tasks listed below. Detailed team schedules are built around these dates.

Task/Milestone	Start Day	Length
Planning and Development	Day After GA of Previous Release	Depends on GA date and working backwards from all the tasks below
Feature Acceptance Deadline	Tuesday--Two weeks before Feature Freeze	n/a
Feature Freeze	Tuesday--1 week before Alpha Change Deadline	Until GA
Branch Freeze Event	Tuesday--One week before Alpha Change Deadline	Branch Freeze Policy in effect until GA.
Alpha Change Deadline	Tuesday--Two weeks before the Alpha Release
String Freeze	Same time as Alpha Change Deadline	Software String Freeze Policy in effect until GA.
Alpha Compose	Thursday--Two days after the Alpha Change Deadline	1 day
Alpha Go/No-Go Meeting	Wednesday @ 17:00 E{D,S}T--six days after Alpha Compose	n/a
Alpha Release	Tuesday--Two weeks after Branch Freeze and 12 days after Alpha Compose	Public testing of Alpha lasts 3 weeks
Beta Change Deadline	Tuesday--Two weeks before the Beta Release
Feature Complete	Tuesday--Same as the Beta Change Deadeline	n/a
Beta Compose	Thursday--Two days after the Beta Change Deadline	1 day
Beta Go/No-Go Meeting	Wednesday @ 17:00 E{D,S}T--six days after Beta Compose	n/a
Beta Release	Tuesday--Two weeks after the Beta Change Deadline and 12 days after Beta Compose	Public testing of Beta lasts 2 weeks + 6 days (ends on a Monday)
Final Change Deadline	Monday--End of Beta Release Testing	In effect until GA
Compose Final RC	Thursday--three days after Final Change Deadline	1 day
Test Final RC	Thursday to Tuesday	6 days
Final Go/No-Go Meeting	Tuesday @ 17:00 E{D,S}T after Test Final RC	n/a
GA Release	Tuesday--Seven days after Test Final RC ends	n/a
Maintenance	Tuesday--GA release day	~13 Months
End of Life	One month after GA of current release + 2 releases	n/a

Steps to Construct a New Schedule

This is admittedly an unusual methodology, but it is fairly easy to generate using the the TaskJuggler schedules John Poelstra creates.

1. Pick GA date (the Tuesday before May 1st or October 31st)
2. Work backwards using consistent spacing for freezes, composes, and releases for Alpha, Beta, and Final, as described above
3. Set the feature submission and completion dates working backwards from the Branch Freeze date
4. The time between the feature submission deadline and the GA of the previous release is the time dedicated to development
   • Development time varies from from release to release based on how when the previous release finished
   • The freeze and testing time (from Branch Freeze until GA) is held constant from release to release

Development Schedule Rationale

Fedora generally develops new releases over a six month period to provide a regular and predictable release schedule. The bi-annual targeted release dates are May Day (May 1st) and Halloween (October 31) making them easy to remember and avoiding significant holiday breaks. Changes to this standard must be approved by the community-elected Fedora Engineering Steering Committee (FESCo).

A six month release schedule also follows the precedence of Red Hat Linux (precursor to Fedora). Former Red Hat software engineer Havoc Pennington offers a historical perspective here. GNOME started following a time based release based on the ideas and success of Red Hat Linux and other distributions following Fedora having adopted a similar release cycle. Several other major components, including the Linux kernel, Openoffice.org, Xorg, have started following a time based release schedule. While the exact release schedules vary between these components and other upstream projects, the interactions between these components and Fedora makes a six month time based release schedule a good balance.

Schedule Contingency Planning

If the Alpha, Beta, or Final Go/No Go meetings result in a "No Go" determination, that milestone and subsequent milestones will be pushed back by one week.

One week is the added to the schedule to maintain the practice of releasing on Tuesdays. Tuesdays are the designated release day because they are good days for news coverage and the established day we synchronize our content with the mirrors that carry our releases. Go/No Go meetings receive input from representatives of FESCo, Release Engineering, and Quality Assurance.

维护计划

We say maintained for approximately 13 months because the supported period for releases is dependent on the date the release under development goes final. As a result, Release X is supported until one month after the release of Release X+2.

This translates into:

• Fedora 40 will be maintained until 1 month after the release of Fedora 42.
• Fedora 41 will be maintained until 1 month after the release of Fedora 43.

Maintenance Schedule Rationale

Fedora is focused on free and open source software innovations and moves quickly. If you want a distribution that moves slower but has a longer lifecycle, Red Hat Enterprise Linux, which is derivative of Fedora or free rebuilds of that such as CentOS might be more suitable for you. Refer to the RHEL page for more details.

Historically, the Fedora Project has found supporting two releases plus Rawhide and the pre-release Branched code to be a manageable work load.

End of Life (EOL)

When the a release reaches the point where it no longer supported, updates are no longer created for it and it is considered End of Life (EOL). Branches for new packages in the SCM are not allowed for distribution X after the Fedora X+2 release and new builds are no longer allowed.

The tasks performed at EOL are documented in the End of life SOP.

Additional Release Schedule Information

• Overview of Releases, including currently supported releases
• Unsupported Releases
• Historical Release Information