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Two Week Atomic

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Fedora Atomic Host is an implementation of the Project Atomic pattern for a specialized operating system for the deployment of containerized applications. For the past two Fedora releases, we've included an Atomic Host cloud image as a non-blocking deliverable. However, upstream Atomic is moving very fast — by the end of the alpha, beta, final stabilization cycle Fedora uses, the released artifact is basically obsolete. Additionally, the Project Atomic team at Red Hat would like to do their ongoing development work in the Fedora upstream, and the six-month release cycle does not lend itself to that.

This change moves Atomic away from the main Fedora 6-month distribution release, and instead to separate releases every two weeks on a new web site,


Current status

  • Targeted release: Fedora 23 (but actually ideally will start with F22, long before F23 release)
  • Last updated: 2015-06-16
  • Tracker bug: <will be assigned by the Wrangler>

Detailed Description


1. Move Atomic away from the main Fedora 6-month distribution release, including:

2. Updated Fedora Atomic Host images produced every two weeks, and presented at:

Image Production

1. Images will be produced nightly (See Release Engineering Ticket #6196.)

  • qcow2 / raw.xz
  • vagrant variant
  • (Installer ISO and PXE-to-Live?)

2. These images will be built using Anaconda's ostree-target mode from a nightly tree built from the current Fedora release (i.e., currently Fedora 22) plus updates — this may include updates-testing.

  • will use current-release anaconda for this
  • may need a mechanism to include an updates.img

3. When the next Fedora release (e.g., F23) branches, those images will also start production (but may not be the target for release; see below)


  • Testing will be almost entirely automated and will not require extra resources from the QA team.
  1. Whenever a new image is produced, a listener will receive the associated message on the Fedora message bus
  2. a battery of tests will be automatically executed (initially using tunir (the goal is to migrate to Tasktron when that is ready)
  3. test results will be fed back to fedmsg
  4. and available on a dashboard somewhere
  • If no image is successfully produced, a tracker bug should be automatically filed
    • if an open tracker bug already exists, just add a comment rather than filing a new one
    • if such a tracker bug is open, a successful build should auto-close it
  • Of course, QA team expertise and help is always welcome
  • There should also be a mechanism for manually marking an image as failed even if it passes the automatic tests


  • As with testing, the goal is for this process to be entirely automatic (after initial development, of course).

1. Every two weeks, a process will scan the fedmsg history for image builds which have passed the tests, and

2. If no image passed the tests since the previous image was posted:

  • leave link to previous image
  • include warning text that this is stale
  • link to most recent failure-tracking bug (see above)
  • decision! either:
    • a. rerun nightly until a successful image is found
    • b. just skip this cycle, to keep releases predicable

3. Bonus feature: ability to revoke a published image

  • connected to the ability to manually fail an image
  • on that trigger, rescan back for previous-good image
  • update website linking to that, warning that the previous one was bad

Docs and Website

The website will need initial design and creation, of course, but after that it is intended to be automated; no one should have to update links automatically. It should be a very simple design, with pointers to Fedora docs (hopefully, soon, new short-easy-docs website) and to

Naming and Trademark

We would like to use the name "Fedora Atomic Host", and phrasing like "Fedora Atomic Host, based on Fedora 22". This highlights the fact that while this project is under the Fedora umbrella, it isn't part of the traditional distribution release cycle. (The various images will be distinguished by date rather than by number.)

Fedora Atomic Host was previously presented as part of the general Fedora release under Fedora Cloud, but this new, separate approach should get council approval under the Trademark Guidelines for new combinations of unmodified Fedora software.


The Cloud WG had previously considered making Fedora Atomic Host its main offering, however at present Atomic is not ready to fill that role, as it is changing too fast and not flexible enough for all use cases the Cloud WG targets. The Cloud WG / Cloud SIG will need to find other selling points. It may be that after several cycles, Atomic will mature enough to be the primary Fedora Cloud offering.

The two-week cycle means no big semi-annual PR blitz, but interesting new features and functionality should come rather frequently. This may provide an opportunity for showcasing Fedora in the middle of our development cycle, when Fedora usually doesn't get much press.

Benefit to Fedora

  • Fedora Atomic Host puts Fedora in the spotlight as a leader in modern operating system innovation
  • Fedora becomes the proper upstream for Atomic Host development
  • Early-adopters interested in collaborating on Atomic development have a public place to do so
  • Fedora users interested in Atomic get a better experience


Proposal owners

  • Update koji for nightly image builds (in conjunction with Rel-Eng; see below)
  • Create automatic test system
  1. listener for successful builds
  2. automatic test execution
  3. results to fedmsg
  4. results dashboard
  5. mechanism to mark a build as bad even if automatic tests pass
  • Automatic filing of ticket or bug if there are no successful builds
  • Create automatic release system
  1. every two weeks, scan for images which pass all tests
  2. integration with fedimg
  3. upload to alt.fpo
  4. update website
  5. email announcement
  6. fallback mechanism for no builds in two weeks
  • Create new website if websites team unavailable for this effort
  • Coordination, cheerleading: Matthew Miller

uh, help wanted, y'all

Other developers

  • Cloud SIG:
    • Help with tunir and the automatic testing component
    • Fedimg integration with the auto-release tool
  • Quality Assurance:
    • Help with tests would be awesome

Release engineering

The primary release engineering effort is the nightly production of images. The current release engineering tools have all the parts needed to do this, but have never been used in that way before, so some development effort is required to enable the production of current + updates nightlies. (This work, however, many also benefit other areas of the project, like updated Cloud Base images or even Workstation live CDs.)

Additionally, as described above, the tool to automatically ship auto-accepted images every two weeks logically falls under the rel-eng banner.

Adam Miller, on the release engineering team, is specifically prioritizing this work.


  • Policies and guidelines: none
  • Trademark approval: ticket to be filed with the Council

Upgrade/compatibility impact

This means that users on Fedora 21 and/or 22 Atomic host will need to move to the 2-week or CentOS builds to continue using Atomic host over the long term, until such time as we re-integrate Fedora Atomic Host under Cloud or as a separate edition (if that happens).

How To Test

N/A (not a System Wide Change)

User Experience

N/A (not a System Wide Change)


N/A (not a System Wide Change)

Contingency Plan

  • Contingency mechanism: (What to do? Who will do it?) N/A (not a System Wide Change)
  • Contingency deadline: N/A (not a System Wide Change)
  • Blocks release? N/A (not a System Wide Change), Yes/No
  • Blocks product? product


N/A (not a System Wide Change)

Release Notes