Releases

Release Channels

Stable
1688.5.3

The Stable channel is intended for use in production clusters. Versions of Flatcar Linux have been tested as they move through Alpha and Beta channels before being promoted to stable.

Beta
1745.2.0

The Beta channel is where Flatcar Linux stability is solidified. We encourage including some beta machines in production clusters in order to catch any issues that may arise with your setup.

Alpha
1772.0.0

The Alpha channel follows a more frequent release cadence and is where new updates are introduced. Users can try the news versions of the Linux kernel, systemd and other core packages.

Release Notes

docker 17.12.1 ignition 0.22.0 kernel 4.14.32 rkt 1.29.0 systemd 237

Flatcar updates

Initial Flatcar release.

Bug fixes:

Notes:

  • Previous test images have been removed from the release servers. This is due to a new update key being generated using our updated security policy which we included in the first public image.

Upstream Container Linux updates:

Bug fixes:

docker 18.03.1 ignition 0.24.0 kernel 4.14.39 rkt 1.29.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Updates:

docker 18.03.0 ignition 0.24.0 kernel 4.14.35 rkt 1.29.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix docker2aci tar conversion (#2402)

Changes:

  • Switch to the LTS Linux version 4.14.35 for the beta channel
docker 17.12.1 ignition 0.23.0 kernel 4.14.30 rkt 1.29.0 systemd 237

Flatcar updates

Initial Flatcar release.

Bug fixes:

Notes:

  • Previous test images have been removed from the release servers. This is due to a new update key being generated using our updated security policy which we included in the first public image.

Upstream Container Linux updates:

Bug fixes:

  • Fix kernel panic with vxlan (#2382)
docker 18.04.0 ignition 0.24.0 kernel 4.16.7 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix GRUB free magic error on existing systems (#2400)

Changes:

  • Support storing sudoers in SSSD and LDAP
  • No longer publish Oracle Cloud release images

Updates:

docker 18.04.0 ignition 0.24.0 kernel 4.16.3 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Pass /etc/machine-id from the host to the kubelet
  • Fix docker2aci tar conversion (#2402)
  • Switch /boot from FAT16 to FAT32 (#2246)

Changes:

  • Make Ignition failures more visible on the console

Updates:

docker 18.03.0 ignition 0.24.0 kernel 4.15.15 rkt 1.29.0 systemd 238

Flatcar updates

Initial Flatcar release.

Notes:

  • Previous test images have been removed from the release servers. This is due to a new update key being generated using our updated security policy which we included in the first public image.

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Fix GRUB crash at boot (#2284)

Updates: