Releases

Release Channels

Stable
1911.3.0

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
1939.1.0

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
1953.0.0

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 18.06.1 ignition 0.28.0 kernel 4.14.78 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

  • Fix systemd re-executing with arbitrary supplied state (CVE-2018-15686)
  • Fix systemd race allowing changing file permissions (CVE-2018-15687)
  • Fix systemd-networkd buffer overflow in the dhcp6 client (CVE-2018-15688)
docker 18.06.1 ignition 0.26.0 kernel 4.14.74 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

  • Fix Git remote code execution during recursive clone (CVE-2018-17456)

Updates:

docker 18.06.1 ignition 0.26.0 kernel 4.14.67 rkt 1.30.0 systemd 238

Flatcar updates

Changes:

docker 18.06.1 ignition 0.26.0 kernel 4.14.67 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix Docker mounting named volumes (#2497)
docker 18.03.1 ignition 0.25.1 kernel 4.14.63 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Updates:

docker 18.03.1 ignition 0.25.1 kernel 4.14.59 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Fix failure to mount large ext4 filesystems (#2485)
docker 18.03.1 ignition 0.25.1 kernel 4.14.59 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix kernel CIFS client (#2480)

Updates:

docker 18.03.1 ignition 0.25.1 kernel 4.14.55 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

No changes for stable promotion

docker 18.03.1 ignition 0.24.1 kernel 4.14.48 rkt 1.29.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix TCP connection stalls (#2457)
docker 18.03.1 ignition 0.24.1 kernel 4.14.48 rkt 1.29.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix Hyper-V network driver regression (#2454)

Updates:

docker 18.03.1 ignition 0.24.1 kernel 4.14.44 rkt 1.29.0 systemd 238

Upstream Container Linux updates:

Security fixes:

  • Fix Git arbitrary code execution when cloning untrusted repositories (CVE-2018-11235)

Bug fixes:

  • Fix failure to set network interface MTU (#2443)

Updates:

docker 18.03.1 ignition 0.24.1 kernel 4.14.42 rkt 1.29.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix inadvertent change of network interface names (#2437)
docker 18.03.1 ignition 0.24.1 kernel 4.14.42 rkt 1.29.0 systemd 238
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 18.06.1 ignition 0.28.0 kernel 4.14.79 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

  • Fix systemd re-executing with arbitrary supplied state (CVE-2018-15686)
  • Fix systemd race allowing changing file permissions (CVE-2018-15687)
  • Fix systemd-networkd buffer overflow in the dhcp6 client (CVE-2018-15688)

Changes:

  • Switch to the LTS Linux version 4.14.79 for the beta channel
docker 18.06.1 ignition 0.28.0 kernel 4.14.78 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

  • Fix Git remote code execution during recursive clone (CVE-2018-17456)

Bug fixes:

  • Fix missing kernel headers (#2505)

Updates:

docker 18.06.1 ignition 0.28.0 kernel 4.14.74 rkt 1.30.0 systemd 238

Flatcar updates

Changes:

Bug fixes:

Upstream Container Linux updates:

Changes:

  • Switch to the LTS Linux version 4.14.74 for the beta channel
docker 18.06.1 ignition 0.28.0 kernel 4.14.69 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix Docker mounting named volumes (#2497)

Changes:

  • Switch to the LTS Linux version 4.14.69 for the beta channel

Updates:

docker 18.06.1 ignition 0.26.0 kernel 4.14.67 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Changes:

  • Drop AWS PV images from regions which do not support PV

Updates:

docker 18.06.0 ignition 0.26.0 kernel 4.14.63 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Fix PXE systems attempting to mount an ESP (#2491)

Changes:

  • Switch to the LTS Linux version 4.14.63 for the beta channel
docker 18.03.1 ignition 0.26.0 kernel 4.14.60 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Fix failure to mount large ext4 filesystems (#2485)

Updates:

docker 18.03.1 ignition 0.26.0 kernel 4.14.59 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix kernel CIFS client (#2480)

Updates:

docker 18.03.1 ignition 0.26.0 kernel 4.14.57 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Changes:

  • Switch to the LTS Docker version 18.03.1-ce for the beta channel
  • Switch to the LTS Linux version 4.14.57 for the beta channel
docker 18.03.1 ignition 0.25.1 kernel 4.14.55 rkt 1.30.0 systemd 238
docker 18.03.1 ignition 0.25.1 kernel 4.14.50 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Changes:

  • Switch to the LTS Docker version 18.03.1-ce for the beta channel
  • Switch to the LTS Linux version 4.14.50 for the beta channel
docker 18.03.1 ignition 0.24.1 kernel 4.14.49 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix TCP connection stalls (#2457)

Updates:

docker 18.03.1 ignition 0.24.1 kernel 4.14.48 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix Hyper-V network driver regression (#2454)

Updates:

docker 18.03.1 ignition 0.24.1 kernel 4.14.47 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

  • Fix Git arbitrary code execution when cloning untrusted repositories (CVE-2018-11235)

Bug fixes:

  • Fix inadvertent change of network interface names (#2437)
  • Fix failure to set network interface MTU (#2443)

Updates:

docker 18.03.1 ignition 0.24.1 kernel 4.14.42 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Changes:

  • Switch to the LTS Docker version 18.03.1-ce for the beta channel
  • Switch to the LTS Linux version 4.14.42 for the beta channel

Updates:

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 18.06.1 ignition 0.28.0 kernel 4.19.1 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

  • Fix systemd re-executing with arbitrary supplied state (CVE-2018-15686)
  • Fix systemd race allowing changing file permissions (CVE-2018-15687)
  • Fix systemd-networkd buffer overflow in the dhcp6 client (CVE-2018-15688)

Bug fixes:

  • Add AWS and GCE disk aliases in the initramfs for Ignition (#2481)
  • Add compatibility nf_conntrack_ipv4 kernel module to fix kube-proxy IPVS on Linux 4.19 (#2518)

Updates:

docker 18.06.1 ignition 0.28.0 kernel 4.19.0 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Fix missing kernel headers (#2505)

Updates:

docker 18.06.1 ignition 0.28.0 kernel 4.18.12 rkt 1.30.0 systemd 238

Flatcar updates

Changes:

Bug fixes:

Upstream Container Linux updates:

Updates:

docker 18.06.1 ignition 0.28.0 kernel 4.18.9 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix Google Compute Engine OS Login activation (#2503)

Updates:

docker 18.06.1 ignition 0.28.0 kernel 4.18.7 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix Docker mounting named volumes (#2497)
  • Fix Azure disk detection in Ignition (#2481)

Changes:

  • Add support for Google Compute Engine OS Login
  • Enable support for Mellanox Ethernet switches

Updates:

docker 18.06.1 ignition 0.28.0 kernel 4.18.5 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Changes:

  • Add CIFS userspace utilities (#571)
  • Drop AWS PV images from regions which do not support PV

Updates:

docker 18.06.0 ignition 0.27.0 kernel 4.17.15 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Fix PXE systems attempting to mount an ESP (#2491)

Updates:

docker 18.06.0 ignition 0.26.0 kernel 4.17.12 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Fix failure to mount large ext4 filesystems (#2485)

Updates:

docker 18.06.0 ignition 0.26.0 kernel 4.17.11 rkt 1.30.0 systemd 238
docker 18.06.0 ignition 0.26.0 kernel 4.17.9 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Changes:

  • Add torcx remotes support

Updates:

docker 18.05.0 ignition 0.26.0 kernel 4.17.3 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Changes:

  • Reads of /dev/urandom early in boot will block until entropy pool is fully initialized
  • Support friendly AWS EBS NVMe device names (#2399)

Updates:

docker 18.05.0 ignition 0.26.0 kernel 4.16.16 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix Hyper-V network driver regression (#2454)

Changes:

Updates:

docker 18.05.0 ignition 0.25.1 kernel 4.16.14 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix Hyper-V network driver regression (#2454)
docker 18.05.0 ignition 0.25.1 kernel 4.16.14 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Bug fixes:

  • Fix failure to set network interface MTU (#2443)
  • Fix inadvertent change of network interface names (#2437)
  • Fix Docker bind mounts from root filesystem (#2440)

Changes:

  • Update VMware virtual hardware version to 11 (ESXi > 6.0)

Updates:

docker 18.05.0 ignition 0.25.1 kernel 4.16.13 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

  • Fix Git arbitrary code execution when cloning untrusted repositories (CVE-2018-11235)

Bug fixes:

  • Fix failure to set network interface MTU (#2443)

Updates:

docker 18.05.0 ignition 0.25.1 kernel 4.16.10 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Bug fixes:

  • Fix inadvertent change of network interface names (#2437)
  • Fix Docker bind mounts from root filesystem (#2440)
docker 18.05.0 ignition 0.25.1 kernel 4.16.10 rkt 1.30.0 systemd 238

Upstream Container Linux updates:

Security fixes:

Changes:

  • Enable QLogic FCoE offload support (#2367)
  • Enable hardware RNG kernel drivers (#2430)
  • Add notrap to ntpd default access restrictions (#2220)
  • Allow booting default GRUB menu entry if GRUB password is enabled (#1597)
  • coreos-install -i no longer modifies grub.cfg (#2291)
  • QEMU wrapper script now enables VirtIO RNG device

Updates:

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: