Booting Flatcar Linux from an ISO

The latest Flatcar Linux ISOs can be downloaded from the image storage site:

The Alpha channel closely tracks master and is released frequently. The newest versions of system libraries and utilities will be available for testing. The current version is Flatcar Linux 2234.0.0.

Download Alpha ISO Browse Storage Site

All of the files necessary to verify the image can be found on the storage site.

The Beta channel consists of promoted Alpha releases. The current version is Flatcar Linux 2219.2.0.

Download Beta ISO Browse Storage Site

All of the files necessary to verify the image can be found on the storage site.

The Edge channel includes bleeding-edge features with the newest versions of the Linux kernel, systemd and other core packages. Can be highly unstable. The current version is Flatcar Linux 2219.99.1.

Download Edge ISO Browse Storage Site

All of the files necessary to verify the image can be found on the storage site.

The Stable channel should be used by production clusters. Versions of Flatcar Linux are battle-tested within the Beta and Alpha channels before being promoted. The current version is Flatcar Linux 2191.4.0.

Download Stable ISO Browse Storage Site

All of the files necessary to verify the image can be found on the storage site.

Known limitations

  1. UEFI boot is not currently supported. Boot the system in BIOS compatibility mode.
  2. There is no straightforward way to provide an Ignition config.
  3. A minimum of 2 GB of RAM is required to boot Flatcar Linux via ISO.

Install to disk

The most common use-case for this ISO is to install Flatcar Linux to disk. You can find those instructions here.

No authentication on console

The ISO is configured to start a shell on the console without prompting for a password. This is convenient for installation and troubleshooting, but use caution.