Flatcar Linux v2969.0.0 was released to the Alpha channel on Aug 19, 2021. This release brings a big change to the underlying configuration of the OS: the default control groups hierarchy has been switched to CGroupsV2. This blog post explains why these changes are necessary and how they will impact users. cgroup Linux namespaces and control groups (or cgroups) are the core building blocks of containers on Linux. Cgroups restrict the resources (CPU, memory, I/O) that a process or container can consume, which is essential to securely hosting diverse workloads on the same system.

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