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gardener / gardener-extension-os-gardenlinux

Gardener extension controller for the Garden Linux operating system
Apache License 2.0
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Drop support for configuring cgroup v1/cgroupfs as a cgroup driver for containerd and kubelet #163

Open MrBatschner opened 4 months ago

MrBatschner commented 4 months ago

How to categorize this PR?

/area os /kind enhancement /kind bug /os garden-linux

What this PR does / why we need it:

Garden Linux since 934 supports cgroup v2. Since then, the Garden Linux extension contained code to determine the cgroup hierarchy of the underlying host and configure containerd and kubelet to use cgroupfs as a cgroup driver if the host os uses cgroup v1 and configure them to use systemd as a cgroup driver if the host os uses cgroup v2. Unfortunately, this cause some issues (#141) in the past.

Since Garden Linux 576 (the last Garden Linux version with cgroup v1) is no longer supported and all future Garden Linux versions will use cgroup v2, with this PR, containerd and kubelet will always be configured to use systemd as cgroup driver - code that would configure either to use cgroupfs is removed.

Note: this extension will require Garden Linux 934 and above is no longer compatible with Garden Linux 576 or lower.

Which issue(s) this PR fixes: Fixes #141

Release note:

Support for cgroup v1 is removed from the Garden Linux extension, containerd and kubelet will always get configured to use `systemd` as a cgroup driver. With this change, the extension is compatible with Garden Linux 934 or newer only.
MrBatschner commented 4 months ago

/ready