From 5d45f269aac3a89550c39ee90bbcf70c711b84dd Mon Sep 17 00:00:00 2001
From: Florian Klink <flokli@flokli.de>
Date: Thu, 19 Nov 2020 00:36:04 +0100
Subject: [PATCH] nixos/k3s: disable unifiedCgroupHierarchy

This gets automatically disabled by docker if the docker backend is
used, but the bundled containerd also doesn't seem to support cgroupsv2,
so disable it explicitly here, too.
---
 nixos/modules/services/cluster/k3s/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nixos/modules/services/cluster/k3s/default.nix b/nixos/modules/services/cluster/k3s/default.nix
index 2e8bf20a68f..f0317fdbd16 100644
--- a/nixos/modules/services/cluster/k3s/default.nix
+++ b/nixos/modules/services/cluster/k3s/default.nix
@@ -76,6 +76,10 @@ in
       enable = mkDefault true;
     };
 
+    # TODO: disable this once k3s supports cgroupsv2, either by docker
+    # supporting it, or their bundled containerd
+    systemd.enableUnifiedCgroupHierarchy = false;
+
     systemd.services.k3s = {
       description = "k3s service";
       after = mkIf cfg.docker [ "docker.service" ];