From ce44a334cc7e2a53ae0a2bdbe787a2927f40a210 Mon Sep 17 00:00:00 2001
From: Gabriel Ebner <gebner@gebner.org>
Date: Mon, 30 Aug 2021 13:01:09 +0200
Subject: [PATCH] Force enable unified cgroup hierarchy.

Otherwise systemd's MaxMemory setting is silently ignored.
---
 common-headless.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/common-headless.nix b/common-headless.nix
index 67963d0..e13d883 100644
--- a/common-headless.nix
+++ b/common-headless.nix
@@ -51,6 +51,8 @@
   virtualisation.lxd.recommendedSysctlSettings = true;
   virtualisation.lxc.lxcfs.enable = true;
 
+  systemd.enableUnifiedCgroupHierarchy = pkgs.lib.mkForce true;
+
   boot.kernel.sysctl = {
     "kernel.perf_event_paranoid" = "0";
     "kernel.kptr_restrict" = pkgs.lib.mkForce "0";