From 5591f2f4bd658216d3fe8f399e48be596f375e98 Mon Sep 17 00:00:00 2001
From: Florian Sesser <florian@leastauthority.com>
Date: Tue, 24 Sep 2024 15:14:48 +0000
Subject: [PATCH] Limit journald disk usage on machines that ship logs away
---
nixos/modules/monitoring/exporters/promtail.nix | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/nixos/modules/monitoring/exporters/promtail.nix b/nixos/modules/monitoring/exporters/promtail.nix
index 8c408034..75994b68 100644
--- a/nixos/modules/monitoring/exporters/promtail.nix
+++ b/nixos/modules/monitoring/exporters/promtail.nix
@@ -47,6 +47,12 @@ in {
# for further details about these options.
#
MaxFileSec=1day
+
+ # This asks journald to not use more than 500M of disk space. Due to
+ # journald's characteristics this might only be a week of logs, but that
+ # should be okay since we ship all logs to a central server that keeps
+ # them for a while longer.
+ SystemMaxUse=500M
'';
services.promtail.configuration = {
--
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