From c96ba2cf5efc0ee5c10f0a49aeaa9a45a84de7ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Wed, 10 Feb 2016 21:21:38 +0100
Subject: [PATCH] install: Do not cache lookup failures.
Possibly fixes <http://bugs.gnu.org/22209>.
* gnu/system/install.scm (%nscd-minimal-caches)[negative-time-to-live]:
Set to zero.
---
gnu/system/install.scm | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/gnu/system/install.scm b/gnu/system/install.scm
index 0cfc8fa5c91..6cde6499954 100644
--- a/gnu/system/install.scm
+++ b/gnu/system/install.scm
@@ -237,7 +237,12 @@ (define %nscd-minimal-caches
;; Minimal in-memory caching policy for nscd.
(list (nscd-cache (database 'hosts)
(positive-time-to-live (* 3600 12))
- (negative-time-to-live 20)
+
+ ;; Do not cache lookup failures at all since they are
+ ;; quite likely (for instance when someone tries to ping a
+ ;; host before networking is functional.)
+ (negative-time-to-live 0)
+
(persistent? #f)
(max-database-size (* 5 (expt 2 20)))))) ;5 MiB
--
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