--- Begin Message ---
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Subject: |
[PATCH] services: nscd: Enable ‘passwd’ and ‘group’ caches by default. |
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Date: |
Thu, 16 May 2024 23:01:45 +0200 |
From: Ludovic Courtès <ludovic.courtes@inria.fr>
This allows users to specify NSS plugins such as LDAP via the
‘name-services’ field of <nscd-configuration>. Failing that, user code
will dlopen whatever passwd/group plugins are listed in
/etc/nsswitch.conf, which is likely to fail, typically because those are
not in $LD_LIBRARY_PATH.
* gnu/services/base.scm (%nscd-default-caches): Add ‘passwd’ and ‘group’
caches.
Change-Id: I9c03346a1de2710685f7801eccd2e08007427f5d
---
gnu/services/base.scm | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
Hi!
I realized by looking at ‘strace id’ that our nscd instance was replying
negatively to passwd and group lookups (to my surprise). Turns out we
need to explicitly enable caching of a database in nscd.conf if we want
nscd to honor lookups for that database.
We really need nscd to honor passwd/group lookups if we want to support
NSS plugins like LDAP or sss. (Now I realize that this is something
Jean-François et al. probably experienced with their OpenLDAP service
at <https://issues.guix.gnu.org/52578>.)
Thoughts?
Ludo’.
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 85160bd3abb..15f3807efcc 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -1340,7 +1340,22 @@ (define %nscd-default-caches
(positive-time-to-live (* 3600 24))
(negative-time-to-live 3600)
(check-files? #t) ;check /etc/services changes
- (persistent? #t))))
+ (persistent? #t))
+
+ ;; Enable minimal caching of the user databases, not so much for
+ ;; caching but rather to allow that uses of NSS plugins like LDAP
+ ;; don't lead user processes to dlopen them (which is likely to fail
+ ;; due to them not being found in $LD_LIBRARY_PATH).
+ (nscd-cache (database 'passwd)
+ (positive-time-to-live 600)
+ (negative-time-to-live 20)
+ (check-files? #t) ;check /etc/passwd changes
+ (persistent? #f))
+ (nscd-cache (database 'group)
+ (positive-time-to-live 600)
+ (negative-time-to-live 20)
+ (check-files? #t) ;check /etc/group changes
+ (persistent? #f))))
(define-deprecated %nscd-default-configuration
#f
base-commit: 58be9a79e2862d5fa9842d73f498ce2e5442b9ce
--
2.41.0
--- End Message ---
--- Begin Message ---
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Subject: |
Re: [bug#70992] [PATCH] services: nscd: Enable ‘passwd’ and ‘group’ caches by default. |
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Date: |
Mon, 03 Jun 2024 23:30:30 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) |
Ludovic Courtès <ludo@gnu.org> skribis:
> From: Ludovic Courtès <ludovic.courtes@inria.fr>
>
> This allows users to specify NSS plugins such as LDAP via the
> ‘name-services’ field of <nscd-configuration>. Failing that, user code
> will dlopen whatever passwd/group plugins are listed in
> /etc/nsswitch.conf, which is likely to fail, typically because those are
> not in $LD_LIBRARY_PATH.
>
> * gnu/services/base.scm (%nscd-default-caches): Add ‘passwd’ and ‘group’
> caches.
>
> Change-Id: I9c03346a1de2710685f7801eccd2e08007427f5d
Pushed as 85ac164c41fc4c93d3cb2a5d3321c63598c2855f.
Ludo’.
--- End Message ---