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Partial backport of the following Fedora Rawhide patches:
commit a747c093bbee95a3bdf1d7ef052bd248c95fadc5
Author: Florian Weimer <fweimer@redhat.com>
Date: Fri Jun 1 12:05:26 2018 +0200
Modernise nsswitch.conf defaults (#1581809)
(backported the line which adds sss description).
commit 82a97343d6405772541d754aeb4bab79612bd839
Author: Carlos O'Donell <carlos@redhat.com>
Date: Thu Feb 7 17:15:12 2019 -0500
Add warnings and notes to /etc/nsswitch.conf and /etc/nscd.conf.
(backported fully with adjustments for releng/nsswitch.conf).
diff --git a/nscd/nscd.conf b/nscd/nscd.conf
index 3730835c50a349c4..d7c0ee590466b0d4 100644
--- a/nscd/nscd.conf
+++ b/nscd/nscd.conf
@@ -3,6 +3,9 @@
#
# An example Name Service Cache config file. This file is needed by nscd.
#
+# WARNING: Running nscd with a secondary caching service like sssd may lead to
+# unexpected behaviour, especially with how long entries are cached.
+#
# Legal entries are:
#
# logfile <file>
@@ -22,7 +25,12 @@
# suggested-size <service> <prime number>
# check-files <service> <yes|no>
# persistent <service> <yes|no>
+#
# shared <service> <yes|no>
+# NOTE: Setting 'shared' to a value of 'yes' will accelerate the lookup
+# with the help of the client, but these lookups will not be
+# counted as cache hits i.e. 'nscd -g' may show '0%'.
+#
# max-db-size <service> <number bytes>
# auto-propagate <service> <yes|no>
#
diff --git a/releng/nsswitch.conf b/releng/nsswitch.conf
index 0a02e5717d906387..4b120bf9e6f94e5f 100644
--- a/releng/nsswitch.conf
+++ b/releng/nsswitch.conf
@@ -19,8 +19,11 @@
# db Use the local database (.db) files
# compat Use NIS on compat mode
# hesiod Use Hesiod for user lookups
+# sss Use sssd (System Security Services Daemon)
# [NOTFOUND=return] Stop searching if not found so far
#
+# WARNING: Running nscd with a secondary caching service like sssd may lead to
+# unexpected behaviour, especially with how long entries are cached.
# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases