nss: Use "files dns" as the default for the hosts database (bug 28700)

This matches what is currently in nss/nsswitch.conf.  The new ordering
matches what most distributions use in their installed configuration
files.

It is common to add localhost to /etc/hosts because the name does not
exist in the DNS, but is commonly used as a host name.

With the built-in "dns [!UNAVAIL=return] files" default, dns is
searched first and provides an answer for "localhost" (NXDOMAIN).
We never look at the files database as a result, so the contents of
/etc/hosts is ignored.  This means that "getent hosts localhost"
fail without a /etc/nsswitch.conf file, even though the host name
is listed in /etc/hosts.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/manual/nss.texi b/manual/nss.texi
index 3aaa7786f8..524d22ad1e 100644
--- a/manual/nss.texi
+++ b/manual/nss.texi
@@ -324,9 +324,8 @@ missing.
 
 @cindex default value, and NSS
 For the @code{hosts} and @code{networks} databases the default value is
-@code{dns [!UNAVAIL=return] files}.  I.e., the system is prepared for
-the DNS service not to be available but if it is available the answer it
-returns is definitive.
+@code{files dns}.  I.e., local configuration will override the contents
+of the domain name system (DNS).
 
 The @code{passwd}, @code{group}, and @code{shadow} databases was
 traditionally handled in a special way.  The appropriate files in the