|
 |
ec0bc1 |
From 900812481ed9f7bd425301399ab22196aa9d1324 Mon Sep 17 00:00:00 2001
|
|
|
ec0bc1 |
From: =?UTF-8?q?Nikola=20Forr=C3=B3?= <nforro@redhat.com>
|
|
|
ec0bc1 |
Date: Fri, 9 Jul 2021 17:45:37 +0200
|
|
|
ec0bc1 |
Subject: [PATCH 2/2] resolv.conf.5: update information about search list and
|
|
|
ec0bc1 |
attempt to clarify domain/search interaction
|
|
|
ec0bc1 |
|
|
|
ec0bc1 |
---
|
|
|
ec0bc1 |
man-pages/man5/resolv.conf.5 | 47 +++++++++++++++++++-----------------
|
|
|
ec0bc1 |
1 file changed, 25 insertions(+), 22 deletions(-)
|
|
|
ec0bc1 |
|
|
|
ec0bc1 |
diff --git a/man-pages/man5/resolv.conf.5 b/man-pages/man5/resolv.conf.5
|
|
|
ec0bc1 |
index 93c6b47..a14e0ca 100644
|
|
|
ec0bc1 |
--- a/man-pages/man5/resolv.conf.5
|
|
|
ec0bc1 |
+++ b/man-pages/man5/resolv.conf.5
|
|
|
ec0bc1 |
@@ -39,10 +39,9 @@ The configuration file is considered a trusted source of DNS information
|
|
|
ec0bc1 |
(e.g., DNSSEC AD-bit information will be returned unmodified from this
|
|
|
ec0bc1 |
source).
|
|
|
ec0bc1 |
.PP
|
|
|
ec0bc1 |
-If this file does not exist,
|
|
|
ec0bc1 |
-only the name server on the local machine will be queried;
|
|
|
ec0bc1 |
-the domain name is determined from the hostname
|
|
|
ec0bc1 |
-and the domain search path is constructed from the domain name.
|
|
|
ec0bc1 |
+If this file does not exist, only the name server on the local machine
|
|
|
ec0bc1 |
+will be queried, and the search list contains the local domain name
|
|
|
ec0bc1 |
+determined from the hostname.
|
|
|
ec0bc1 |
.PP
|
|
|
ec0bc1 |
The different configuration options are:
|
|
|
ec0bc1 |
.TP
|
|
|
ec0bc1 |
@@ -63,20 +62,15 @@ try the next, until out of name servers,
|
|
|
ec0bc1 |
then repeat trying all the name servers
|
|
|
ec0bc1 |
until a maximum number of retries are made.)
|
|
|
ec0bc1 |
.TP
|
|
|
ec0bc1 |
-\fBdomain\fP Local domain name.
|
|
|
ec0bc1 |
-Most queries for names within this domain can use short names
|
|
|
ec0bc1 |
-relative to the local domain.
|
|
|
ec0bc1 |
-If set to \(aq.\(aq, the root domain is considered.
|
|
|
ec0bc1 |
-If no \fBdomain\fP entry is present, the domain is determined
|
|
|
ec0bc1 |
-from the local hostname returned by
|
|
|
ec0bc1 |
-.BR gethostname (2);
|
|
|
ec0bc1 |
-the domain part is taken to be everything after the first \(aq.\(aq.
|
|
|
ec0bc1 |
-Finally, if the hostname does not contain a domain part, the root
|
|
|
ec0bc1 |
-domain is assumed.
|
|
|
ec0bc1 |
-.TP
|
|
|
ec0bc1 |
\fBsearch\fP Search list for host-name lookup.
|
|
|
ec0bc1 |
-The search list is normally determined from the local domain name;
|
|
|
ec0bc1 |
-by default, it contains only the local domain name.
|
|
|
ec0bc1 |
+By default, the search list contains one entry, the local domain name.
|
|
|
ec0bc1 |
+It is determined from the local hostname returned by
|
|
|
ec0bc1 |
+.BR gethostname (2);
|
|
|
ec0bc1 |
+the local domain name is taken to be everything after the first
|
|
|
ec0bc1 |
+\(aq.\(aq.
|
|
|
ec0bc1 |
+Finally, if the hostname does not contain a \(aq.\(aq, the
|
|
|
ec0bc1 |
+root domain is assumed as the local domain name.
|
|
|
ec0bc1 |
+.IP
|
|
|
ec0bc1 |
This may be changed by listing the desired domain search path
|
|
|
ec0bc1 |
following the \fIsearch\fP keyword with spaces or tabs separating
|
|
|
ec0bc1 |
the names.
|
|
|
ec0bc1 |
@@ -104,8 +98,21 @@ traffic if the servers for the listed domains are not local,
|
|
|
ec0bc1 |
and that queries will time out if no server is available
|
|
|
ec0bc1 |
for one of the domains.
|
|
|
ec0bc1 |
.IP
|
|
|
ec0bc1 |
-The search list is currently limited to six domains
|
|
|
ec0bc1 |
+If there are multiple
|
|
|
ec0bc1 |
+.B search
|
|
|
ec0bc1 |
+directives, only the search list from the last instance is used.
|
|
|
ec0bc1 |
+.IP
|
|
|
ec0bc1 |
+In glibc 2.25 and earlier, the search list is limited to six domains
|
|
|
ec0bc1 |
with a total of 256 characters.
|
|
|
ec0bc1 |
+Since glibc 2.26,
|
|
|
ec0bc1 |
+.\" glibc commit 3f853f22c87f0b671c0366eb290919719fa56c0e
|
|
|
ec0bc1 |
+the search list is unlimited.
|
|
|
ec0bc1 |
+.IP
|
|
|
ec0bc1 |
+The
|
|
|
ec0bc1 |
+.B domain
|
|
|
ec0bc1 |
+directive is an obsolete name for the
|
|
|
ec0bc1 |
+.B search
|
|
|
ec0bc1 |
+directive that handles one search list entry only.
|
|
|
ec0bc1 |
.TP
|
|
|
ec0bc1 |
\fBsortlist\fP
|
|
|
ec0bc1 |
This option allows addresses returned by
|
|
|
ec0bc1 |
@@ -312,10 +319,6 @@ in
|
|
|
ec0bc1 |
This option disables automatic reloading of a changed configuration file.
|
|
|
ec0bc1 |
.RE
|
|
|
ec0bc1 |
.PP
|
|
|
ec0bc1 |
-The \fIdomain\fP and \fIsearch\fP keywords are mutually exclusive.
|
|
|
ec0bc1 |
-If more than one instance of these keywords is present,
|
|
|
ec0bc1 |
-the last instance wins.
|
|
|
ec0bc1 |
-.PP
|
|
|
ec0bc1 |
The \fIsearch\fP keyword of a system's \fIresolv.conf\fP file can be
|
|
|
ec0bc1 |
overridden on a per-process basis by setting the environment variable
|
|
|
ec0bc1 |
.B LOCALDOMAIN
|
|
|
ec0bc1 |
--
|
|
|
ec0bc1 |
2.31.1
|
|
|
ec0bc1 |
|