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