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doc: clarify the behavior of unopenable listen_addresses

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Reported-by: Gurjeet Singh

Discussion: https://postgr.es/m/CABwTF4WYPD9ov-kcSq1+J+ZJ5wYDQLXquY6Lu2cvb-Y7pTpSGA@mail.gmail.com

Backpatch-through: 11
This commit is contained in:
Bruce Momjian 2023-09-26 19:02:18 -04:00
parent 29dec9f043
commit cf93f173c1
1 changed files with 7 additions and 2 deletions
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9
doc/src/sgml/config.sgml
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@ -656,10 +656,15 @@ include_dir 'conf.d'
<literal>::</literal> allows listening for all IPv6 addresses. <literal>::</literal> allows listening for all IPv6 addresses.
If the list is empty, the server does not listen on any IP interface If the list is empty, the server does not listen on any IP interface
at all, in which case only Unix-domain sockets can be used to connect at all, in which case only Unix-domain sockets can be used to connect
to it. to it. If the list is not empty, the server will start if it
can listen on at least one TCP/IP address. A warning will be
emitted for any TCP/IP address which cannot be opened.
The default value is <systemitem class="systemname">localhost</systemitem>, The default value is <systemitem class="systemname">localhost</systemitem>,
which allows only local TCP/IP <quote>loopback</quote> connections to be which allows only local TCP/IP <quote>loopback</quote> connections to be
made. While client authentication (<xref made.
</para>
<para>
While client authentication (<xref
linkend="client-authentication"/>) allows fine-grained control linkend="client-authentication"/>) allows fine-grained control
over who can access the server, <varname>listen_addresses</varname> over who can access the server, <varname>listen_addresses</varname>
controls which interfaces accept connection attempts, which controls which interfaces accept connection attempts, which