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man: move "files" after "resolve" in the suggested configuration

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resolved caches files, so we should move nss-files after nss-resolve
to speed up local access (and yes, people like to have thousands of
lines in /etc/hosts).

See https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/LCX6YXLM62QEYJSOLJBWXXVXTZVL73GI/
for the background.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2020-04-15 18:05:39 +02:00
parent 3cfb7cc507
commit 44b7aedbde
4 changed files with 13 additions and 12 deletions
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2
man/nss-myhostname.xml
View File

@ -83,7 +83,7 @@
group: compat mymachines systemd
shadow: compat
hosts: files mymachines resolve [!UNAVAIL=return] dns <command>myhostname</command>
hosts: mymachines resolve [!UNAVAIL=return] files dns <command>myhostname</command>
networks: files
protocols: db files

2
man/nss-mymachines.xml
View File

@ -69,7 +69,7 @@
group: compat <command>mymachines</command> systemd
shadow: compat
hosts: files <command>mymachines</command> resolve [!UNAVAIL=return] dns myhostname
hosts: <command>mymachines</command> resolve [!UNAVAIL=return] files dns myhostname
networks: files
protocols: db files

19
man/nss-resolve.xml
View File

@ -34,14 +34,15 @@
name resolution service. It replaces the <command>nss-dns</command> plug-in module that traditionally resolves
hostnames via DNS.</para>
<para>To activate the NSS module, add <literal>resolve</literal> to the line starting with
<literal>hosts:</literal> in <filename>/etc/nsswitch.conf</filename>. Specifically, it is recommended to place
<literal>resolve</literal> early in <filename>/etc/nsswitch.conf</filename>'s <literal>hosts:</literal> line (but
after the <literal>files</literal> or <literal>mymachines</literal> entries), right before the
<literal>dns</literal> entry if it exists, followed by <literal>[!UNAVAIL=return]</literal>, to ensure DNS queries
are always routed via
<citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry> if it is
running, but are routed to <command>nss-dns</command> if this service is not available.</para>
<para>To activate the NSS module, add <literal>resolve [!UNAVAIL=return]</literal> to the line starting
with <literal>hosts:</literal> in <filename>/etc/nsswitch.conf</filename>. Specifically, it is
recommended to place <literal>resolve</literal> early in <filename>/etc/nsswitch.conf</filename>'s
<literal>hosts:</literal> line. It should be before the <literal>files</literal> entry, since
<filename>systemd-resolved</filename> supports <filename>/etc/hosts</filename> internally, but with
caching. To the contrary, it should be after <literal>mymachines</literal>, to give hostnames given to
local VMs and containers precedence over names received over DNS. Finally, we recommend placing
<literal>dns</literal> somewhere after <literal>resolve</literal>, to fall back to
<command>nss-dns</command> if <filename>systemd-resolved.service</filename> is not available.</para>
<para>Note that <command>systemd-resolved</command> will synthesize DNS resource
records in a few cases, for example for <literal>localhost</literal> and the
@ -66,7 +67,7 @@
group: compat mymachines systemd
shadow: compat
hosts: files mymachines <command>resolve [!UNAVAIL=return]</command> dns myhostname
hosts: mymachines <command>resolve [!UNAVAIL=return]</command> files dns myhostname
networks: files
protocols: db files

2
man/nss-systemd.xml
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@ -65,7 +65,7 @@
group: compat [SUCCESS=merge] mymachines [SUCCESS=merge] <command>systemd</command>
shadow: compat
hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname
hosts: mymachines resolve [!UNAVAIL=return] files dns myhostname
networks: files
protocols: db files