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authorLennart Poettering <lennart@poettering.net>2016-02-23 18:24:03 +0100
committerLennart Poettering <lennart@poettering.net>2016-02-23 18:26:35 +0100
commit9053aaad4255a1d01a50f8e44784cd7eebe8f95c (patch)
treed1692fca63166065b9e6e9c56715f509a5b9e1df /man/nss-resolve.xml
parent45bd4854540ae50586e6bfcef5a153c4c1e2aca7 (diff)
man: change recommended order of NSS modules in /etc/nsswitch.conf
So far we recommended placing "nss-mymachines" after "nss-resolve" in the order of preference in /etc/nsswitch.conf. This change reverse this order. Rationale: single-label names are resolved via LLMNR by resolved, which has to time out if no peer by that name exists. By placing "nss-mymachines" first (which always responds immediately) we avoid running into this timeout for most containers. Both modules should return the same data if LLMNR is used by the container anyway. While we are at it, improve the man pages of the three NSS modules in other ways a bit.
Diffstat (limited to 'man/nss-resolve.xml')
-rw-r--r--man/nss-resolve.xml45
1 files changed, 19 insertions, 26 deletions
diff --git a/man/nss-resolve.xml b/man/nss-resolve.xml
index 8b0928145f..d9e56453e8 100644
--- a/man/nss-resolve.xml
+++ b/man/nss-resolve.xml
@@ -56,37 +56,36 @@
<refsect1>
<title>Description</title>
- <para><command>nss-resolve</command> is a plugin module for the
- GNU Name Service Switch (NSS) functionality of the GNU C Library
- (<command>glibc</command>) enabling it to resolve host names via
- the
- <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- local network name resolution service.</para>
-
- <para>To activate the NSS module, <literal>resolve</literal>
- has to be added to the line starting with
- <literal>hosts:</literal> in
- <filename>/etc/nsswitch.conf</filename>.</para>
-
- <para>It is recommended to place <literal>resolve</literal> early
- in the <filename>nsswitch.conf</filename> line (but after the
- <literal>files</literal> entry), replacing the
- <literal>dns</literal> entry if it exists, to ensure DNS queries
- are always routed via
+ <para><command>nss-resolve</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the
+ GNU C Library (<command>glibc</command>) enabling it to resolve host names via the
+ <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry> local network
+ 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>.</para>
+
+ <para>It is recommended to place <literal>resolve</literal> early in <filename>/etc/nsswitch.conf</filename>'
+ <literal>hosts:</literal> line (but after the <literal>files</literal> or <literal>mymachines</literal> entries),
+ replacing the <literal>dns</literal> entry if it exists, to ensure DNS queries are always routed via
<citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+
+ <para>Note that <command>nss-resolve</command> will chain-load <command>nss-dns</command> if
+ <filename>systemd-resolved.service</filename> is not running, ensuring that basic DNS resolution continues to work
+ if the service is down.</para>
</refsect1>
<refsect1>
<title>Example</title>
- <para>Here is an example <filename>/etc/nsswitch.conf</filename>
- file that enables <command>resolve</command> correctly:</para>
+ <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables <command>nss-resolve</command>
+ correctly:</para>
<programlisting>passwd: compat mymachines
group: compat mymachines
shadow: compat
-hosts: files <command>resolve</command> mymachines myhostname
+hosts: files mymachines <command>resolve</command> myhostname
networks: files
protocols: db files
@@ -96,12 +95,6 @@ rpc: db files
netgroup: nis</programlisting>
- <para>Note that <command>nss-resolve</command> will chain-load
- <command>nss-dns</command> if
- <filename>systemd-resolved.service</filename> is not running,
- ensuring that basic DNS resolution continues to work if the
- service is down.</para>
-
</refsect1>
<refsect1>