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man/systemd-nspawn: fix indentation and parenthesis location
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Zbigniew Jędrzejewski-Szmek
parent
5811490a3f
commit
730bdfed81
@ -1545,8 +1545,9 @@ After=sys-subsystem-net-devices-ens1.device</programlisting>
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with a focus on implementing stateless operating system images.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect2><refsect2>
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<refsect2>
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<title>Input/Output Options</title>
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<variablelist>
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@ -1592,57 +1593,57 @@ After=sys-subsystem-net-devices-ens1.device</programlisting>
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</varlistentry>
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</variablelist>
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</refsect2><refsect2>
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<title>Credentials</title>
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</refsect2>
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<refsect2>
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<title>Credentials</title>
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<variablelist>
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<varlistentry>
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<term><option>--load-credential=</option><replaceable>ID</replaceable>:<replaceable>PATH</replaceable></term>
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<term><option>--set-credential=</option><replaceable>ID</replaceable>:<replaceable>VALUE</replaceable></term>
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<variablelist>
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<varlistentry>
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<term><option>--load-credential=</option><replaceable>ID</replaceable>:<replaceable>PATH</replaceable></term>
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<term><option>--set-credential=</option><replaceable>ID</replaceable>:<replaceable>VALUE</replaceable></term>
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<listitem><para>Pass a credential to the container. These two options correspond to the
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<varname>LoadCredential=</varname> and <varname>SetCredential=</varname> settings in unit files. See
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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details about these concepts, as well as the syntax of the option's arguments.</para>
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<listitem><para>Pass a credential to the container. These two options correspond to the
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<varname>LoadCredential=</varname> and <varname>SetCredential=</varname> settings in unit files. See
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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details about these concepts, as well as the syntax of the option's arguments.</para>
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<para>Note: when <command>systemd-nspawn</command> runs as systemd system service it can propagate
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the credentials it received via <varname>LoadCredential=</varname>/<varname>SetCredential=</varname>
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to the container payload. A systemd service manager running as PID 1 in the container can further
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propagate them to the services it itself starts. It is thus possible to easily propagate credentials
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from a parent service manager to a container manager service and from there into its payload. This
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can even be done recursively.</para>
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<para>Note: when <command>systemd-nspawn</command> runs as systemd system service it can propagate
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the credentials it received via <varname>LoadCredential=</varname>/<varname>SetCredential=</varname>
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to the container payload. A systemd service manager running as PID 1 in the container can further
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propagate them to the services it itself starts. It is thus possible to easily propagate credentials
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from a parent service manager to a container manager service and from there into its payload. This
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can even be done recursively.</para>
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<para>In order to embed binary data into the credential data for <option>--set-credential=</option>
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use C-style escaping (i.e. <literal>\n</literal> to embed a newline, or <literal>\x00</literal> to
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embed a <constant>NUL</constant> byte. Note that the invoking shell might already apply unescaping
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once, hence this might require double escaping!).</para>
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<para>In order to embed binary data into the credential data for <option>--set-credential=</option>,
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use C-style escaping (i.e. <literal>\n</literal> to embed a newline, or <literal>\x00</literal> to
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embed a <constant>NUL</constant> byte). Note that the invoking shell might already apply unescaping
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once, hence this might require double escaping!.</para>
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<para>The
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<citerefentry><refentrytitle>systemd-sysusers.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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and
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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services read credentials configured this way for the purpose of configuring the container's root
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user's password and shell, as well as system locale, keymap and timezone during the first boot
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process of the container. This is particularly useful in combination with
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<option>--volatile=yes</option> where every single boot appears as first boot, since configuration
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applied to <filename>/etc/</filename> is lost on container reboot cycles. See the respective man
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pages for details. Example:</para>
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<para>The
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<citerefentry><refentrytitle>systemd-sysusers.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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and
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<citerefentry><refentrytitle>systemd-firstboot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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services read credentials configured this way for the purpose of configuring the container's root
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user's password and shell, as well as system locale, keymap and timezone during the first boot
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process of the container. This is particularly useful in combination with
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<option>--volatile=yes</option> where every single boot appears as first boot, since configuration
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applied to <filename>/etc/</filename> is lost on container reboot cycles. See the respective man
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pages for details. Example:</para>
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<programlisting># systemd-nspawn -i image.raw \
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--volatile=yes \
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--set-credential=firstboot.locale:de_DE.UTF-8 \
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--set-credential=passwd.hashed-password.root:'$y$j9T$yAuRJu1o5HioZAGDYPU5d.$F64ni6J2y2nNQve90M/p0ZP0ECP/qqzipNyaY9fjGpC' \
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-b</programlisting>
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<programlisting># systemd-nspawn -i image.raw \
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--volatile=yes \
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--set-credential=firstboot.locale:de_DE.UTF-8 \
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--set-credential=passwd.hashed-password.root:'$y$j9T$yAuRJu1o5HioZAGDYPU5d.$F64ni6J2y2nNQve90M/p0ZP0ECP/qqzipNyaY9fjGpC' \
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-b</programlisting>
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<para>The above command line will invoke the specified image file <filename>image.raw</filename> in
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volatile mode, i.e. with empty <filename>/etc/</filename> and <filename>/var/</filename>. The
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container payload will recognize this as a first boot, and will invoke
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<filename>systemd-firstboot.service</filename>, which then reads the two passed credentials to
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configure the system's initial locale and root password.</para>
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</listitem>
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<para>The above command line will invoke the specified image file <filename>image.raw</filename> in
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volatile mode, i.e. with empty <filename>/etc/</filename> and <filename>/var/</filename>. The
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container payload will recognize this as a first boot, and will invoke
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<filename>systemd-firstboot.service</filename>, which then reads the two passed credentials to
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configure the system's initial locale and root password.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</variablelist>
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</refsect2><refsect2>
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<title>Other</title>
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