X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=man%2Fsystemd-nspawn.xml;h=820a79bc286c53f61dfe1d686373af87b5aaf70a;hp=950558feec085c53193ab3c2f933a09fa9af51c9;hb=631b9deefbef76c5f69b165f33cb46690c938c95;hpb=5ae4d543cb9b45ad6c6b82b78da1d6abc2291cdb

diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index 950558fee..820a79bc2 100644
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -70,7 +70,7 @@
                 <para><command>systemd-nspawn</command> may be used to
                 run a command or OS in a light-weight namespace
                 container. In many ways it is similar to
-                <citerefentry><refentrytitle>chroot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+                <citerefentry project='man-pages'><refentrytitle>chroot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                 but more powerful since it fully virtualizes the file
                 system hierarchy, as well as the process tree, the
                 various IPC subsystems and the host and domain
@@ -98,15 +98,15 @@
                 involved with boot and systems management.</para>
 
                 <para>In contrast to
-                <citerefentry><refentrytitle>chroot</refentrytitle><manvolnum>1</manvolnum></citerefentry> <command>systemd-nspawn</command>
+                <citerefentry project='man-pages'><refentrytitle>chroot</refentrytitle><manvolnum>1</manvolnum></citerefentry> <command>systemd-nspawn</command>
                 may be used to boot full Linux-based operating systems
                 in a container.</para>
 
                 <para>Use a tool like
-                <citerefentry><refentrytitle>yum</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-                <citerefentry><refentrytitle>debootstrap</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                <citerefentry project='die-net'><refentrytitle>yum</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                <citerefentry project='die-net'><refentrytitle>debootstrap</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                 or
-                <citerefentry><refentrytitle>pacman</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+                <citerefentry project='arch'><refentrytitle>pacman</refentrytitle><manvolnum>8</manvolnum></citerefentry>
                 to set up an OS directory tree suitable as file system
                 hierarchy for <command>systemd-nspawn</command>
                 containers.</para>
@@ -393,7 +393,7 @@
                                 additional capabilities to grant the
                                 container. Takes a comma-separated
                                 list of capability names, see
-                                <citerefentry><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+                                <citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
                                 for more information. Note that the
                                 following capabilities will be granted
                                 in any way: CAP_CHOWN,
@@ -581,7 +581,7 @@
                                 accessible via
                                 <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                                 and shown by tools such as
-                                <citerefentry><refentrytitle>ps</refentrytitle><manvolnum>1</manvolnum></citerefentry>. If
+                                <citerefentry project='man-pages'><refentrytitle>ps</refentrytitle><manvolnum>1</manvolnum></citerefentry>. If
                                 the container does not run an init
                                 system, it is recommended to set this
                                 option to <literal>no</literal>. Note
@@ -644,6 +644,49 @@
                                 of the container OS itself.</para></listitem>
                         </varlistentry>
 
+                        <varlistentry>
+                                <term><option>--volatile</option><replaceable>=MODE</replaceable></term>
+
+                                <listitem><para>Boots the container in
+                                volatile (ephemeral) mode. When no
+                                mode parameter is passed or when mode
+                                is specified as <literal>yes</literal>
+                                full volatile mode is enabled. This
+                                means the root directory is mounted as
+                                mostly unpopulated
+                                <literal>tmpfs</literal> instance, and
+                                <filename>/usr</filename> from the OS
+                                tree is mounted into it, read-only
+                                (the system thus starts up with
+                                read-only OS resources, but pristine
+                                state and configuration, any changes
+                                to the either are lost on
+                                shutdown). When the mode parameter is
+                                specified as <literal>state</literal>
+                                the OS tree is mounted read-only, but
+                                <filename>/var</filename> is mounted
+                                as <literal>tmpfs</literal> instance
+                                into it (the system thus starts up
+                                with read-only OS resources and
+                                configuration, but pristine state, any
+                                changes to the latter are lost on
+                                shutdown). When the mode parameter is
+                                specified as <literal>no</literal>
+                                (the default) the whole OS tree is made
+                                available writable.</para>
+
+                                <para>Note that setting this to
+                                <literal>yes</literal> or
+                                <literal>state</literal> will only
+                                work correctly with operating systems
+                                in the container that can boot up with
+                                only <filename>/usr</filename>
+                                mounted, and are able to populate
+                                <filename>/var</filename>
+                                automatically, as
+                                needed.</para></listitem>
+                        </varlistentry>
+
                         <xi:include href="standard-options.xml" xpointer="help" />
                         <xi:include href="standard-options.xml" xpointer="version" />
                 </variablelist>
@@ -727,10 +770,10 @@
                 <title>See Also</title>
                 <para>
                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>chroot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>yum</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>debootstrap</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>pacman</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                        <citerefentry project='man-pages'><refentrytitle>chroot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+                        <citerefentry project='die-net'><refentrytitle>yum</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                        <citerefentry project='die-net'><refentrytitle>debootstrap</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                        <citerefentry project='arch'><refentrytitle>pacman</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                 </para>