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man: document nspawn's new --volatile switch
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of the container OS itself.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--volatile</option><replaceable>=MODE</replaceable></term>
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<listitem><para>Boots the container in
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volatile (ephemeral) mode. When no
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mode parameter is passed or when mode
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is specified as <literal>yes</literal>
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full volatile mode is enabled. This
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means the root directory is mounted as
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mostly unpopulated
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<literal>tmpfs</literal> instance, and
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<filename>/usr</filename> from the OS
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tree is mounted into it, read-only
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(the system thus starts up with
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read-only OS resources, but pristine
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state and configuration, any changes
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to the either are lost on
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shutdown). When the mode parameter is
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specified as <literal>state</literal>
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the OS tree is mounted read-only, but
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<filename>/var</filename> is mounted
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as <literal>tmpfs</literal> instance
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into it (the system thus starts up
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with read-only OS resources and
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configuration, but prestine state, any
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changes to the latter are lost on
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shutdown). When the mode parameter is
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specified as <literal>no</literal>
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(the default) the whole OS tree is made
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available writable.</para>
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<para>Note that setting this to
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<literal>yes</literal> or
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<literal>state</literal> will only
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work correctly with operating systems
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in the container that can boot up with
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only <filename>/usr</filename>
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mounted, and are able to populate
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<filename>/var</filename>
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automatically, as
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needed.</para></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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</variablelist>
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