man: networkd - clarify Address/Gateway keys in [Network] section

[elogind.git] / man / systemd-nspawn.xml

diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index 6264e48dbc9b69abf5310e3d6b0a59b355666b95..bec233c1ca9eb9c056df7dc72a385483b3de8a16 100644 (file)
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -123,10 +123,10 @@
                 see each other. The PID namespace separation of the
                 two containers is complete and the containers will
                 share very few runtime objects except for the
-                underlying file system. It is however possible to
-                enter an existing container, see
-                <link linkend='example-nsenter'>Example 4</link> below.
-                </para>
+                underlying file system. Use
+                <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
+                <command>login</command> command to request an
+                additional login prompt in a running container.</para>
 
                 <para><command>systemd-nspawn</command> implements the
                 <ulink
@@ -151,7 +151,7 @@
                 containers. We hence recommend turning it off entirely
                 by booting with <literal>audit=0</literal> on the
                 kernel command line, or by turning it off at kernel
-                build time. If auditing is enabled in the kernel
+                build time. If auditing is enabled in the kernel,
                 operating systems booted in an nspawn container might
                 refuse log-in attempts.</para>
         </refsect1>
@@ -192,7 +192,7 @@
 
                                 <listitem><para>Directory to use as
                                 file system root for the namespace
-                                container. If omitted the current
+                                container. If omitted, the current
                                 directory will be
                                 used.</para></listitem>
                         </varlistentry>
@@ -233,7 +233,7 @@
                                 host, and is used to initialize the
                                 container's hostname (which the
                                 container can choose to override,
-                                however). If not specified the last
+                                however). If not specified, the last
                                 component of the root directory of the
                                 container is used.</para></listitem>
                         </varlistentry>
@@ -303,12 +303,22 @@
                                 CAP_AUDIT_CONTROL.</para></listitem>
                         </varlistentry>
 
+                        <varlistentry>
+                                <term><option>--drop-capability=</option></term>
+
+                                <listitem><para>Specify one or more
+                                additional capabilities to drop for
+                                the container. This allows running the
+                                container with fewer capabilities than
+                                the default (see above).</para></listitem>
+                        </varlistentry>
+
                         <varlistentry>
                                 <term><option>--link-journal=</option></term>
 
                                 <listitem><para>Control whether the
                                 container's journal shall be made
-                                visible to the host system. If enabled
+                                visible to the host system. If enabled,
                                 allows viewing the container's journal
                                 files from the host (but not vice
                                 versa). Takes one of
@@ -370,6 +380,21 @@
                                 creates read-only bind
                                 mount.</para></listitem>
                         </varlistentry>
+
+                        <varlistentry>
+                                <term><option>--setenv=</option></term>
+
+                                <listitem><para>Specifies an
+                                environment variable assignment to
+                                pass to the init process in the
+                                container, in the format
+                                <literal>NAME=VALUE</literal>. This
+                                may be used to override the default
+                                variables or to set additional
+                                variables. This parameter may be used
+                                more than once.</para></listitem>
+                        </varlistentry>
+
                 </variablelist>
 
         </refsect1>
@@ -409,24 +434,29 @@
                 boots an OS in a namespace container in it.</para>
         </refsect1>
 
-        <refsect1 id='example-nsenter'>
+        <refsect1>
                 <title>Example 4</title>
 
-                <para>To enter the container, PID of one of the
-                processes sharing the new namespaces must be used.
-                <command>systemd-nspawn</command> prints the PID
-                (as viewed from the outside) of the launched process,
-                and it can be used to enter the container.</para>
+                <programlisting># mv ~/arch-tree /var/lib/container/arch
+# systemctl enable systemd-nspawn@arch.service
+# systemctl start systemd-nspawn@arch.service</programlisting>
+
+                <para>This makes the Arch Linux container part of the
+                <filename>multi-user.target</filename> on the host.
+                </para>
+        </refsect1>
+
+        <refsect1>
+                <title>Example 5</title>
 
-                <programlisting># nsenter -m -u -i -n -p -t $PID</programlisting>
+                <programlisting># btrfs subvolume snapshot / /.tmp
+# systemd-nspawn --private-network -D /.tmp -b</programlisting>
 
-                <para><citerefentry><refentrytitle>nsenter</refentrytitle><manvolnum>1</manvolnum></citerefentry>
-                is part of
-                <ulink url="https://github.com/karelzak/util-linux">util-linux</ulink>.
-                Kernel support for entering namespaces was added in
-                Linux 3.8.</para>
+                <para>This runs a copy of the host system in a
+                btrfs snapshot.</para>
         </refsect1>
 
+
         <refsect1>
                 <title>Exit status</title>
 
@@ -439,11 +469,11 @@
                 <para>
                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>chroot</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>unshare</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><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+                        <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                 </para>
         </refsect1>