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7f95145833
Commit 69fe23ff added checking for the older docbook2man back into
configure, but this breaks building the docs on at least Oracle Linux and
Fedora when docbook2X is not installed as docbook2man will be found but the
docs don't actually build with that tool.
This change makes it so the docs can be built with either the older
docbook2man or the newer 2X tools by using configure to set the dtd
string to an appropriate value depending on use of docbook2man or
db2x_docbook2man.
Also fixed a small error in lxc-destroy.sgml.in that was noticed
by the old tools.
Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
162 lines
4.3 KiB
Plaintext
162 lines
4.3 KiB
Plaintext
<!--
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lxc: linux Container library
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(C) Copyright IBM Corp. 2007, 2008
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Authors:
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Daniel Lezcano <daniel.lezcano at free.fr>
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Serge Hallyn <serge.hallyn at ubuntu.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-->
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<!DOCTYPE refentry PUBLIC @docdtd@ [
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<!ENTITY commonoptions SYSTEM "@builddir@/common_options.sgml">
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<!ENTITY seealso SYSTEM "@builddir@/see_also.sgml">
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]>
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<refentry>
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<docinfo><date>@LXC_GENERATE_DATE@</date></docinfo>
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<refmeta>
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<refentrytitle>lxc-unshare</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>lxc-unshare</refname>
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<refpurpose>
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Run a task in a new set of namespaces.
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</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>lxc-unshare</command>
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<arg choice="req">-s <replaceable>namespaces</replaceable></arg>
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<arg choice="req">-u <replaceable>user</replaceable></arg>
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<arg choice="req">command</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>lxc-unshare</command> can be used to run a task in a cloned set
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of namespaces. This command is mainly provided for testing purposes.
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Despite its name, it always uses clone rather than unshare to create
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the new task with fresh namespaces. Apart from testing kernel
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regressions this should make no difference.
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<variablelist>
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<varlistentry>
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<term>
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<option>-s <replaceable>namespaces</replaceable></option>
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</term>
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<listitem>
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<para>
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Specify the namespaces to attach to, as a pipe-separated list,
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e.g. <replaceable>NETWORK|IPC</replaceable>. Allowed values are
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<replaceable>MOUNT</replaceable>, <replaceable>PID</replaceable>,
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<replaceable>UTSNAME</replaceable>, <replaceable>IPC</replaceable>,
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<replaceable>USER </replaceable> and
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<replaceable>NETWORK</replaceable>. This allows one to change
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the context of the process to e.g. the network namespace of the
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container while retaining the other namespaces as those of the
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host.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-u <replaceable>user</replaceable></option>
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</term>
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<listitem>
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<para>
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Specify a user which the new task should become. This option is
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only valid if a user namespace is unshared.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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To spawn a new shell with its own UTS (hostname) namespace,
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<programlisting>
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lxc-unshare -s UTSNAME /bin/bash
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</programlisting>
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If the hostname is changed in that shell, the change will not be
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reflected on the host.
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</para>
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<para>
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To spawn a shell in a new network, pid, and mount namespace,
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<programlisting>
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lxc-unshare -s "NETWORK|PID|MOUNT" /bin/bash
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</programlisting>
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The resulting shell will have pid 1 and will see no network interfaces.
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After re-mounting /proc in that shell,
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<programlisting>
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mount -t proc proc /proc
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</programlisting>
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ps output will show there are no other processes in the namespace.
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</para>
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</refsect1>
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&seealso;
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<refsect1>
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<title>Author</title>
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<para>Daniel Lezcano <email>daniel.lezcano@free.fr</email></para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:2
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sgml-indent-data:t
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sgml-parent-document:nil
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sgml-default-dtd-file:nil
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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-->
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