100441efe6
Minor edits (found in the last release), including link and case correction, and service-name updates. Change-Id: I5410cf4b214800f9be433a513a320d69bc303208 Partial-Bug: #1121866
30 lines
2.0 KiB
XML
30 lines
2.0 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0"
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xml:id="lxc">
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<title>LXC (Linux containers)</title>
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<para>LXC (also known as Linux containers) is a virtualization technology that works at the
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operating system level. This is different from hardware virtualization, the approach used by
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other hypervisors such as KVM, Xen, and VMware. LXC (as currently implemented using libvirt in
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the Compute service) is not a secure virtualization technology for multi-tenant environments
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(specifically, containers may affect resource quotas for other containers hosted on the same
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machine). Additional containment technologies, such as AppArmor, may be used to provide better
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isolation between containers, although this is not the case by default. For all these reasons,
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the choice of this virtualization technology is not recommended in production.</para>
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<para>If your compute hosts do not have hardware support for virtualization, LXC will likely
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provide better performance than QEMU. In addition, if your guests must access specialized
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hardware, such as GPUs, this might be easier to achieve with LXC than other hypervisors.</para>
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<note><para>Some OpenStack Compute features might be missing when running with LXC as the hypervisor. See
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the <link xlink:href="http://wiki.openstack.org/HypervisorSupportMatrix">hypervisor support
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matrix</link> for details.</para></note>
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<para>To enable LXC, ensure the following options are set in
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<filename>/etc/nova/nova.conf</filename> on all hosts running the <systemitem class="service"
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>nova-compute</systemitem>
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service.<programlisting language="ini">compute_driver=libvirt.LibvirtDriver
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libvirt_type=lxc</programlisting></para>
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<para>On Ubuntu 12.04, enable LXC support in OpenStack by installing the
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<literal>nova-compute-lxc</literal> package.</para>
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</section>
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