Merge "Rephrase of sentence:Virtual Machine Image Guide"
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@ -10,30 +10,27 @@
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creation.</para>
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<section xml:id="oz">
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<title>Oz</title>
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<para><link
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xlink:href="https://github.com/clalancette/oz/wiki"
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>Oz</link> is a command-line tool that automates the
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process of creating a virtual machine image file. Oz is a
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Python app that interacts with KVM to step through the
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process of installing a virtual machine. It uses a
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predefined set of kickstart (Red Hat-based systems) and
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preseed files (Debian-based systems) for operating systems
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that it supports, and it can also be used to create
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Microsoft Windows images. On Fedora, install Oz with yum:<screen><prompt>#</prompt> <userinput>yum install oz</userinput></screen><note>
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<para>As of this writing, there are no Oz packages for
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Ubuntu, so you will need to either install from
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source or build your own .deb file.</para>
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<para><link xlink:href="https://github.com/clalancette/oz/wiki"
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>Oz</link> is a command-line tool that automates the process of
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creating a virtual machine image file. Oz is a Python app that
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interacts with KVM to step through the process of installing a
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virtual machine. It uses a predefined set of kickstart (Red
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Hat-based systems) and preseed files (Debian-based systems) for
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operating systems that it supports, and it can also be used to
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create Microsoft Windows images. On Fedora, install Oz with yum:<screen><prompt>#</prompt> <userinput>yum install oz</userinput></screen><note>
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<para>As of this writing, there are no Oz packages for Ubuntu,
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so you will need to either install from source or build your
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own .deb file.</para>
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</note></para>
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<para>A full treatment of Oz is beyond the scope of this
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document, but we will provide an example. You can find
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additional examples of Oz template files on GitHub at
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<link
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<para>A full treatment of Oz is beyond the scope of this document, but
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we will provide an example. You can find additional examples of Oz
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template files on GitHub at <link
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xlink:href="https://github.com/rackerjoe/oz-image-build/tree/master/templates"
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>rackerjoe/oz-image-build/templates</link>. Here's how
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you would create a CentOS 6.4 image with Oz.</para>
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>rackerjoe/oz-image-build/templates</link>. Here's how you would
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create a CentOS 6.4 image with Oz.</para>
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<para>Create a template file (we'll call it
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<filename>centos64.tdl</filename>) with the following
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contents. The only entry you will need to change is the
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<filename>centos64.tdl</filename>) with the following contents.
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The only entry you will need to change is the
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<literal><rootpw></literal>
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contents.<programlisting language="xml"><template>
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<name>centos64</name>
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@ -69,52 +66,44 @@ echo -n > /lib/udev/rules.d/75-persistent-net-generator.rules
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</commands>
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</template></programlisting>
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</para>
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<para>This Oz template specifies where to download the Centos
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6.4 install ISO. Oz will use the version information to
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identify which kickstart file to use. In this case, it
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will be <link
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<para>This Oz template specifies where to download the Centos 6.4
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install ISO. Oz will use the version information to identify which
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kickstart file to use. In this case, it will be <link
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xlink:href="https://github.com/clalancette/oz/blob/master/oz/auto/RHEL6.auto"
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>RHEL6.auto</link>. It adds EPEL as a repository and
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installs the <literal>epel-release</literal>,
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<literal>cloud-utils</literal>, and
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<literal>cloud-init</literal> packages, as specified
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in the <literal>packages</literal> section of the
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file.</para>
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<para>After Oz does the initial OS install using the kickstart
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file, it customizes the image by doing an update. It also
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removes any reference to the eth0 device that libvirt
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creates while Oz does the customizing, as specified
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in the <literal>command</literal> section of the XML
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>RHEL6.auto</link>. It adds EPEL as a repository and install the
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<literal>epel-release</literal>, <literal>cloud-utils</literal>,
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and <literal>cloud-init</literal> packages, as specified in the
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<literal>packages</literal> section of the file.</para>
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<para>After Oz does the initial OS install using the kickstart file, it
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updates the image's install packages with <command>yum
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update</command>. It also removes any reference to the eth0
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device that libvirt creates while Oz does the customizing, as
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specified in the <literal>command</literal> section of the XML
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file.</para>
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<para>To run this, do, as root:</para>
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<para><screen><prompt>#</prompt> <userinput>oz-install -d3 -u centos64.tdl -x centos64-libvirt.xml</userinput></screen><itemizedlist>
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<listitem>
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<para>The <literal>-d3</literal> flag tells Oz to
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show status information as it runs.</para>
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<para>The <literal>-d3</literal> flag tells Oz to show
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status information as it runs.</para>
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</listitem>
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<listitem>
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<para>The <literal>-u</literal> tells Oz to do the
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customization (install extra packages, run the
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commands) once it does the initial
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install.</para>
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customization (install extra packages, run the commands)
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once it does the initial install.</para>
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</listitem>
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<listitem>
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<para>The <literal>-x <filename></literal> flag
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tells Oz what filename to use to write out a
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libvirt XML file (otherwise it will default to
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something like
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<para>The <literal>-x <filename></literal> flag tells Oz
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what filename to use to write out a libvirt XML file
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(otherwise it will default to something like
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<filename>centos64Apr_03_2013-12:39:42</filename>).</para>
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</listitem>
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</itemizedlist>If you leave out the <literal>-u</literal>
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flag, or you want to edit the file to do additional
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customizations, you can use the
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<command>oz-customize</command> command, using the
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libvirt XML file that <command>oz-install</command>
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creates. For example:
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</itemizedlist>If you leave out the <literal>-u</literal> flag, or
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you want to edit the file to do additional customizations, you can
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use the <command>oz-customize</command> command, using the libvirt
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XML file that <command>oz-install</command> creates. For example:
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<screen><prompt>#</prompt> <userinput>oz-customize -d3 centos64.tdl centos64-libvirt.xml</userinput></screen>
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Oz will invoke libvirt to boot the image inside of KVM,
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then Oz will ssh into the instance and perform the
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customizations.</para>
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Oz will invoke libvirt to boot the image inside of KVM, then Oz will
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ssh into the instance and perform the customizations.</para>
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</section>
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<section xml:id="vmbuilder">
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<title>VMBuilder</title>
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