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41 lines
2.2 KiB
XML
41 lines
2.2 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
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%BOOK_ENTITIES;
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]>
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<!-- Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<section id="update-iso-vm">
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<!-- CLOUDSTACK-667 -->
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<title>Changing a VM's Base Image</title>
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<para>Every VM is created from a base image, which is a template or ISO which has been
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created and stored in &PRODUCT;. Both cloud administrators and end users can create and
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modify templates, ISOs, and VMs.</para>
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<para>In &PRODUCT;, you can change an
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existing VM's base image. For example, suppose there is a template based
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on a particular operating system, and the OS vendor releases a software patch. The
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administrator or user naturally wants to apply the patch and then make sure existing VMs
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start using it. Whether a software update is involved or not, it's also possible to simply
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switch a VM from its current template to any other desired template.</para>
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<para>To change a VM's base image, call the restoreVirtualMachine API command and pass in the virtual machine
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ID and a new template ID. The template ID parameter may refer to either a template or an
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ISO. When this call occurs, the VM's root disk is first destroyed, then a new root disk is
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created from the source designated in the template ID parameter. The new root disk is
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attached to the VM, and now the VM is based on the new template.</para>
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</section> |