mirror of
https://github.com/apache/cloudstack.git
synced 2025-10-26 08:42:29 +01:00
47 lines
2.7 KiB
XML
47 lines
2.7 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
|
|
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
|
|
<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
|
|
%BOOK_ENTITIES;
|
|
]>
|
|
|
|
<!-- Licensed to the Apache Software Foundation (ASF) under one
|
|
or more contributor license agreements. See the NOTICE file
|
|
distributed with this work for additional information
|
|
regarding copyright ownership. The ASF licenses this file
|
|
to you under the Apache License, Version 2.0 (the
|
|
"License"); you may not use this file except in compliance
|
|
with the License. You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing,
|
|
software distributed under the License is distributed on an
|
|
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
KIND, either express or implied. See the License for the
|
|
specific language governing permissions and limitations
|
|
under the License.
|
|
-->
|
|
<section id="update-iso-vm">
|
|
<!-- CLOUDSTACK-667 -->
|
|
<title>Changing a VM's Base Image</title>
|
|
<para>Every VM is created from a base image, which is a template or ISO which has been created and
|
|
stored in &PRODUCT;. Both cloud administrators and end users can create and modify templates,
|
|
ISOs, and VMs.</para>
|
|
<para>In &PRODUCT;, you can change an existing VM's base image from one template to another,
|
|
or from one ISO to another. (You can not change from an ISO to a template, or from a
|
|
template to an ISO).</para>
|
|
<para>For example, suppose there is a
|
|
template based on a particular operating system, and the OS vendor releases a software patch.
|
|
The administrator or user naturally wants to apply the patch and then make sure existing VMs
|
|
start using it. Whether a software update is involved or not, it's also possible to simply
|
|
switch a VM from its current template to any other desired template.</para>
|
|
<para>To change a VM's base image, call the restoreVirtualMachine API command and pass in the
|
|
virtual machine ID and a new template ID. The template ID parameter may refer to either a
|
|
template or an ISO, depending on which type of base image the VM was already using (it must
|
|
match the previous type of image). When this call occurs, the VM's root disk is first destroyed,
|
|
then a new root disk is created from the source designated in the template ID parameter. The new
|
|
root disk is attached to the VM, and now the VM is based on the new template.</para>
|
|
<para>You can also omit the template ID parameter from the restoreVirtualMachine call. In this
|
|
case, the VM's root disk is destroyed and recreated, but from the same template or ISO that was
|
|
already in use by the VM.</para>
|
|
</section> |