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| <chapter id="user-services-overview"> |
| <title>User Services Overview</title> |
| <para>In addition to the physical and logical infrastructure of your cloud |
| and the &PRODUCT; software and servers, you also need a layer of user |
| services so that people can actually make use of the cloud. This means |
| not just a user UI, but a set of options and resources that users can |
| choose from, such as templates for creating virtual machines, disk |
| storage, and more. If you are running a commercial service, you will be |
| keeping track of what services and resources users are consuming and |
| charging them for that usage. Even if you do not charge anything for |
| people to use your cloud – say, if the users are strictly internal to your |
| organization, or just friends who are sharing your cloud – you can still |
| keep track of what services they use and how much of them. |
| </para> |
| <section id="offerings-and-templates"> |
| <title>Service Offerings, Disk Offerings, Network Offerings, and Templates</title> |
| <para>A user creating a new instance can make a variety of choices about |
| its characteristics and capabilities. &PRODUCT; provides several ways to |
| present users with choices when creating a new instance: |
| </para> |
| <itemizedlist> |
| <listitem><para>Service Offerings, defined by the &PRODUCT; administrator, |
| provide a choice of CPU speed, number of CPUs, RAM size, tags on the |
| root disk, and other choices. See Creating a New Compute Offering.</para> |
| </listitem> |
| <listitem><para>Disk Offerings, defined by the &PRODUCT; administrator, |
| provide a choice of disk size and IOPS (Quality of Service) for primary |
| data storage. See Creating a New Disk Offering.</para> |
| </listitem> |
| <listitem><para>Network Offerings, defined by the &PRODUCT; administrator, |
| describe the feature set that is available to end users from the virtual |
| router or external networking devices on a given guest network. See |
| Network Offerings.</para> |
| </listitem> |
| <listitem><para>Templates, defined by the &PRODUCT; administrator or by |
| any &PRODUCT; user, are the base OS images that the user can choose |
| from when creating a new instance. For example, &PRODUCT; includes |
| CentOS as a template. See Working with Templates.</para> |
| </listitem> |
| </itemizedlist> |
| <para>In addition to these choices that are provided for users, there is |
| another type of service offering which is available only to the &PRODUCT; |
| root administrator, and is used for configuring virtual infrastructure |
| resources. For more information, see Upgrading a Virtual Router with |
| System Service Offerings. |
| </para> |
| </section> |
| </chapter> |