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57 lines
3.7 KiB
XML
57 lines
3.7 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="about-zones">
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<title>About Zones</title>
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<para>A zone is the second largest organizational unit within a &PRODUCT; deployment. A zone
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typically corresponds to a single datacenter, although it is permissible to have multiple
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zones in a datacenter. The benefit of organizing infrastructure into zones is to provide
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physical isolation and redundancy. For example, each zone can have its own power supply and
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network uplink, and the zones can be widely separated geographically (though this is not
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required).</para>
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<para>A zone consists of:</para>
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<itemizedlist>
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<listitem><para>One or more pods. Each pod contains one or more clusters of hosts and one or more primary storage servers.</para></listitem>
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<listitem><para>Secondary storage, which is shared by all the pods in the zone.</para></listitem>
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</itemizedlist>
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<mediaobject>
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<imageobject>
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<imagedata fileref="./images/zone-overview.png" />
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</imageobject>
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<textobject><phrase>zone-overview.png: Nested structure of a simple zone.</phrase></textobject>
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</mediaobject>
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<para>Zones are visible to the end user. When a user starts a guest VM, the user must select a zone for their guest. Users might also be required to copy their private templates to additional zones to enable creation of guest VMs using their templates in those zones.</para>
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<para>Zones can be public or private. Public zones are visible to all users. This means that any user may create a guest in that zone. Private zones are reserved for a specific domain. Only users in that domain or its subdomains may create guests in that zone.</para>
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<para>Hosts in the same zone are directly accessible to each other without having to go through a firewall. Hosts in different zones can access each other through statically configured VPN tunnels.</para>
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<para>For each zone, the administrator must decide the following.</para>
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<itemizedlist>
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<listitem><para>How many pods to place in a zone.</para></listitem>
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<listitem><para>How many clusters to place in each pod.</para></listitem>
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<listitem><para>How many hosts to place in each cluster.</para></listitem>
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<listitem><para>How many primary storage servers to place in each cluster and total capacity for the storage servers.</para></listitem>
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<listitem><para>How much secondary storage to deploy in a zone.</para></listitem>
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</itemizedlist>
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<para>When you add a new zone using the &PRODUCT; UI, you will be prompted to configure the zone’s physical network
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and add the first pod, cluster, host, primary storage, and secondary storage.</para>
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</section>
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