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46 lines
2.9 KiB
XML
46 lines
2.9 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE chapter 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-hosts">
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<title>About Hosts</title>
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<para>A host is a single computer. Hosts provide the computing resources that run the guest virtual machines. Each host has hypervisor software installed on it to manage the guest VMs. For example, a Linux KVM-enabled server, a Citrix XenServer server, and an ESXi server are hosts.</para>
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<para>The host is the smallest organizational unit within a &PRODUCT; deployment. Hosts are contained within clusters, clusters are contained within pods, and pods are contained within zones.</para>
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<para>Hosts in a &PRODUCT; deployment:</para>
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<itemizedlist>
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<listitem><para>Provde the CPU, memory, storage, and networking resources needed to host the virtual machines</para></listitem>
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<listitem><para>Interconnect using a high bandwidth TCP/IP network and connect to the Internet</para></listitem>
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<listitem><para>May reside in multiple data centers across different geographic locations</para></listitem>
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<listitem><para>May have different capacities (different CPU speeds, different amounts of RAM, etc.), although the hosts within a cluster must all be homogeneous</para></listitem>
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</itemizedlist>
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<para>Additional hosts can be added at any time to provide more capacity for guest VMs.</para>
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<para>&PRODUCT; automatically detects the amount of CPU and memory resources provided by the Hosts.</para>
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<para>Hosts are not visible to the end user. An end user cannot determine which host their guest has been assigned to.</para>
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<para>For a host to function in &PRODUCT;, you must do the following:</para>
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<itemizedlist>
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<listitem><para>Install hypervisor software on the host</para></listitem>
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<listitem><para>Assign an IP address to the host</para></listitem>
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<listitem><para>Ensure the host is connected to the &PRODUCT; Management Server</para></listitem>
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</itemizedlist>
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</section>
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