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| <?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="vr-monitor"> | ||
| <title>Service Monitoring Tool for Virtual Router</title> | ||
| <para>Various services running on the &PRODUCT; virtual routers can be monitored by using a | ||
| Service Monitoring tool. The tool ensures that services are successfully running until &PRODUCT; | ||
| deliberately disables them. If a service goes down, the tool automatically restarts the VR, and | ||
| if that does not bring up the VR, an alert as well as an event is generated indicating the | ||
| failure.</para> | ||
| <para>Monitoring tool can help to start a VR service, which is crashed due to an unexpected | ||
| reason. For example:</para> | ||
| <itemizedlist> | ||
| <listitem> | ||
| <para>The services crashed due to defects in the source code.</para> | ||
| </listitem> | ||
| <listitem> | ||
| <para>The services that are terminated by the OS when memory or CPU is not sufficiently | ||
| available for the service.</para> | ||
| </listitem> | ||
| </itemizedlist> | ||
| <note> | ||
| <para>Only those services with daemons are monitored. The services that are failed due to errors in the service/daemon configuration file cannot | ||
| be restarted by the Monitoring tool.</para> | ||
| </note> | ||
| <para>The following services are monitored in a VR:</para> | ||
| <itemizedlist> | ||
| <listitem> | ||
| <para>DNS</para> | ||
| </listitem> | ||
| <listitem> | ||
| <para>HA Proxy</para> | ||
| </listitem> | ||
| <listitem> | ||
| <para>SSH</para> | ||
| </listitem> | ||
| <listitem> | ||
| <para>Apache Web Server</para> | ||
| </listitem> | ||
| </itemizedlist> | ||
| <para>The following networks are supported:</para> | ||
| <itemizedlist> | ||
| <listitem> | ||
| <para>Isolated Networks</para> | ||
| </listitem> | ||
| <listitem> | ||
| <para>Shared Networks in both Advanced and Basic zone</para> | ||
| </listitem> | ||
| </itemizedlist> | ||
| <para>The following table lists down various scenarios for virtual router and corresponding | ||
| actions taken by &PRODUCT;.</para> | ||
| <informaltable> | ||
| <tgroup cols="2" align="left" colsep="1" rowsep="1"> | ||
| <colspec colwidth="1.0*" colname="1" colnum="1"/> | ||
| <colspec colwidth="9.87*" colname="2" colnum="2"/> | ||
| <thead> | ||
| <row> | ||
| <entry><para>Scenarios</para></entry> | ||
| <entry><para>Action Taken by &PRODUCT;</para></entry> | ||
| </row> | ||
| </thead> | ||
| <tbody> | ||
| <row> | ||
| <entry><para>VR is shutdown externally.</para></entry> | ||
| <entry><para>&PRODUCT; brings it up into running state.</para></entry> | ||
| </row> | ||
| <row> | ||
| <entry><para>VR is shutdown internally.</para></entry> | ||
| <entry><para>VR continues to stay in stopped state. &PRODUCT;will not automatically change | ||
| the VR state into running.</para></entry> | ||
| </row> | ||
| <row> | ||
| <entry><para>VR is stopped and VM is deployed in that network.</para></entry> | ||
| <entry><para>VR state is automatically changed into running state during the VM deployment | ||
| process.</para></entry> | ||
| </row> | ||
| <row> | ||
| <entry><para>VR is destroyed internally.</para></entry> | ||
| <entry><para>&PRODUCT; will not automatically spin up a new router.</para></entry> | ||
| </row> | ||
| <row> | ||
| <entry><para>Deploy a VM in a network where router is destroyed by | ||
| &PRODUCT;.</para></entry> | ||
| <entry><para>&PRODUCT; spins up a new router.</para></entry> | ||
| </row> | ||
| <row> | ||
| <entry><para>Running VR is destroyed externally.</para></entry> | ||
| <entry><para>&PRODUCT; shows that the VR is stopped. The router will not be brought back | ||
| to running state.</para></entry> | ||
| </row> | ||
| </tbody> | ||
| </tgroup> | ||
| </informaltable> | ||
| <para>This feature is supported on the following hypervisors: XenServer, VMware, and KVM.</para> | ||
| </section> |