| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="vboxwatchdog">
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| 4 | <title><ph conkeyref="vbox-conkeyref-phrases/product-name"/> Watchdog</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>The memory ballooning service, formerly known as <userinput>VBoxBalloonCtrl</userinput>, was renamed to
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| 8 | VBoxWatchdog. This service now incorporates the following host services that are meant to be run in a server
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| 9 | environment: </p>
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| 10 | <ul>
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| 11 | <li>
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| 12 | <p><b outputclass="bold">Memory ballooning control.</b>
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| 13 | This service automatically takes care of a VM's configured
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| 14 | memory balloon. See <xref href="guestadd-balloon.dita">Memory Ballooning</xref>. This
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| 15 | service is useful for server environments where VMs may
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| 16 | dynamically require more or less memory during runtime.
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| 17 | </p>
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| 18 | <p>The service periodically checks a VM's current memory balloon and its free guest RAM and automatically
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| 19 | adjusts the current memory balloon by inflating or deflating it accordingly. This handling only applies to
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| 20 | running VMs having recent Guest Additions installed. </p>
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| 21 | </li>
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| 22 | <li>
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| 23 | <p><b outputclass="bold">Host isolation detection.</b>
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| 24 | This service provides a way to detect whether the host cannot
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| 25 | reach the specific <ph conkeyref="vbox-conkeyref-phrases/product-name"/> server instance anymore and
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| 26 | take appropriate actions, such as shutting down, saving the
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| 27 | current state or even powering down certain VMs.
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| 28 | </p>
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| 29 | </li>
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| 30 | </ul>
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| 31 | <p>All configuration values can be either specified using the command line or global extradata, whereas command line
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| 32 | values always have a higher priority when set. Some of the configuration values also be specified on a per-VM
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| 33 | basis. So the overall lookup order is: command line, per-VM basis extradata if available, global extradata. </p>
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| 34 | </body>
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| 35 | </topic>
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