| 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="heartbeatservice">
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| 4 | <title>Configuring the Heartbeat Service</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | Oracle VM VirtualBox ships a simple heartbeat service. Once the Guest
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| 9 | Additions are active, the guest sends frequent heartbeat pings to
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| 10 | the host. If the guest stops sending the heartbeat pings without
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| 11 | properly terminating the service, the VM process will log this
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| 12 | event in the VBox.log file. In the future it might be possible to
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| 13 | configure dedicated actions but for now there is only a warning in
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| 14 | the log file.
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| 15 | </p>
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| 16 | <p>
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| 17 | There are two parameters to configure. The <i>heartbeat
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| 18 | interval</i> defines the time between two heartbeat pings.
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| 19 | The default value is 2 seconds, that is, the heartbeat service of
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| 20 | the Oracle VM VirtualBox Guest Additions will send a heartbeat ping
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| 21 | every two seconds. The value in nanoseconds can be configured like
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| 22 | this:
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| 23 | </p>
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| 24 | <pre xml:space="preserve">VBoxManage setextradata <varname>VM-name</varname> \
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| 25 | VBoxInternal/Devices/VMMDev/0/Config/HeartbeatInterval 2000000000</pre>
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| 26 | <p>
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| 27 | The <i>heartbeat timeout</i> defines the time the
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| 28 | host waits starting from the last heartbeat ping before it defines
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| 29 | the guest as unresponsive. The default value is 2 times the
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| 30 | heartbeat interval (4 seconds) and can be configured as following,
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| 31 | in nanoseconds:
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| 32 | </p>
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| 33 | <pre xml:space="preserve">VBoxManage setextradata <varname>VM-name</varname> \
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| 34 | VBoxInternal/Devices/VMMDev/0/Config/HeartbeatTimeout 4000000000</pre>
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| 35 | <p>
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| 36 | If the heartbeat timeout expires, there will be a log message like
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| 37 | <i>VMMDev: HeartBeatCheckTimer: Guest seems to be
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| 38 | unresponsive. Last heartbeat received 5 seconds ago.</i> If
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| 39 | another heartbeat ping arrives after this warning, there will be a
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| 40 | log message like <i>VMMDev: GuestHeartBeat: Guest is
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| 41 | alive.</i>
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| 42 | </p>
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| 43 | </body>
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| 44 |
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| 45 | </topic>
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