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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="heartbeatservice">
<title>Configuring the Heartbeat Service</title>
<body>
<p>
Oracle VM VirtualBox ships a simple heartbeat service. Once the Guest
Additions are active, the guest sends frequent heartbeat pings to
the host. If the guest stops sending the heartbeat pings without
properly terminating the service, the VM process will log this
event in the VBox.log file. In the future it might be possible to
configure dedicated actions but for now there is only a warning in
the log file.
</p>
<p>
There are two parameters to configure. The <i>heartbeat
interval</i> defines the time between two heartbeat pings.
The default value is 2 seconds, that is, the heartbeat service of
the Oracle VM VirtualBox Guest Additions will send a heartbeat ping
every two seconds. The value in nanoseconds can be configured like
this:
</p>
<pre xml:space="preserve">VBoxManage setextradata <varname>VM-name</varname> \
VBoxInternal/Devices/VMMDev/0/Config/HeartbeatInterval 2000000000</pre>
<p>
The <i>heartbeat timeout</i> defines the time the
host waits starting from the last heartbeat ping before it defines
the guest as unresponsive. The default value is 2 times the
heartbeat interval (4 seconds) and can be configured as following,
in nanoseconds:
</p>
<pre xml:space="preserve">VBoxManage setextradata <varname>VM-name</varname> \
VBoxInternal/Devices/VMMDev/0/Config/HeartbeatTimeout 4000000000</pre>
<p>
If the heartbeat timeout expires, there will be a log message like
<i>VMMDev: HeartBeatCheckTimer: Guest seems to be
unresponsive. Last heartbeat received 5 seconds ago.</i> If
another heartbeat ping arrives after this warning, there will be a
log message like <i>VMMDev: GuestHeartBeat: Guest is
alive.</i>
</p>
</body>
</topic>
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