如何在VirtualBox中同步主机唤醒时间？ [英] How to sync time on host wake-up within VirtualBox?

问题描述

我正在使用VirtualBox在Vagrant中运行基于Ubuntu 12.04的盒子。到目前为止，一切都很好-除了一件事：

I am running an Ubuntu 12.04-based box inside of Vagrant using VirtualBox. So far, everything is fine - except for one thing:

让我们假设虚拟机正在运行。然后，主机进入待机模式。再次唤醒虚拟机后，该虚拟机仍在运行，但是其内部时钟继续运行，在主机关闭时停止在该位置。因此，这基本上意味着：将主机休眠15分钟，再次将其唤醒，然后VM的内部时钟延迟15分钟。

Let's assume that the VM is running. Then, the host goes to standby-mode. After waking it up again, the VM is still running, but its internal clock continues where it stopped when the host went down. So this basically means: Put the host to sleep for 15 minutes, wake it up again, then the VM's internal clock is 15 minutes late.

如何解决此问题（出于明显的原因，不能手动设置时间；-)）？每当主机系统更改其状态时，是否可以在Vagrant VM中运行脚本？

How can I fix this (setting the time manually is not an option for obvious reasons ;-))? Is there a way to run a script inside of a Vagrant VM whenever the host system changes its state?

我已经读过文档，默认情况下，VirtualBox Guest Additions每10秒与主机同步一次时间。显然这没有发生，但是我找不到任何禁用它的地方。有什么想法吗？

I've read in the documentation that by default the VirtualBox Guest Additions sync the time with the host every 10 seconds. Apparently this is not happening, but I can not find any place where it is disabled. So any ideas?

PS：已安装来宾添加项，并与使用的VirtualBox版本匹配。

PS: The Guest Additions are installed and match the version of VirtualBox being used.

推荐答案

文档在此处缺少一些细节。

The documentation lacks some details here.

VirtualBox每10秒钟执行一次操作只是稍作调整（大约为0.005秒）。仅当时间差达到阈值（默认为20分钟）时，才会执行真实重新同步。

What VirtualBox does every 10 seconds is just slight adjustement (something like 0.005 seconds). Only when the time difference reaches a threshold (20 minutes by default) a "real" resync is done.

您可以使用以下命令将阈值降低（即减少至10秒）以下命令：

You can reduce the thresold (i.e. to 10 seconds) with the following command:

VBoxManage guestproperty set <vm-name> "/VirtualBox/GuestAdd/VBoxService/--timesync-set-threshold" 10000

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