How to sync time on host wake-up within VirtualBox?

怎甘沉沦 提交于 2019-11-29 20:24:24

The documentation lacks some details here.

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.

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

Summarizing answers of @zilupe and @Slobodan Kovacevic, solution is to add following to Vagrantfile:

config.vm.provider 'virtualbox' do |vb|
   vb.customize [ "guestproperty", "set", :id, "/VirtualBox/GuestAdd/VBoxService/--timesync-set-threshold", 1000 ]
end

This will synchronize clocks each time when desync becomes > 1s (1000ms)

fred727

I give an other solution to sync time between guest & host without installing Virtualbox guest addition:

  1. install ntp on your guest, and de-comment these lines in /etc/ntp.conf:

    disable auth
    broadcastclient
    

Then, restart ntp with service ntp restart

  1. Active broadcast on your host:

    • For Linux users, edit your /etc/ntp.conf file and configure broadcast (you must adapt IP):

      broadcast 192.168.123.255

    • For Windows users, activate the "Windows Time" service. You can then read this page to configure it to broadcast time

    Then, restart time service on host.

For me to get timesync working I had to do this:

vboxmanage setextradata «machine-name» "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" 0

It turns the timesync on. It was, for some reason, off.

I found a solution:

  1. install ntpdate
  2. add "s" permission for ntpdate, this allows non-root users to run ntpdate as root: sudo chmod u+s /usr/sbin/ntpdate
  3. add one line in ~/.bashrc: ntpdate -u ntp.ubuntu.com

After that, each time you login to the linux system, the time will be sync once.

you can install the VirtualBox Guest Additions in the VM to sync the time automatically by VB.

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