blocks|key|360758|text|如果您的主机时间正确，您可以设置以下.vmx配置文件选项以启用定期同步：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|360759|tools.syncTime+=+true|code-block|syntax|javascript|360760|默认情况下，这每分钟同步一次时间。要更改周期速率，请将以下选项设置为所需的同步时间(以秒为单位)：|360761|tools.syncTime.period+=+60|360762|为此，您需要在来宾操作系统中安装VMWare工具。|360763|有关更多信息，请参阅http://www.vmware.com/pdf/vmware_timekeeping.pdf|offset|length|360764|entityMap|0|LINK|mutability|MUTABLE|url|http://www.vmware.com/pdf/vmware_timekeeping.pdf^0|0|0|0|0|0|A|1C|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

If your host time is correct, you can set the following .vmx configuration file option to enable periodic synchronization:

<pre><code>tools.syncTime = true
</code></pre>

By default, this synchronizes the time every minute. To change the periodic rate, set the following option to the desired synch time in seconds:

<pre><code>tools.syncTime.period = 60
</code></pre>

For this to work you need to have VMWare tools installed in your guest OS.

See <a href="http://www.vmware.com/pdf/vmware_timekeeping.pdf" rel="noreferrer">http://www.vmware.com/pdf/vmware_timekeeping.pdf</a> for more information

blocks|key|3356837|text|根据VMware的知识库，实际的解决方案取决于Linux发行版和发行版，在RHEL5.3中，我通常编辑/etc/grub.conf并将以下参数附加到内核条目:+divider=10+clocksource=acpi_pm|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3356838|然后启用NTP，从vmware-toolbox禁用VMware时间同步，最后重新启动虚拟机|3356839|在这里可以找到一个完整的表格，其中包含每个Linux发行版的指导方针：|3356840|LINUX客户机http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427的计时最佳实践|offset|length|3356841|entityMap|0|LINK|mutability|MUTABLE|url|http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427^0|0|0|0|8|2T|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

according to VMware's knowledge base, the actual solution depends on the Linux distro and release, in RHEL 5.3 I usually edit /etc/grub.conf and append this parameters to the kernel entry: divider=10 clocksource=acpi_pm

Then enable NTP, disable VMware time synchronization from vmware-toolbox and finally reboot the VM

A complete table with guidelines for each Linux distro can be found here:

TIMEKEEPING BEST PRACTICES FOR LINUX GUESTS
<a href="http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&amp;cmd=displayKC&amp;externalId=1006427" rel="noreferrer">http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&amp;cmd=displayKC&amp;externalId=1006427</a>

blocks|key|3356760|text|我会替Windows来宾回答的。如果您安装了VMware+Tools，则任务栏的通知区域(时钟附近)会有一个VMware+Tools图标。双击它并设置选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3356761|如果你没有安装VMware工具，你仍然可以设置互联网时间的时钟选项来与一些NTP服务器同步。如果您的物理机为来宾计算机提供NTP协议，那么您可以通过仅主机网络来完成此任务。否则，您将不得不让您的来宾与互联网上真正的NTP服务器进行同步，例如time.windows.com。|3356762|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I'll answer for Windows guests. If you have VMware Tools installed, then the taskbar's notification area (near the clock) has an icon for VMware Tools. Double-click that and set your options.

If you don't have VMware Tools installed, you can still set the clock's option for internet time to sync with some NTP server. If your physical machine serves the NTP protocol to your guest machines then you can get that done with host-only networking. Otherwise you'll have to let your guests sync with a genuine NTP server out on the internet, for example time.windows.com.

blocks|key|3144004|text|这里需要注意的是。我们在ESXi主机上运行Windows时也遇到了同样的问题。在来宾服务器上的VMWare+Tools中打开了时间同步，但来宾时钟与主机时钟一致(相差约30秒)。ESXi主机配置为从内部时间服务器获取时间更新。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3144005|原来，我们在Windows虚拟机的(控制面板>日期和时间>互联网时间选项卡)中打开了互联网时间设置，所以来宾可以从两个地方获得时间更新，互联网时间是赢家。我们关闭了它，现在来宾时钟很好，只从ESXi主机获取时间。|3144006|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Something to note here. We had the same issue with Windows VM's running on an ESXi host. The time sync was turned on in VMWare Tools on the guest, but the guest clocks were consistently off (by about 30 seconds) from the host clock. The ESXi host was configured to get time updates from an internal time server.

It turns out we had the Internet Time setting turned on in the Windows VM's (Control Panel > Date and Time > Internet Time tab) so the guest was getting time updates from two places and the internet time was winning. We turned that off and now the guest clocks are good, getting their time exclusively from the ESXi host.

blocks|key|3144042|text|在我的例子中，我们在Windows+Server2003+R2标准版上运行VMWare+Server2.02。主机也是Windows+Server2003+R2标准。我安装了VMware工具，并将其设置为同步时间。我做了我在各种网站上找到的所有我能想到的东西。我们仍然有可怕的漂移，尽管它已经从15分钟或更长时间缩短到3或4分钟范围。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3144043|最后，我在vmware.log中找到了这个条目(作为.vmx文件驻留在文件夹中)：“您的主机系统不保证跨不同CPU的TSC同步，因此请在您的Windows+Boot.ini文件中设置/usepmtimer选项，以确保计时是可靠的。有关详细信息，请参阅Microsoft+KB+http://support.microsoft.com/kb...和Microsoft+KB+http://support.microsoft.com/kb...以获取更多信息。”|offset|length|3144044|原因:当计算机在BIOS或某些英特尔多核处理器中启用了AMD+Cool‘n’Cause技术(AMD双核)时，会出现此问题。当不同内核之间的时间不同步时，多核或多处理器系统可能会遇到时间戳计数器(TSC)漂移。使用TSC作为计时资源的操作系统可能会遇到此问题。如果系统中有其他可用作计时源的计时器，则较新的操作系统通常默认不使用TSC。其他可用的定时器包括PM_Timer和高精度事件定时器(HPET)。解决方法:要解决此问题，请与硬件供应商联系，查看是否有新的驱动程序/固件更新可用于解决此问题。|3144045|注意:驱动程序安装可能会在Boot.ini文件中添加/usepmtimer开关。|3144046|一旦这个(/usepmtimer开关)完成，时钟就会准时停止。|3144047|entityMap|0|LINK|mutability|MUTABLE|url|http://support.microsoft.com/kb|1^0|0|3U|V|0|56|V|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]|$D|Z|E|10|1|11]]|A|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|14|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|S]]]]

In my case we are running VMWare Server 2.02 on Windows Server 2003 R2 Standard. The Host is also Windows Server 2003 R2 Standard. I had the VMware Tools installed and set to sync the time. I did everything imaginable that I found on various internet sites. We still had horrendous drift, although it had shrunk from 15 minutes or more down to the 3 or 4 minute range.

Finally in the vmware.log I found this entry (resides in the folder as the .vmx file):
"Your host system does not guarantee synchronized TSCs across different CPUs, so please set the /usepmtimer option in your Windows Boot.ini file to ensure that timekeeping is reliable. See Microsoft KB <a href="http://support.microsoft.com/kb" rel="nofollow">http://support.microsoft.com/kb</a>... for details and Microsoft KB <a href="http://support.microsoft.com/kb" rel="nofollow">http://support.microsoft.com/kb</a>... for additional information."

Cause: This problem occurs when the computer has the AMD Cool'n'Quiet technology (AMD dual cores) enabled in the BIOS or some Intel multi core processors. Multi core or multiprocessor systems may encounter Time Stamp Counter (TSC) drift when the time between different cores is not synchronized. The operating systems which use TSC as a timekeeping resource may experience the issue. Newer operating systems typically do not use the TSC by default if other timers are available in the system which can be used as a timekeeping source. Other available timers include the PM_Timer and the High Precision Event Timer (HPET).
Resolution: To resolve this problem check with the hardware vendor to see if a new driver/firmware update is available to fix the issue.

Note The driver installation may add the /usepmtimer switch in the Boot.ini file.

Once this (/usepmtimer switch) was done the clock was dead on time.

blocks|key|3356934|text|This+documentation为我解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3356935|entityMap|0|LINK|mutability|MUTABLE|url|http://pubs.vmware.com/vsphere-50/index.jsp?topic=%252Fcom.vmware.vmtools.install.doc%252FGUID-C0D8326A-B6E7-4E61-8470-6C173FDDF656.html^0|0|I|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.vmtools.install.doc%2FGUID-C0D8326A-B6E7-4E61-8470-6C173FDDF656.html" rel="nofollow">This documentation</a> solved this problem for me.

blocks|key|360700|text|CPU速度因省电而不同。我最初注意到这一点是因为VMware在我的笔记本电脑上给了我一个有用的提示，但这个页面提到了同样的事情：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|360701|引用自：VMWare+tips+and+tricks省电(SpeedStep、C状态、P状态...)|offset|length|360702|您的节能设置可能会严重影响vmware的性能。有几个级别的省电。|360703|CPU频率|360704|这应该不会导致性能下降，除非以较低的频率运行CPU时性能明显降低(手动或通过诸如"ondemand“或”conservative“之类的调控器)。在vmware运行时更改CPU速度的唯一问题是，Windows时钟会增加时间损失。要防止出现这种情况，请在/etc/vmware/+kHz中指定完整的CPU速度。|360705|host.cpukHz+=+2167000|360706|entityMap|0|LINK|mutability|MUTABLE|url|http://maple.rsvs.ulaval.ca/mediawiki/index.php/VMWare_tips_and_tricks^0|0|4|M|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|13|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

The CPU speed varies due to power saving. I originally noticed this because VMware gave me a helpful tip on my laptop, but this page mentions the same thing:

Quote from : <a href="http://maple.rsvs.ulaval.ca/mediawiki/index.php/VMWare_tips_and_tricks" rel="nofollow noreferrer">VMWare tips and tricks</a>
Power saving (SpeedStep, C-states, P-States,...)

Your power saving settings may interfere significantly with vmware's performance. There are several levels of power saving.

CPU frequency

This should not lead to performance degradation, outside of having the obvious lower performance when running the CPU at a lower frequency (either manually of via governors like "ondemand" or "conservative"). The only problem with varying the CPU speed while vmware is running is that the Windows clock will gain of lose time. To prevent this, specify your full CPU speed in kHz in /etc/vmware/config

host.cpukHz = 2167000

blocks|key|358051|text|VMware经历了大量的时钟漂移。这个“vmware时钟漂移”的Google+search链接到了几篇文章。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|358052|第一个点击可能对你最有用：http://www.fjc.net/linux/linux-and-vmware-related-issues/linux-2-6-kernels-and-vmware-clock-drift-issues|358053|entityMap|0|LINK|mutability|MUTABLE|url|http://www.google.com/search?q=vmware%2Bclock%2Bdrift|1|http://www.fjc.net/linux/linux-and-vmware-related-issues/linux-2-6-kernels-and-vmware-clock-drift-issues^0|W|D|0|0|D|2W|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

VMware experiences a lot of clock drift. This <a href="http://www.google.com/search?q=vmware+clock+drift" rel="nofollow noreferrer">Google search</a> for 'vmware clock drift' links to several articles.

The first hit may be the most useful for you: <a href="http://www.fjc.net/linux/linux-and-vmware-related-issues/linux-2-6-kernels-and-vmware-clock-drift-issues" rel="nofollow noreferrer">http://www.fjc.net/linux/linux-and-vmware-related-issues/linux-2-6-kernels-and-vmware-clock-drift-issues</a>

blocks|key|3356889|text|在Windows+Guest上安装VMware工具时，默认情况下不会启用“时间同步”。然而，“最佳实践”是在Windows来宾上启用时间同步。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3356890|有几种方法可以从虚拟机外部实现这一点，但我想找到一种方法，在安装工具时或之后从来宾系统内部启用时间同步。|3356891|令人惊讶的是，这并不像我预期的那样简单。(我假设可以在工具安装过程中将其设置为参数/配置选项)|3356892|经过一番搜索，我在一篇名为“Using+the+VMware+Tools+Command-Line+Interface”的VMware文章中找到了这样做的方法。|3356893|因此，如果关闭了时间同步，您可以通过在来宾系统中运行以下命令行来启用时间同步：|3356894|++++++VMwareService.exe+–cmd+“vmx.set_option+synctime+0+1″|code-block|syntax|javascript|3356895|补充说明|3356896|出于某种原因(我很愚蠢)，该实用程序要求您指定当前值和新值|3356897|0=禁用1=启用|3356898|所以--如果你在一台已经设置了这个命令的机器上运行这个命令，你会得到一个错误-“Invalid+old+value”。显然，你可以在运行时“忽略”这个错误(所以不是什么大问题)，但当前的设计似乎有点愚蠢。如果你可以简单地指定你想要设置的值，而不需要指定当前的值，这将是更明智的。|3356899|例如VMwareService.exe+-cmd“vmx.set_option+synctime+<0%7C1>”|3356900|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

When installing VMware Tools on a Windows Guest, “Time Synchronisation” is not enabled by default.
However – “best practise” is to enable time synch on Windows Guests.

There a several ways to do this from outside the VM, but I wanted to find a way to enable time sync from within the guest itself either on or after tools install.

Surprisingly, this wasn’t quite as straightforward as I expected.
(I assumed it would be posible to set this as a parameter / config option during tools install)

After a bit of searching I found a way to do this in a VMware article called “Using the VMware Tools Command-Line Interface“.

So, if time sync is disabled, you can enable it by running the following command line in the guest:

<pre><code> VMwareService.exe –cmd “vmx.set_option synctime 0 1″
</code></pre>

Additional Notes

For some (IMHO stupid) reason, this utility requires you to specify the current as well as the new value

0 = disabled
1 = enabled

So – if you run this command on a machine which has this already set, you will get an error saying – “Invalid old value“.
Obviously you can “ignore” this error when run (so not a huge deal) but the current design seems a bit dumb.
IMHO it would be much more sensible if you could simply specify the value you want to set and not require the current value to be specified.

i.e.
 VMwareService.exe –cmd “vmx.set_option synctime &lt;0|1>”

blocks|key|356068|text|在Active+Directory环境中，重要的是要知道：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|356069|356070|所有成员计算机与任何域控制器同步。|unordered-list-item|356071|在域中，所有域控制器从该域的PDC仿真程序(PDCe)同步。|356072|域的PDC仿真程序应与本地或NTP同步。|356073|356074|在vmware中设置时间或配置时间同步时，请务必考虑这一点。|356075|摘自：http://www.sysadmit.com/2016/12/vmware-esxi-configurar-hora.html|offset|length|356076|entityMap|0|LINK|mutability|MUTABLE|url|http://www.sysadmit.com/2016/12/vmware-esxi-configurar-hora.html^0|0|0|0|0|0|0|0|3|1S|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|10|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|12|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|15|8|@]|9|@$O|16|P|17|1|18]]|A|$]]|$1|Q|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

In Active Directory environment, it's important to know:

<ul>
<li>All member machines synchronizes with any domain controller.</li>
<li>In a domain, all domain controllers synchronize from the PDC Emulator (PDCe) of that domain.</li>
<li>The PDC Emulator of a domain should synchronize with local or NTP.</li>
</ul>

It's important to consider this when setting the time in vmware or configuring the time sync.

Extracted from: <a href="http://www.sysadmit.com/2016/12/vmware-esxi-configurar-hora.html" rel="nofollow noreferrer">http://www.sysadmit.com/2016/12/vmware-esxi-configurar-hora.html</a>

blocks|key|357397|text|我将以下作业添加到crontab。虽然有点老生常谈，但我觉得应该行得通。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|357398|*/5+***服务ntpd停止&&+ntpdate+pool.ntp.org+&&服务ntpd启动|357399|它从服务中停止ntpd服务更新，然后再次启动ntpd|357400|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I added the following job to crontab. It is hacky but i think should work. 

*/5 * * * * service ntpd stop &amp;&amp; ntpdate pool.ntp.org &amp;&amp; service ntpd start

It stops ntpd service updates from service and starts ntpd again

I have noticed that our VMWare VMs often have the incorrect time on them. No matter how many times I reset the time they keep on desyncing.

Has anyone else noticed this? What do other people do to keep their VM time in sync?

Edit: These are CLI linux VMs btw..

How to keep a VMWare VM's clock in sync?

Windows Server

服务器

虚拟机

Windows

Linux

我注意到，我们的VMWare虚拟机上的时间经常不正确。不管我重置了多少次，它们仍然保持同步。还有没有人注意到这一点？其他人如何使他们的虚拟机时间保持同步？编辑：这些是CLI btw..

问如何保持VMWare虚拟机的时钟同步？
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