blocks|key|492046|text|这是我遇到的一个问题，有时这些漂移太大，以致于ntp服务拒绝同步。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|492047|我发现，如果您在来宾上安装vmware工具，它将自动同步它的时间和主机的时间。|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|F|8|@]|9|@]|A|$]]]|D|$]]

That's a problem I encountered and sometimes the drifts are so large that the ntp service refused to sync.

I found that if you install the vmware tools on the guest, it will automatically sync its time against the host's time.

blocks|key|492346|text|简单回答:适当的内核参数和ntpd配置|type|unstyled|depth|inlineStyleRanges|entityRanges|data|492347|很长的答案:+VMware有一个很好的最佳实践文档，http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427|offset|length|492348|请注意，这与这个线程中的一些信息有些矛盾。例如，特别建议不再使用vmware-tools+timesync特性。|entityMap|0|LINK|mutability|MUTABLE|url|http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006427^0|0|Q|2T|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]]|H|$I|$5|J|K|L|A|$M|N]]]]

Short Answer: proper kernel parameters and ntpd config

Long Answer: VMware has a best practices doc that is pretty good on this, 
<a href="http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&amp;cmd=displayKC&amp;externalId=1006427" rel="nofollow noreferrer">http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&amp;cmd=displayKC&amp;externalId=1006427</a>

Note that it is somewhat contrary to some of the information in this thread. For instance, it is specifically recommended not to use the vmware-tools timesync feature anymore.

blocks|key|4230813|text|是的，安装vmware-时钟同步工具是很重要的，但可能还不够.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4230814|对我起作用的是添加内核引导参数：|4230815|clock=pit+notsc|code-block|syntax|javascript|4230816|这会将时钟源设置为vmware不断更新的东西，并禁用时间同步计数器。|4230817|也许与此无关，但在最近的足够多的内核上，我也总是附加如下：|4230818|divider=10|4230819|这大大降低了客户cpu的利用率。|4230820|无论是否安装vmware工具，这两种方法都很有帮助，有助于使时钟保持更紧密的同步(而不是快速漂移的时钟与vmware工具时钟同步服务之间的不断挣扎)。|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|V|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|W|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|X|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|Z|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|10|8|@]|9|@]|A|$]]]|S|$]]

Yes, installing vmware-tools for the clock sync tool is important, but might not be enough.

What has worked for me is adding the kernel boot parameter:

<pre><code>clock=pit notsc
</code></pre>

This sets the clocksource to something vmware keeps updated, and disables the time sync counter.

Perhaps unrelated, but on recent enough kernels I always also append:

<pre><code>divider=10
</code></pre>

which significantly reduces guest cpu utilization.

Both of these are also helpful with or without vmware tools are installed, and help keep the clocks more closely in sync (rather than a constant struggle between a quickly drifting clock and the vmware tools clock sync service).

blocks|key|4230699|text|是的，您必须在VM客户端上安装vmware工具。然后，您可以在VM的选项屏幕上设置框“同步来宾时间与主机”按钮。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

Yes, you have to install vmware-tools on the VM client. Then you can set the box "synchronize guest time with host" button on the VM's Options screen.

blocks|key|492132|text|已经选择了一个答案(这是最好的答案，因为vmware工具给您带来了许多其他优势)，但是另一个选择是在cron中运行常规的ntpdate命令。这纠正了你的时钟，但不管理时钟漂移，但在紧要关头工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

There's an answer which is already selected (and it is the best answer, since vmware tools gives you so many other advantages), but another option is also to run regular ntpdate commands in the cron. This corrects your clock, however doesn't manage clock drift, but works in a pinch.

blocks|key|492232|text|使用ntpdate或rdate时要小心，因为许多服务器应用程序依赖于连续的时间，因此艰难地移动时间通常不是明智的想法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|492233|例如Dovecot，如果它检测到时间有很大的变化，它就会退出。|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|F|8|@]|9|@]|A|$]]]|D|$]]

Be careful with ntpdate or rdate, it's usually not a wise idea to move the time the hard way, as many server applications depend on a continuous time. 

Dovecot for instance, will just quit if it detects a large shift of time.

blocks|key|492286|text|如果您在客人中使用的是“无痒”内核(默认情况下，2.6.22%2B是IIRC)，那么时钟漂移更容易管理。我发现使用NTP比VMWare自己的工具更精确，但我还没有对此进行科学测试。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|492287|要阻止NTP，只需放弃，如果沉重的负载或其他问题使时钟偏离得太远(这在较新的内核中要少得多，但仍然可能发生)，请确保在ntp.conf顶部/附近有“修补程序恐慌0”行。|492288|需要考虑的是，将主机时钟与公共时钟同步，将VM与主机同步--不要让所有VM单独与公共时间服务器联系。|492289|另外:不要在与NTPD同步的同时使用VMWare自己的时钟客户同步。这两个人会互相绊倒，让你的VM时钟处于一种不确定和不可靠的状态。|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|J|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|K|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|L|8|@]|9|@]|A|$]]]|H|$]]

If you are using a "tickless" kernel (2.6.22+ is by default IIRC) in the guests then clock drift is easier to manage. I have found that using NTP is more accurate than VMWare's own tool but I've not scientifically tested this.

To stop NTP simply giving up if heavy load or some other issue makes the clock drift too far (this much more rare with the newer kernels but can still happen) make sure you have the line "tinker panic 0" line at/near the top of your ntp.conf.

To be considerate, sync your host machines clock with public clocks and the VMs with the host - don't have all your VMs separately contacting public time servers.

Also: do not use VMWare's own clock guest sync at the same time as NTPD. The two will trip over each other leaving your VM's clock in an undefined and unreliable state.

blocks|key|492388|text|下面是对我过去帮助过的vmware计时文章的一个很好的汇编：http://blogs.vmware.com/kb/2009/02/new-timekeeping-articles.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|entityMap|0|LINK|mutability|MUTABLE|url|http://blogs.vmware.com/kb/2009/02/new-timekeeping-articles.html^0|U|1S|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@$A|L|B|M|1|N]]|C|$]]]|D|$E|$5|F|G|H|C|$I|J]]]]

Here's a good compilation of vmware timekeeping articles that have helped me in the past: 
<a href="http://blogs.vmware.com/kb/2009/02/new-timekeeping-articles.html" rel="nofollow noreferrer">http://blogs.vmware.com/kb/2009/02/new-timekeeping-articles.html</a>

blocks|key|4230626|text|如果您将NTP守护进程作为客户端安装在您的Linux客户端上，它将定期检查并确保您的时钟不会长期漂移。你不必做任何花哨的主客同步，因为服务器只是..。在网上。:)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ece.udel.edu/~mills/ntp/html/ntpd.html^0|4|7|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@$A|L|B|M|1|N]]|C|$]]]|D|$E|$5|F|G|H|C|$I|J]]]]

If you install the <a href="http://www.ece.udel.edu/~mills/ntp/html/ntpd.html" rel="nofollow noreferrer">NTP daemon</a> on your Linux guest as a client, it will periodically check and make sure your clocks do not drift in the long run. You needn't do any fancy host-guest syncing, because the server is just .. on the net. :)

blocks|key|4230755|text|这可能是有用的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4230756|来宾内核引导参数：|4230757|+clock=pit|code-block|syntax|javascript|entityMap|0|LINK|mutability|MUTABLE|url|http://www.novell.com/support/viewContent.do?externalId=3858673&sliceId=1^0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|W|8|@]|9|@]|C|$I|J]]]|K|$L|$5|M|N|O|C|$P|Q]]]]

<a href="http://www.novell.com/support/viewContent.do?externalId=3858673&amp;sliceId=1" rel="nofollow noreferrer">This</a> could be useful..

Guest kernel boot parameter:

<pre><code> clock=pit
</code></pre>

How does one ensure that linux hosts, running on vmware infrastruction 3 or vmware 3 esxi remain in sync with the ntp server. I have found that a linux guest running under esx or esxi has a tendency to have the clock drift in the future.

How does one ensure that the time remains in sync with the time server? Do i have to deploy vmware tools on the linux host? and then sync the host to the ntp server, the guest with the host and with the ntp server?

Vmware host time drift

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何确保运行在vmware基础设施3或vmware 3 esxi上的linux主机与ntp服务器保持同步。我发现在esx或esxi下运行的linux客户将来有可能会出现时钟漂移。如何确保时间与时间服务器保持同步？我必须在linux主机上部署vmware工具吗？然后将主机同步到ntp服务器，将来宾同步到主机和ntp服务器？

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