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From "Musayev, Ilya" <imusa...@webmd.net>
Subject RE: [DISCUSS] How to best do time sync. (WAS: [VOTE] Release Apache CloudStack 4.1.0 (fifth round))
Date Thu, 30 May 2013 16:58:25 GMT
Thanks Chip.

I've posted this response under CLOUDSTACK-2492.. curious what others may think about a long
term solution to this problem..

--------------
I think we should make the whole NTP schema more modular and robust. 

For example, in my experience working for several companies, not even once have we used vmware
tools time sync - due to known bugs and issues. Instead we would prefer to use local NTP server
or external pool.ntp.org 

There are two way we can address this: 

Quick solution (quick means not ideal): 
Capture the NTP servers defined on MS and feed it as arguments to system vms 
On initial start of the system vm, check if you can access ntp servers defined on MS vm, if
not, check if you can access pool.ntp.org servers - if none defined - use hypervisor tools
sync 

Long term solution: 
When adding zones, define NTP servers in UI to be used with system VMs or bypass NTP servers
and allow vm-tools time sync with hypervisor. 

Thoughts? 

Thanks 
ilya

> -----Original Message-----
> From: Chip Childers [mailto:chip.childers@sungard.com]
> Sent: Wednesday, May 29, 2013 2:30 PM
> To: dev@cloudstack.apache.org
> Subject: [DISCUSS] How to best do time sync. (WAS: [VOTE] Release Apache
> CloudStack 4.1.0 (fifth round))
> 
> Ilya,
> 
> I'm breaking off a new thread for this discussion.  If you want to discuss the
> design options presented in the jira, this would be a good thread for that. ;-)
> 
> -chip
> 
> On Wed, May 29, 2013 at 06:24:27PM +0000, Musayev, Ilya wrote:
> > John,
> >
> > I clearly see your concern, please review my response under CLOUDSTACK-
> 2492.
> >
> > Thanks
> > ilya
> >
> > > -----Original Message-----
> > > From: John Burwell [mailto:jburwell@basho.com]
> > > Sent: Wednesday, May 29, 2013 10:10 AM
> > > To: dev@cloudstack.apache.org
> > > Subject: Re: [VOTE] Release Apache CloudStack 4.1.0 (fifth round)
> > >
> > > -0.  I don't believe we should be shipping a release with known
> > > clock sync issues (see CLOUDSTACK-
> > > 2492<https://issues.apache.org/jira/browse/CLOUDSTACK-2492>).
> > >  Since the community voted to go forward, I will not cast a -1.
> > > However, I feel it is important to highlight operational issues
> > > that, in my view, a system such as CloudStack should never knowingly
> ship.
> > >
> > > -John



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