Time synchronization inside virtual machines is a. Hypervisor-dependent. See the docs for VirtualBox, VMware, Xen and kvm and read the fine print. I don't even know if there *is* documentation for EC2. b. Poorly documented and difficult to test. If you don't *need* anything better than NTP / one second synchronization, don't waste your time. c. A mine field if you *do* need something better. Stay safe out there. ;-) On Wed, Nov 14, 2012 at 7:22 AM, <John.Florian@xxxxxxxx> wrote: >> From: Stephen John Smoogen <smooge@xxxxxxxxx> >> > On Tue, Nov 13, 2012 at 08:00:23PM -0500, Ben Cotton wrote: >> > On EC2 (as in many virt environments) the hardware clock source is >> > actually >> > synced and running an ntpd service on the client is redundant. >> > >> >> <bikeshed=blue> >> They say it is .... but it is not always. I have had multiple cases >> in KVM and some in Xen where supposedly the clock is kept up but what >> you end up is actually watching time go backwards if you hit heavy >> load in IO or CPU or Mem. Of course if you run into hardware like >> that.. you can install it after your DB has gone poopsies. >> </bikeshed> > > I've seen that happen as well. I found this by hitting the pause button on > the guest IIRC. I just always use NTP to avoid the worry, but I agree NTP > (whether ntpd or chronyd) belongs in @standard not @core. > > -- > John Florian > > -- > devel mailing list > devel@xxxxxxxxxxxxxxxxxxxxxxx > https://admin.fedoraproject.org/mailman/listinfo/devel -- Twitter: http://twitter.com/znmeb; Computational Journalism Publishers Workbench: http://znmeb.github.com/Computational-Journalism-Publishers-Workbench/ How the Hell can the lion sleep with all those people singing "A weem oh way!" at the top of their lungs? -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
