On Mon, May 28, 2012 10:10, Bob Hoffman wrote: > On 5/28/2012 9:59 AM, James B. Byrne wrote: >> On Mon, May 28, 2012 08:50, Reindl Harald wrote: >>> >>> Am 28.05.2012 14:41, schrieb James B. Byrne: >>>> when power returned all of the restored guests were immediately >>>> shutdown by ntp because the time differential between the >>>> restored systems and that of the ntpd sync servers exceeded >>>> the panic threshold. >>> how can ntpd shutdown a guest? >> I have no idea. Perhaps I misunderstood what the ntpd man page >> referred to as a panic. >> >> If it is not ntpd then I still need to discover some way of ensuring >> that all the KVM guests that were active at the time of a power >> failure automatically come back on line when the KVM host system >> starts up. I cannot find any reference to how this is done. >> >> Are there any recommended solutions? These systems are on UPS >> already >> but the power failure duration exceeded the endurance of the the >> UPS. >> > I know when ntp changes the time drastically (like ntpdate) my vsftpd > just commits suicide and dies.. > I imagine something like that is going on with the lvm software either > on the host or the kvm? > > I would suggest turning off ntp before long time shut downs...and > (ugh) manually going through the host and all vms upon turn on and > ntpdate them, then turn ntp on, then reboot to make it all come > back on? > > perhaps a script that turns off ntp, runs ntpdate on host, then on > each kvm upon reboot? this sounds rather scary. > > I cannot find anything in the logs that explain what is happening to me. The evidence I have indicates that when the host kvm system is powered off and restarted then the guests do not restart. This behaviour is at variance with a controlled shutdown wherein active guests are (usually) restarted when the host reboots. I infer from this observation that system scripts already handle this more or less correctly. I suppose that I could just create an init script that read a custom status file and restated every domain that it found therein using virsh. However, if such a beast already exists then I would rather not have to reinvent the wheel. Is anyone aware of such a script or where one might be found? I am not havig much luck with Google this morning. -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB at Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3