[CentOS] NTP and virtual guests
Stephen Harris
lists at spuddy.orgMon May 28 12:52:52 UTC 2012
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On Mon, May 28, 2012 at 08:41:30AM -0400, James B. Byrne wrote: > We encountered a problem with respect to KVM virtual host restore and > NTP. Specifically, our VM test host was shutdown by an extended power > outage and 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. Umm, ntp won't shut down your guests unless you've done something non-standard. NTP inside the guest will abort because of the time difference but the guest will keep running... just with the wrong time. See the "-g" option: -g Normally, ntpd exits with a message to the system log if the offset exceeds the panic threshold, which is 1000 s by default. This option allows the time to be set to any value without restriction; however, this can happen only once. If the thresh- old is exceeded after that, ntpd will exit with a message to the system log. This option can be used with the -q and -x options. See the tinker command for other options. -- rgds Stephen
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