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KVM guest clock sync with host
Clock synchronisation on kvm guestsBest practice for system clock sync on KVM hostVirtual PC: Issues with clock when guest Linux has a different timezone to the host OSBest way to say “sync all system clocks to this server, when and ONLY when I say so?” Mixed setup of Windows+Linux serversHow to keep time on resumed KVM guest with libvirt?Force ntpd to make changes in smaller stepsKVM guest time shift on host rebootHow far is “too far off” for ntpd? Can it get there by a sudden jump to heavy load? Can this be overridden?libvirt / kvm guests take very long time to start after host rebootNtpd on local network - Preventing clock drift causing high offsets
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I'm running KVM w/ centos 6.x.
My guest vm clocks are booting with a 1-2 second lag from their host. My clocksource for the host is ntp. My clocksource for the guest is "kvm-clock", but I need to run ntpd on the guest as well.
It takes roughly 3 minutes for ntpd to correct the time after boot. I'll see this in /var/log/messages
ntpd[1512]: time reset +1.217409 s
But, by this time, our application has already started and it doesn't handle the 1-2 sec time jump very well.
Is this clock difference between the host/guest normal? Is there a way to force the ntpd to set the time earlier in the boot process?
centos kvm-virtualization synchronization ntpd time
edited Apr 23 '13 at 4:13
slm
5,136124460
asked Apr 23 '13 at 3:48
timeouttimeout
11
add a comment |
I'm running KVM w/ centos 6.x.
My guest vm clocks are booting with a 1-2 second lag from their host. My clocksource for the host is ntp. My clocksource for the guest is "kvm-clock", but I need to run ntpd on the guest as well.
It takes roughly 3 minutes for ntpd to correct the time after boot. I'll see this in /var/log/messages
ntpd[1512]: time reset +1.217409 s
But, by this time, our application has already started and it doesn't handle the 1-2 sec time jump very well.
Is this clock difference between the host/guest normal? Is there a way to force the ntpd to set the time earlier in the boot process?
centos kvm-virtualization synchronization ntpd time
edited Apr 23 '13 at 4:13
slm
5,136124460
asked Apr 23 '13 at 3:48
timeouttimeout
11
add a comment |
I'm running KVM w/ centos 6.x.
My guest vm clocks are booting with a 1-2 second lag from their host. My clocksource for the host is ntp. My clocksource for the guest is "kvm-clock", but I need to run ntpd on the guest as well.
It takes roughly 3 minutes for ntpd to correct the time after boot. I'll see this in /var/log/messages
ntpd[1512]: time reset +1.217409 s
But, by this time, our application has already started and it doesn't handle the 1-2 sec time jump very well.
Is this clock difference between the host/guest normal? Is there a way to force the ntpd to set the time earlier in the boot process?
centos kvm-virtualization synchronization ntpd time
edited Apr 23 '13 at 4:13
slm
5,136124460
asked Apr 23 '13 at 3:48
timeouttimeout
11
I'm running KVM w/ centos 6.x.
My guest vm clocks are booting with a 1-2 second lag from their host. My clocksource for the host is ntp. My clocksource for the guest is "kvm-clock", but I need to run ntpd on the guest as well.
It takes roughly 3 minutes for ntpd to correct the time after boot. I'll see this in /var/log/messages
ntpd[1512]: time reset +1.217409 s
But, by this time, our application has already started and it doesn't handle the 1-2 sec time jump very well.
Is this clock difference between the host/guest normal? Is there a way to force the ntpd to set the time earlier in the boot process?
centos kvm-virtualization synchronization ntpd time
centos kvm-virtualization synchronization ntpd time
edited Apr 23 '13 at 4:13
slm
5,136124460
asked Apr 23 '13 at 3:48
timeouttimeout
11
edited Apr 23 '13 at 4:13
slm
5,136124460
asked Apr 23 '13 at 3:48
timeouttimeout
11
edited Apr 23 '13 at 4:13
slm
5,136124460
edited Apr 23 '13 at 4:13
slm
5,136124460
edited Apr 23 '13 at 4:13
slm
5,136124460
5,136124460
asked Apr 23 '13 at 3:48
timeouttimeout
11
asked Apr 23 '13 at 3:48
timeouttimeout
11
asked Apr 23 '13 at 3:48
timeouttimeout
11
11
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
If your application requires the clock to be synced, add ntp-wait to its init script before it is started. Usage is simple, but here is the man page.
EDIT: If you want to sync time as quickly as possible when booting the VM, before starting ntpd as a daemon, run sntp as explained in the documentation for Deprecating ntpdate.
answered Apr 23 '13 at 4:45
sciurussciurus
11k22043
that would work, however it takes ~3 minutes for ntpd to synchronize... which is a really long time.
– timeout
Apr 23 '13 at 16:07
This comment about sync time might be helpful for you. lists.ntp.org/pipermail/questions/2006-November/012096.html
– sciurus
Apr 24 '13 at 1:10
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
If your application requires the clock to be synced, add ntp-wait to its init script before it is started. Usage is simple, but here is the man page.
EDIT: If you want to sync time as quickly as possible when booting the VM, before starting ntpd as a daemon, run sntp as explained in the documentation for Deprecating ntpdate.
answered Apr 23 '13 at 4:45
sciurussciurus
11k22043
that would work, however it takes ~3 minutes for ntpd to synchronize... which is a really long time.
– timeout
Apr 23 '13 at 16:07
This comment about sync time might be helpful for you. lists.ntp.org/pipermail/questions/2006-November/012096.html
– sciurus
Apr 24 '13 at 1:10
add a comment |
If your application requires the clock to be synced, add ntp-wait to its init script before it is started. Usage is simple, but here is the man page.
EDIT: If you want to sync time as quickly as possible when booting the VM, before starting ntpd as a daemon, run sntp as explained in the documentation for Deprecating ntpdate.
answered Apr 23 '13 at 4:45
sciurussciurus
11k22043
that would work, however it takes ~3 minutes for ntpd to synchronize... which is a really long time.
– timeout
Apr 23 '13 at 16:07
This comment about sync time might be helpful for you. lists.ntp.org/pipermail/questions/2006-November/012096.html
– sciurus
Apr 24 '13 at 1:10
add a comment |
If your application requires the clock to be synced, add ntp-wait to its init script before it is started. Usage is simple, but here is the man page.
EDIT: If you want to sync time as quickly as possible when booting the VM, before starting ntpd as a daemon, run sntp as explained in the documentation for Deprecating ntpdate.
answered Apr 23 '13 at 4:45
sciurussciurus
11k22043
If your application requires the clock to be synced, add ntp-wait to its init script before it is started. Usage is simple, but here is the man page.
EDIT: If you want to sync time as quickly as possible when booting the VM, before starting ntpd as a daemon, run sntp as explained in the documentation for Deprecating ntpdate.
answered Apr 23 '13 at 4:45
sciurussciurus
11k22043
edited Apr 24 '13 at 1:20
answered Apr 23 '13 at 4:45
sciurussciurus
11k22043
answered Apr 23 '13 at 4:45
sciurussciurus
11k22043
answered Apr 23 '13 at 4:45
sciurussciurus
11k22043
11k22043
that would work, however it takes ~3 minutes for ntpd to synchronize... which is a really long time.
– timeout
Apr 23 '13 at 16:07
This comment about sync time might be helpful for you. lists.ntp.org/pipermail/questions/2006-November/012096.html
– sciurus
Apr 24 '13 at 1:10
add a comment |
that would work, however it takes ~3 minutes for ntpd to synchronize... which is a really long time.
– timeout
Apr 23 '13 at 16:07
This comment about sync time might be helpful for you. lists.ntp.org/pipermail/questions/2006-November/012096.html
– sciurus
Apr 24 '13 at 1:10
that would work, however it takes ~3 minutes for ntpd to synchronize... which is a really long time.
– timeout
Apr 23 '13 at 16:07
that would work, however it takes ~3 minutes for ntpd to synchronize... which is a really long time.
– timeout
Apr 23 '13 at 16:07
This comment about sync time might be helpful for you. lists.ntp.org/pipermail/questions/2006-November/012096.html
– sciurus
Apr 24 '13 at 1:10
This comment about sync time might be helpful for you. lists.ntp.org/pipermail/questions/2006-November/012096.html
– sciurus
Apr 24 '13 at 1:10
add a comment |
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