Weblog entry #13 for lters
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#13
Xen Servers and Time
Posted by lters on Tue 15 Apr 2008 at 21:10
With a new install of Xen and Etch, than using the xen tools to install a new copy of Etch, the time seems to stay off.
The system has minimal config changes and creating the xen client looks like this:
Installing ntpdate and running ntpdate -b myntpserver does not seem to fix it.
Tzconfig changes the timezone but does not fix it.
It still seems to be about 5 hours off.
Why is a xen client different than regular Etch?
The system has minimal config changes and creating the xen client looks like this:
xen-create-image --hostname Xrrr.my.flat --ip 10.1.1.1 --dist etch
Installing ntpdate and running ntpdate -b myntpserver does not seem to fix it.
Tzconfig changes the timezone but does not fix it.
It still seems to be about 5 hours off.
Why is a xen client different than regular Etch?
Comments on this Entry
IIRC, if you set the time properly in the Xen dom0, all the domU servers will automatically get the right time. So do the ntpdate/ntpd stuff there instead, since ntpdate/ntpd don't work in Xen domU servers anyway.
[ Parent | Reply to this comment ]
Posted by Anonymous (217.237.xx.xx) on Wed 16 Apr 2008 at 08:11
I can remember having the same problem on multiple xen machines and I think on hardware machines too. They were also 5-6h off.
I m not 100% sure what fixed it for me, but I think I did something with the links to /usr/share/zoneinfo/Europe/Berlin or I wrote into /etc/timezone Europe/Berlin by Hand. Something didnt work right with tzconfig I think.
Sorry for not giving more details.
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Yes.... I compared my homeserver and a xen server at work. At home /etc/localtime is symlinked to /usr/share/zoneinfo/Europe/Berlin. I think at work I piped the content of Berlin to localtime directly for some reason. (But still, I run ntp)
I m not 100% sure what fixed it for me, but I think I did something with the links to /usr/share/zoneinfo/Europe/Berlin or I wrote into /etc/timezone Europe/Berlin by Hand. Something didnt work right with tzconfig I think.
Sorry for not giving more details.
---------------------------
Yes.... I compared my homeserver and a xen server at work. At home /etc/localtime is symlinked to /usr/share/zoneinfo/Europe/Berlin. I think at work I piped the content of Berlin to localtime directly for some reason. (But still, I run ntp)
[ Parent | Reply to this comment ]
I don't know why is necessary, but you have to run tzconfig and choose your alternative "again" to clock works
[ Parent | Reply to this comment ]
Posted by lters (69.176.xx.xx) on Wed 16 Apr 2008 at 12:53
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Thanks for the comments.
I did not have Dom0 working right.
Fixing that fixed the problem.
respectfully, lters
I did not have Dom0 working right.
Fixing that fixed the problem.
respectfully, lters
[ Parent | Reply to this comment ]