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Topic: Ponderings about daylight savings changes (Read 9780 times) |
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Nathan Mundhenk
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Ponderings about daylight savings changes
« on: 02/27/07 at 20:43:51 » |
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Apparently due to some bill passed in 2005, the dates for daylight savings time have been changed. I know that all windows machines have to be patched. Does anyone know if the Linux machines are affected? Some of our servers I know are running MDK 2005. This might just be a silly Microsoft issue and how they deal with DST. Any ideas?
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T. Nathan Mundhenk
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Rob Peters
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Re: Ponderings about daylight savings changes
« Reply #1 on: 02/27/07 at 22:49:06 » |
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The linux systems will need a glibc upgrade which should be easy to retrieve through the distro's native package management system. I found this page: http://www-1.ibm.com/support/docview.wss?rs=0&q1=T1010301&uid=is g3T1010301&loc=en_US&cs=utf-8&cc=us&lang=en which suggests the following to test whether a system is properly updated or not:
Quote:Confirmation of Linux fix
You may test for the presence of the fix by examining the DST settings on the live system. You will run the command:
# zdump -v CST6CDT | grep 2007
On a system without the adjustments you will see:
CST6CDT Sun Apr 1 07:59:59 2007 UTC = Sun Apr 1 01:59:59 2007 CST isdst=0 mtoff=-21600
CST6CDT Sun Apr 1 08:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 CST isdst=0 mtoff=-18000
CST6CDT Sun Oct 28 06:59:59 2007 UTC = Sun Oct 28 01:59:59 2007 CST isdst=0 gmtoff=-18000
CST6CDT Sun Oct 28 07:00:00 2007 UTC = Sun Oct 28 01:00:00 2007 CST isdst=0 gmtoff=-21600
On a system with the adjustments you will see:
CST6CDT Sun Mar 11 07:59:59 2007 UTC = Sun Mar 11 01:59:59 2007 CST isdst=0 gmtoff=-21600
CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CST isdst=0 gmtoff=-18600
CST6CDT Sun Nov 4 06:59:59 2007 UTC = Sun Nov 4 01:59:59 2007 CST isdst=0 gmtoff=-18600
CST6CDT Sun Nov 4 07:00:00 2007 UTC = Sun Nov 4 01:00:00 2007 CST isdst=0 gmtoff=-21600
Notice that the April and October dates were changed to March and November. |
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I ran this script to quickly test all the machines that I could find online:
Code:for m in ilab1 ilab6 ilab9 ilab12 ilab13 ilab15 ilab16 iraid ibeo imaster n01 n02 n03 n04 n05 n07 n08; do
info=`ssh $m "zdump -v CST6CDT | fgrep '00 2007 CDT isdst=1'"`
printf "%-7s:%s\n" "$m" "$info"
done |
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and got these results:
ilab1 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
ilab6 :CST6CDT Sun Apr 1 08:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 CDT isdst=1 gmtoff=-18000
ilab9 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
ilab12 :CST6CDT Sun Apr 1 08:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 CDT isdst=1 gmtoff=-18000
ilab13 :CST6CDT Sun Apr 1 08:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 CDT isdst=1 gmtoff=-18000
ilab15 :CST6CDT Sun Apr 1 08:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 CDT isdst=1 gmtoff=-18000
ilab16 :CST6CDT Sun Apr 1 08:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 CDT isdst=1 gmtoff=-18000
iraid :CST6CDT Sun Apr 1 08:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 CDT isdst=1 gmtoff=-18000
ibeo :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
imaster:CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
n01 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
n02 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
n03 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
n04 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
n05 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
n07 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
n08 :CST6CDT Sun Mar 11 08:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 CDT isdst=1 gmtoff=-18000
So it looks like ilab6, ilab12, ilab13, ilab15, ilab16, and iraid all still need updated timezone data.
Cheers,
Rob
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Laurent Itti
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Re: Ponderings about daylight savings changes
« Reply #2 on: 02/27/07 at 23:10:31 » |
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great, thanks guys! I believe iLab will need an update as well. Basically all machines which are running anything older than Mandriva 2007. Great chance to upgrade the OS on these machines.
best,
-- laurent
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