Hi,

I was trying to check on DST 2007 support in CentOS 4.4 but didn't find anything in a search.

Should I assume that it's been included in a patch and if I'm up to date via yum, I'm good?

Thanks.

You should be ready as long as you have the latest tzdata rpm package in place;

tzdata-2006m-3.el4.noarch.rpm 26-Nov-2006 13:09 444K

After I applied the patch to 'tzdata-2006m-3.el4' I ran the following:

zdump -v /etc/localtime | grep 2007
/etc/localtime Sun Apr 1 09:59:59 2007 UTC = Sun Apr 1 01:59:59 2007 PST isdst=0 gmtoff=-28800
/etc/localtime Sun Apr 1 10:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 PDT isdst=1 gmtoff=-25200
/etc/localtime Sun Oct 28 08:59:59 2007 UTC = Sun Oct 28 01:59:59 2007 PDT isdst=1 gmtoff=-25200
/etc/localtime Sun Oct 28 09:00:00 2007 UTC = Sun Oct 28 01:00:00 2007 PST isdst=0 gmtoff=-28800

Which I had read to use to confirm you were supporting the 2007 DST and it appears that it is not.

There is a tzdata 2007a but there doesn't appear to be a package for that data yet.

Try this one, sorry about having to make a zip file. No other way to attach it to this reply.

$ zdump -v /etc/localtime | grep 2007
/etc/localtime Sun Mar 11 06:59:59 2007 UTC = Sun Mar 11 01:59:59 2007 EST isdst=0 gmtoff=-18000
/etc/localtime Sun Mar 11 07:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 EDT isdst=1 gmtoff=-14400
/etc/localtime Sun Nov 4 05:59:59 2007 UTC = Sun Nov 4 01:59:59 2007 EDT isdst=1 gmtoff=-14400
/etc/localtime Sun Nov 4 06:00:00 2007 UTC = Sun Nov 4 01:00:00 2007 EST isdst=0 gmtoff=-18000

Not sure what I did wrong but I installed the package and I still get April.

rpm -qa|egrep tzdata
tzdata-2007a-1

zdump -v /etc/localtime | grep 2007
/etc/localtime Sun Apr 1 09:59:59 2007 UTC = Sun Apr 1 01:59:59 2007 PST isdst=0 gmtoff=-28800
/etc/localtime Sun Apr 1 10:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 PDT isdst=1 gmtoff=-25200
/etc/localtime Sun Oct 28 08:59:59 2007 UTC = Sun Oct 28 01:59:59 2007 PDT isdst=1 gmtoff=-25200
/etc/localtime Sun Oct 28 09:00:00 2007 UTC = Sun Oct 28 01:00:00 2007 PST isdst=0 gmtoff=-28800

This is a src.rpm file after installing you have to build then install the binary, typically as root from the console or xterm session;

cd /udr/src/redhat/SPCES
rpmbuild -bb tzdata.spec

Watch the output it will tell you where the binary rpm package is that need to be installed;

rpm -Uvh tzdata-2007a-1.noarch.rpm

Usually if you build as root (which not a good idea) it will be found in the /etc/redhat/RPMS/noarch directory location after building.

I had built it with

rpmbuild --rebuild tzdata-2007a-1.el4.src.rpm

and updated:

rpm -U tzdata-2007a-1.noarch.rpm

It shows tzdata-2007a-1 is installed.

and I still get:

zdump -v /etc/localtime | grep 2007
/etc/localtime Sun Apr 1 09:59:59 2007 UTC = Sun Apr 1 01:59:59 2007 PST isdst=0 gmtoff=-28800
/etc/localtime Sun Apr 1 10:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 PDT isdst=1 gmtoff=-25200
/etc/localtime Sun Oct 28 08:59:59 2007 UTC = Sun Oct 28 01:59:59 2007 PDT isdst=1 gmtoff=-25200
/etc/localtime Sun Oct 28 09:00:00 2007 UTC = Sun Oct 28 01:00:00 2007 PST isdst=0 gmtoff=-28800

So I'm not sure what I'm doing wrong.

Show the output from the typed command, please; /bin/rpm -qa --qf="%{n}-%{v}-%{r}.%{arch}\n" tzdata

FYI: you do not really need to install tzdata-2007a-1.noarch.rpm package, just use rpm2cpio and cpio and copy the extracted /usr/share/zoneinfo files to the /usr/share/zoneinfo directory.

rpm2cpio < tzdata-2007a-1.noarch.rpm > tzdata.cpio
cpio -i -d < tzdata.cpio

If all else fails then try the tzdata-2007a-1.noarch.rpm from Fedora Development.

if its any consolation, i just performed yum update on my centos 4.4 systems and it is now showing the correct dates.

My problems were related to not replacing localtime after the update was applied. It was a step I missed seeing I ran into in another doc. So if anyone else is having problems make sure you copy over /etc/localtime after the update if you are not using a symbolic link.

All is well now thanks for the feedback.

Quote:

Lenard,
I forgot all about rpm2cpio and cpio (don't use those too very often).

I have a OLD rh6.2 ppp/paging/sendmail box and no support for this years DST changes (don't ask).
Replacing it w/centOS is on the list, and your post gave me some breathing room...worked like a charm :D

thank you sir!
manny

You are welcome, glad to help.

Yea, I use rp2cpio and cpio rarely myself, I keep examples in a rarely used commands.txt file for reference. Some other examples;

When making an ISO from an existing factory created CD, create and verify
the ISO against the CD using rawread as follows:

rawread /dev/cdrom > myiso.iso
rawread /dev/cdrom | md5sum
md5sum myiso.iso

Getting the CD/DVD volume information;
/lib/udev/vol_id --export /dev/hdc

Mount the cdrom media for access being used in the rescue mode;

# mknod /tmp/tmpcdrom b 22 0
# mount -t iso9660 /tmp/tmpcdrom /cdrom

Fun with .bash_history

Disable history;
rm .bash_history
touch .bash_history
sudo chattr +i .bash_history

Enable history;
sudo chattr -i .bash_history

I've got CentOS 3.8 machines and CentOS 4.4 machines and I haven't done anything special to them except for keeping them (yum) updated and I get the correct zdump output for 2007. Is there any particular reason you guys are having to install this tzdata rpm?

If a system is configured to use NTP will NTP take care of DST issues?

How does NTP work anyway? Does it set the internal "seconds since 1971" clock and let the system
interpret the what the seconds mean? Or does it provide a date string, similar to setting the time manually at the
command line, using "date ...." for example?

How often does NTP update the system time?

Wikipedia to the rescue!

Quote:
Have you heard of Coordinated Universal Time / Temps Universel Coordonné? (See UTC Time Zones)

Quote:
Network Time Protocol (See NTP Timestamps)

I am really struggling trying to figure out how to update my CentOS server to the new DST. I've followed this thread but am now lost.

I have the file tzdata-2007a-1.el4.src.rpm.zip downloaded, extracted, and copied to my server.

A couple of the post mention running rpmbuild. I don't have that file on my server. The /usr/src folder it is suppose to be under is empty on my server.

I can run these 2 commands:

rpm2cpio < tzdata-2007a-1.noarch.rpm > tzdata.cpio
cpio -i -d < tzdata.cpio

Which gives me 4 new files in the folder:
tzdata.cpio
tzdata.spec
tzdata2007a.tar.gz
tzdata-base-0.tar.bz2

So now what do I do with these files? The post says to copy the extracted /usr/share/zoneinfo files to the /usr/share/zoneinfo directory. Are they talking about the 3 newly extracted files listed above? If so those files don't already exist in that folder so I'm not sure what good that will do.

I am a total Linux newbie and don't know a thing about updating the OS or using rpms. Any help would be GREATLY appreciated!!

you want to run "rpmbuild --rebuild tzdata-2007a-1.el4.src.rpm.zip" and install the tzdata*.noarch.rpm package that you get

jhadzima: As several people have pointed out: If you are up-to-date, then you shouldn’t have a problem.

For the life of me I cannot get this done... I yum update tzdata and the rpm gets installed thought the zdump does not reflect the march 11th date. Can some one throw me a bone here :).

My latest iteration is to build the rpm src--to no avail:

[root@bb ~]# cat /etc/redhat-release
CentOS release 4.4 (Final)

[root@bb ~]# rpm -qa | grep -i tzdata
tzdata-2007a-1

[root@bb ~]# zdump -v /etc/localtime | grep 2007
/etc/localtime Sun Apr 1 09:59:59 2007 UTC = Sun Apr 1 01:59:59 2007 PST isdst=0 gmtoff=-28800
/etc/localtime Sun Apr 1 10:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 PDT isdst=1 gmtoff=-25200
/etc/localtime Sun Oct 28 08:59:59 2007 UTC = Sun Oct 28 01:59:59 2007 PDT isdst=1 gmtoff=-25200
/etc/localtime Sun Oct 28 09:00:00 2007 UTC = Sun Oct 28 01:00:00 2007 PST isdst=0 gmtoff=-28800

Thanks,

Harison

Did you run timeconfig ?