I have two CentOS Linux servers. One is dev and the other is prod. Dev is internal only and prod is exposed on port 80.

Both built at the same time and both configured pretty closely to the same with, perhaps, a few deviations on the dev box along the way...

They've always been within a day of each other when notifying me of updates. However, that changed this week.

Last weekend the dev box notified me of 3 updates. Kernel, kernel-headers and kernel-devel. I applied them. The prod box has yet to need those.

Yesterday, the dev box notified me of 178 updates. I just manually ran a sudo yum update on prod. Still needs none.

Should I be concerned? Anything specifically that I should check? I can add the list of 178 packages on request...

  • Prod uname -a

Linux EFhermes 2.6.18-164.el5 #1 SMP Thu Sep 3 03:33:56 EDT 2009 i686 i686 i386 GNU/Linux

  • Dev uname -a

Linux EFhermesDev 2.6.18-164.2.1.el5.plus #1 SMP Fri Oct 9 12:34:43 EDT 2009 i686 i686 i386 GNU/Linux


3 hours after posting this (24 hours after receiving update notifications for dev) I just got notified by prod that he has 161 updates available... still no kernel, but lots of other "major" components.


CentOS 5.4 was just released. I believe it's still making its way through the mirrors so check to see if the machines are using the same mirrors for their updates.

  • He's already got 5.4 on the Prod server, that is evident by the kernel version 2.6.18-164. – TCampbell Oct 22 '09 at 16:28
  • 5.4 was just released? Where do you find that out? The CentOS site is sure hiding it... – Chris_K Oct 22 '09 at 18:38
  • Yeah they haven't updated their website but I saw the news on my RSS feed of distrowatch.com. – 3dinfluence Oct 22 '09 at 20:20
  • 1
    It was also announced on CentOS's mailing list. lists.centos.org/pipermail/centos-announce/2009-October/… – 3dinfluence Oct 22 '09 at 20:22
  • @3dinfluence Thanks. I'm on that list, but just realized I haven't been getting anything from it. Reckon I'll go check the spam traps... – Chris_K Oct 22 '09 at 20:35

On developer machine repository centosplus is probably enabled.

  • enabled on both, actually (not that I recall WHY...) – Chris_K Oct 22 '09 at 18:42
  • I stand corrected. NOT enabled on prod. – Chris_K Oct 22 '09 at 18:46
  • Sounds like the issue to me – Josh Oct 22 '09 at 22:58
  • It may account for the (now currently) discrepancy of a couple dozen. Originally I was more freaked about the 178 discrepancy! – Chris_K Oct 22 '09 at 23:01

Try running:

yum clean all

To remove the cached headers, etc. Then try the update or check-update again.

  • good idea, but no change. – Chris_K Oct 22 '09 at 18:47

What is the output of cat /etc/issue on both systems?

  • on dev it is <blockquote>CentOS release 5.3 (Final) Kernel \r on an \m </blockquote> On prod it is the same. – Chris_K Oct 22 '09 at 18:34
  • Hm. Ok. Then my idea wasn't it. – Josh Oct 22 '09 at 22:59

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