[CentOS] UP vs SMP kernel ?

Robert kerplop at sbcglobal.net
Fri Oct 28 16:33:27 UTC 2005


There was a discussion here several days ago that was precipitated by my 
decision to manually install the new kernel before YUMming the upgrade 
to CentOS 4.2.  The upgrade went south but I recovered by doing a fresh 
install and a bunch of copying from backups. All's well EXCEPT that I'm 
back in the same "box", thanks to anaconda. 

I set out to upgrade kernels this morning:

[root at mavis download]# yum update kernel\*
Setting up Update Process
Setting up repositories
dag                       100% |=========================| 1.1 kB    00:00
update                    100% |=========================|  951 B    00:00
base                      100% |=========================| 1.1 kB    00:00
addons                    100% |=========================|  951 B    00:00
extras                    100% |=========================| 1.1 kB    00:00
Reading repository metadata in from local files
Resolving Dependencies
--> Populating transaction set with selected packages. Please wait.
---> Downloading header for kernel-hugemem-devel to pack into 
transaction set.
kernel-hugemem-devel-2.6. 100% |=========================| 656 kB    00:04
---> Package kernel-hugemem-devel.i686 0:2.6.9-22.0.1.EL set to be updated
---> Downloading header for kernel-smp-devel to pack into transaction set.
kernel-smp-devel-2.6.9-22 100% |=========================| 648 kB    00:04
---> Package kernel-smp-devel.i686 0:2.6.9-22.0.1.EL set to be updated
---> Downloading header for kernel-devel to pack into transaction set.
kernel-devel-2.6.9-22.0.1 100% |=========================| 642 kB    00:04
---> Package kernel-devel.i686 0:2.6.9-22.0.1.EL set to be installed
---> Downloading header for kernel to pack into transaction set.
kernel-2.6.9-22.0.1.EL.i6 100% |=========================| 151 kB    00:00
---> Package kernel.i686 0:2.6.9-22.0.1.EL set to be installed
---> Downloading header for kernel-smp to pack into transaction set.
kernel-smp-2.6.9-22.0.1.E 100% |=========================| 151 kB    00:00
---> Package kernel-smp.i686 0:2.6.9-22.0.1.EL set to be installed
---> Downloading header for kernel-doc to pack into transaction set.
kernel-doc-2.6.9-22.0.1.E 100% |=========================| 123 kB    00:00
---> Package kernel-doc.noarch 0:2.6.9-22.0.1.EL set to be updated
--> Running transaction check

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Installing:
 kernel                  i686       2.6.9-22.0.1.EL  update            9.7 M
 kernel-devel            i686       2.6.9-22.0.1.EL  update            3.6 M
 kernel-smp              i686       2.6.9-22.0.1.EL  update            9.4 M
Updating:
 kernel-doc              noarch     2.6.9-22.0.1.EL  update            2.0 M
 kernel-hugemem-devel    i686       2.6.9-22.0.1.EL  update            3.6 M
 kernel-smp-devel        i686       2.6.9-22.0.1.EL  update            3.6 M

Transaction Summary
=============================================================================
Install      3 Package(s)
Update       3 Package(s)
Remove       0 Package(s)
Total download size: 32 M
Is this ok [y/N]: n
Exiting on user Command
Complete!
You have new mail in /var/spool/mail/root
[root at mavis download]# rpm -qa | grep kernel
kernel-smp-devel-2.6.9-22.EL
kernel-2.6.9-22.EL
kernel-hugemem-devel-2.6.9-22.EL
kernel-utils-2.4-13.1.69
kernel-devel-2.6.9-22.EL
kernel-doc-2.6.9-22.EL
kernel-smp-2.6.9-22.EL
[root at mavis 
download]#                                                                 

...and was reminded that anaconda installed both kernels from the CentOS 
4.2 DVD. 

I verified that I had, indeed repaired /boot/grub/grub.conf following 
the install:
[root at mavis download]# cat /etc/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
#          initrd /initrd-version.img
#boot=/dev/hdb
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
#hiddenmenu
title CentOS-4 i386-up (2.6.9-22.EL)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-22.EL ro root=/dev/VolGroup00/LogVol00
        initrd /initrd-2.6.9-22.EL.img
You have new mail in /var/spool/mail/root

Then, I proceeded with the kernel upgrade and checked grub.conf again

[root at mavis download]# cat /etc/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
#          initrd /initrd-version.img
#boot=/dev/hdb
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
#hiddenmenu
title CentOS (2.6.9-22.0.1.ELsmp)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-22.0.1.ELsmp ro root=/dev/VolGroup00/LogVol00
        initrd /initrd-2.6.9-22.0.1.ELsmp.img
title CentOS (2.6.9-22.0.1.EL)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-22.0.1.EL ro root=/dev/VolGroup00/LogVol00
        initrd /initrd-2.6.9-22.0.1.EL.img
title CentOS-4 i386-up (2.6.9-22.EL)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-22.EL ro root=/dev/VolGroup00/LogVol00
        initrd /initrd-2.6.9-22.EL.img
You have new mail in /var/spool/mail/root
[root at mavis download]#                                             

To find that the ^%#$@ smp kernel is once more the default! 

And THAT is why this automagic stuff sometimes scares hell outta me.




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