[SOLVED] Migration from RHEL6 to CentOS6

a111 · Post by **a111** » 2011/07/11 04:47:27

I did this yesterday and works for me.

[b]for x86_64[/b]

[code]
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/centos-release-6-0.el6.centos.5.x86_64.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/centos-indexhtml-6-1.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-3.2.27-14.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.26-11.el6.noarch.rpm

yum remove rhnlib abrt-plugin-bugzilla redhat-release-notes*
rpm -e --nodeps redhat-release redhat-indexhtml
rpm -Uvh centos-release-6-0.el6.centos.5.x86_64.rpm centos-indexhtml-6-1.el6.centos.noarch.rpm \
yum-3.2.27-14.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.26-11.el6.noarch.rpm
yum clean all
yum upgrade
[/code]

[b]for x86[/b]

[code]
wget http://mirror.centos.org/centos/6/os/i386/Packages/centos-release-6-0.el6.centos.5.i686.rpm
wget http://mirror.centos.org/centos/6/os/i386/Packages/centos-indexhtml-6-1.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/i386/Packages/yum-3.2.27-14.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/i386/Packages/yum-plugin-fastestmirror-1.1.26-11.el6.noarch.rpm

yum remove rhnlib abrt-plugin-bugzilla redhat-release-notes*
rpm -e --nodeps redhat-release redhat-indexhtml
rpm -Uvh centos-release-6-0.el6.centos.5.686.rpm centos-indexhtml-6-1.el6.centos.noarch.rpm \
yum-3.2.27-14.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.26-11.el6.noarch.rpm
yum clean all
yum upgrade
[/code]

But fixme if this wrong or incomplete.

HenrykD · Post by **HenrykD** » 2011/07/11 06:13:47

It's working. I migrated my system from SL6 to CentOS6.

I changed only:
rpm -e --nodeps sl-release sl-indexhtml

pschaff · Post by **pschaff** » 2011/07/11 20:21:07

Looks good. Please see the [url=http://wiki.centos.org/HowTos/MigrationGuide]Migration Guide[/url] Wiki article.

hawaiian717 · Post by **hawaiian717** » 2011/07/12 00:08:06

I adapted these instructions into a shell script:

http://pastebin.centos.org/37588

Run it as root, obviously. I've only tested it on Scientific Linux 64-bit, but it should be able to convert both 32-bit and 64-bit versions of SL6 and RHEL6 to CentOS 6.

One thing I noticed is that after converting, there were still some SL packages installed. The VM I tested in uses the text-based boot screen, for whatever reason, and it still identifies itself as Scientific Linux. I noticed that the grub.conf file still describes the OS as SL, not CentOS, and looking at the kernel RPMs themselves, they're built by SL.

I think for my purposes this is good enough for now, and over time I'd expect that as new versions of CentOS packages come out, they'll replace the SL versions.

AlanBartlett · Post by **AlanBartlett** » 2011/07/12 02:49:17

[quote]
One thing I noticed is that after converting, there were still some SL packages installed. The VM I tested in uses the text-based boot screen, for whatever reason, and it still identifies itself as Scientific Linux. I noticed that the grub.conf file still describes the OS as SL, not CentOS, and looking at the kernel RPMs themselves, they're built by SL.

I think for my purposes this is good enough for now, and over time I'd expect that as new versions of CentOS packages come out, they'll replace the SL versions.
[/quote]
Regarding the above, I would recommend due consideration of usage of the [i][b]yum reinstall [/i][/b] command line. :-)

hawaiian717 · Post by **hawaiian717** » 2011/07/12 17:40:15

[quote]
AlanBartlett wrote:
Regarding the above, I would recommend due consideration of usage of the [i][b]yum reinstall [/i][/b] command line. :-)[/quote]

Note that may not always work. In some cases, SL6 has newer packages than have made their way to the CentOS 6 repos yet. The Plymouth packages and Firefox both required using [b]yum downgrade [/b] instead.

Also, I discovered today two additional SL-specific packages still on the system: sl-bookmarks and sl-release-notes. It looks like sl-bookmarks is replaced by redhat-bookmarks, though I haven't yet found what (if any) is the CentOS equivalent packet to sl-release-notes.

miguelito08 · Post by **miguelito08** » 2011/07/14 15:21:49

[quote]
HenrykD wrote:
It's working. I migrated my system from SL6 to CentOS6.

I changed only:
rpm -e --nodeps sl-release sl-indexhtml[/quote]

Hi

How you active the centos' repos when changed from SL6 to CentOS6

miguelito08 · Post by **miguelito08** » 2011/07/14 16:10:15

[quote]
miguelito08 wrote:
[quote]
HenrykD wrote:
It's working. I migrated my system from SL6 to CentOS6.

I changed only:
rpm -e --nodeps sl-release sl-indexhtml[/quote]

Hi

How you active the centos' repos when changed from SL6 to CentOS6[/quote]

Fixed

Thanks

G0d-servant · Post by **G0d-servant** » 2011/07/17 04:43:40

I follow this instructions:
[code]wget http://mirror.centos.org/centos/6/os/i386/Packages/centos-release-6-0.el6.centos.5.i686.rpm
wget http://mirror.centos.org/centos/6/os/i386/Packages/centos-indexhtml-6-1.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/i386/Packages/yum-3.2.27-14.el6.centos.noarch.rpm
wget http://mirror.centos.org/centos/6/os/i386/Packages/yum-plugin-fastestmirror-1.1.26-11.el6.noarch.rpm

yum remove rhnlib abrt-plugin-bugzilla redhat-release-notes*
rpm -e --nodeps redhat-release redhat-indexhtml
rpm -Uvh centos-release-6-0.el6.centos.5.686.rpm centos-indexhtml-6-1.el6.centos.noarch.rpm yum-3.2.27-14.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.26-11.el6.noarch.rpm
yum clean all
yum upgrade[/code]
but "/etc/yum/yum.repo.d" is empty. above instructions don't set default centos repo ?

pschaff · Post by **pschaff** » 2011/07/17 13:06:10

[quote]
G0d-servant wrote:
...
but "/etc/yum/yum.repo.d" is empty. above instructions don't set default centos repo ?[/quote]
That should be /etc/yum.repos.d/

CentOS