Centos 7 to 8 update.

[helloha]

Hello all,

Newbie question,

I want to upgrade from Centos 7 to 8. Can anyone tell me if I need to disable repos from centos7 in order to do so? Right now I get error messages like the ones below.

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file /usr/lib/python2.7/site-packages/six.py from install of python2-six-1.11.0-5.module_el8.2.0+381+9a5b3c3b.noarch conflicts with file from package python-six-1.9.0-2.el7.noarch

This is my list of repositories.

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repo id                                       repo name                                                                            status
AppStream                                     CentOS-8 - AppStream                                                                 4935
BaseOS                                        CentOS-8 - Base                                                                      1673
centos-sclo-rh                                CentOS-7 - SCLo rh                                                                   6943
centos-sclo-sclo                              CentOS-7 - SCLo sclo                                                                  802
epel                                          Extra Packages for Enterprise Linux 8 - x86_64                                       6431
epel-modular                                  Extra Packages for Enterprise Linux Modular 8 - x86_64                                  0
extras                                        CentOS-8 - Extras                                                                      26
pgdg-common                                   PostgreSQL common RPMs for RHEL/CentOS 8 - x86_64                                     320
pgdg10                                        PostgreSQL 10 for RHEL/CentOS 8 - x86_64                                              384
pgdg11                                        PostgreSQL 11 for RHEL/CentOS 8 - x86_64                                              422
pgdg12                                        PostgreSQL 12 for RHEL/CentOS 8 - x86_64                                              257
pgdg95                                        PostgreSQL 9.5 for RHEL/CentOS 8 - x86_64                                             251
pgdg96                                        PostgreSQL 9.6 for RHEL/CentOS 8 - x86_64                                             370
teamviewer                                    TeamViewer - x86_64                                                                   105
yarn                                          Yarn Repository                                                                        51

It' is the first time I do a complete version upgrade. I can find a few guides online but I run into this issue.

https://www.howtoforge.com/how-to-upgra ... core-to-8/
https://www.tecmint.com/upgrade-centos-7-to-centos-8/

THX for any help!

[TrevorH]

There is no upgrade from one major version to another. Back up your data and settings, reinstall the system, reinstall your apps, restore your data.

There are "guides" on the internet that allege they can upgrade but most of them are broken or untested. Do not use them.

[helloha]

Ok then I'll just hold off, don't need the work of migrating. So I assume I remove all repos refering to CentOs8? Because whenever I update it wil refer to them as well?

Regards,
Karel.

[TrevorH]

Yes, you need to reverse the steps you have taken so far.

[helloha]

Just wondering if I already messed things up and installed 8 partly or something...

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[root@localhost ~]# cat /etc/os-release
NAME="CentOS Linux"
VERSION="8 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

[code]CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="8"

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[root@localhost ~]# uname -r
3.10.0-1127.19.1.el7.x86_64

[KernelOops]

Your migration just came earlier than expected

[helloha]

Yes but the kernel is still on v7?

[jlehtone]

You have either not installed kernel from el8 repo or haven't rebooted to it yet.

The /etc/os-release comes in some package. See:

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rpm -qf /etc/os-release

yum provides /etc/os-release

You can/should undo those changes by restoring the corresponding el7 packages.

[TrevorH]

Given what you've posted so far I think I'd recommend breaking out your backups and going back to the version of the system you had before you started.