On 9/29/21 8:29 AM, J Martin Rushton via CentOS wrote:
It's not supported. RH has a method that sometimes works for RHEL, but there is no safe CentOS way to do a major upgrade. You need to reinstall the OS and migrate your applications.
+1 The system "binary clone" of which CentOS is (or was rather) is not designed to be "upgraded". The routine way is: install new release, copy all accounts, and data from old system to it, install services, configure them to a degree possible close to what was on old system.
This horse have been beaten to death. The problem someone asking this is a consequence it people not doing search first (I for one use duckduckgo), and reading all search reveals with open eyes, not picking something to one's liking. Like: I want to do an upgrade. No matter all search shows is: "install new release,...". I did find one post about upgrade. But why it doesn't work?! Just read any of other posts about upgrade, saying to the effect: it doesn't, shouldn't work, and going into various lengts of explaining why.
I know what I said doesn't make pleasant reading, but it hopefully will help someone with "modus operandi".
Valeri
On 29/09/2021 14:24, Gestió Servidors wrote:
Hi,
I'm doing some tests of upgrading CentOS from 7 to 8 reading this step-by-step guide: https://netshopisp.medium.com/how-to-upgrade-linux-servecentos-7-to-centos-8...
I'm trying this upgrade in a VM, so I can save "snapshots" and restart in a past saved point. However, all my test ends wrong, exacly in Step 4 when I run "rpm -e `rpm -q kernel`". Then, systems says that some packages are kernel dependencies. After I remove that dependencies, I can't remove kernel...
Anybody has tested process upgrade from 7 to 8?
Thanks.
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