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Debian, Ubuntu and OpenSUSE Leap all support in-place upgrades between major versions. RedHat/CentOS do not.

mroche 4y ago
Red Hat does support in-place upgrades for RHEL via Leapp, and the process around this has been improving. Granted I know in the past this process was... sub-optimal and restrictive. It is true that CentOS has not supported this. I am hoping we can achieve a "dnf system-upgrade" process on RHEL, but we'll see how that goes. RHEL 7 -> RHEL 8: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/upgrading_from_rhel_7_to_rhel_8/index https://access.redhat.com/documentation/en-us/red_hat_enterp... RHEL 8 -> RHEL 9: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/upgrading_from_rhel_8_to_rhel_9/index https://access.redhat.com/documentation/en-us/red_hat_enterp... We still recommend having strong backup, rebuild, and automation strategies regardless. I personally would rather spin up a side system, ensure everything works, and nuke the original. That would apply to either test a in-place upgrade or a from-scratch build.
- rubyist5eva 4y ago
  I’ve only ever heard negative things about Leapp and it always seemed like an unloved side thing, which is why I didn’t mention it.
worthless-trash 4y ago
I have dealt with many, many customers who update between major versions on RHEL while working in RH support.
- rubyist5eva 4y ago
  I’ve never heard good things about the experience of using leapp and it always seems like an unloved project. Upgrading major versions of RHEL is akin to jumping 5+ versions of Fedora at once and I don’t think it could ever really work well without waaaaay too much work that probably isn’t worth it. The Alma Linux “elevate” project seems to be attempting that using leapp as a framework but also allowing migration between RHEL derivatives so we’ll see how that pans out I guess.
  - worthless-trash 4y ago
    I also dont 'like' it but it is supported. Red Hat also has a project called 'convert2rhel' which i imagine is similiar to elevate.

Red Hat does support in-place upgrades for RHEL via Leapp, and the process around this has been improving. Granted I know in the past this process was... sub-optimal and restrictive. It is true that CentOS has not supported this. I am hoping we can achieve a "dnf system-upgrade" process on RHEL, but we'll see how that goes. RHEL 7 -> RHEL 8: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/upgrading_from_rhel_7_to_rhel_8/index https://access.redhat.com/documentation/en-us/red_hat_enterp... RHEL 8 -> RHEL 9: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/upgrading_from_rhel_8_to_rhel_9/index https://access.redhat.com/documentation/en-us/red_hat_enterp... We still recommend having strong backup, rebuild, and automation strategies regardless. I personally would rather spin up a side system, ensure everything works, and nuke the original. That would apply to either test a in-place upgrade or a from-scratch build.

rubyist5eva 4y ago
I’ve only ever heard negative things about Leapp and it always seemed like an unloved side thing, which is why I didn’t mention it.

worthless-trash 4y ago

I have dealt with many, many customers who update between major versions on RHEL while working in RH support.

rubyist5eva 4y ago
I’ve never heard good things about the experience of using leapp and it always seems like an unloved project. Upgrading major versions of RHEL is akin to jumping 5+ versions of Fedora at once and I don’t think it could ever really work well without waaaaay too much work that probably isn’t worth it. The Alma Linux “elevate” project seems to be attempting that using leapp as a framework but also allowing migration between RHEL derivatives so we’ll see how that pans out I guess.
- worthless-trash 4y ago
  I also dont 'like' it but it is supported. Red Hat also has a project called 'convert2rhel' which i imagine is similiar to elevate.