Upgrading CentOS 6 to 7 or 8

[rgoldman]

Hello

Is there an upgrade path to CentOS 7/8 from CentOS 6? What are you doing in these cases?

Thanks

[TrevorH]

There is no upgrade from one major version to another. It's a reinstall. Everything is significantly different in each new version, usually encompassing about 4 years worth of Fedora changes in one lump.

[jlehtone]

What are you doing in these cases?

A separate test install first, for example into VM, to study and learn how the new version is to be configured and used.

Furthermore, I often install to separate partition so that I can dual boot or at least mount the root(s) of the previous versions to access older config(s).

For "real production", kickstart installations followed by ansible deploying and maintaining additional config. It might take some iterations at staging to get that right, but eventually reinstalling ten or thousand nodes makes no difference.