Migrate from Centos6


What is best procedure to Migrate on RockLinux from an old Centos6.10


There is no migration path from CentOS 6. Best way, simply make a new machine and install everything from zero. Any data, copy between the old and new machines.

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Indeed. Fresh install, apply configuration that achieves the same goals as in old system but by best practices of new system, and finally transfer user data.

Rocky has SystemD, NetworkManager, FirewallD as frontend to nftables, and whatnot. CentOS 6 had almost nothing of that.