Upgrading from CentOS 6 to CentOS 7 involves a manual approach, as the standard yum update and migration paths won’t work anymore.
CentOS 6 to 7 upgrades are inherently risky, especially with outdated repositories. Consider migrating directly to a modern distribution like Rocky Linux or AlmaLinux. Tools like ELevate can help with migration from CentOS 6/7 to newer distributions.
The ELevate Project by AlmaLinux offers a community-supported tool for upgrading CentOS 7 to newer RHEL-based distributions. While it doesn’t support CentOS 6 directly, you could consider upgrading from CentOS 6 to 7 first, then use ELevate for further upgrades.