История изменений

https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool

https://www.centos.org/forums/viewtopic.php?t=67123

У ТСа нет коммерческой поддержки (подписки) и не RHEL, а там да, можно:

https://access.redhat.com/solutions/637583

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html...

да и то:

Limited package groups: The upgrade process handles only the following package groups and packages: Minimal (@minimal), Base (@base), Web Server (@web-server), DHCP Server, File Server (@nfs-server), CIFS File Server and Print Server (@print-server). Although upgrades of other packages and groups are not supported, in some cases, packages can be uninstalled from the RHEL 6 system and reinstalled on the upgraded RHEL 7 system without a problem. See the table below.

https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool

https://www.centos.org/forums/viewtopic.php?t=67123

У ТСа нет коммерческой поддержки (подписки) и не RHEL, а там да, можно:

https://access.redhat.com/solutions/637583

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html...

да и то:

Limited package groups: The upgrade process handles only the following package groups and packages: Minimal (@minimal), Base (@base), Web Server (@web-server), DHCP Server, File Server (@nfs-server), CIFS File Server and Print Server (@print-server). Although upgrades of other packages and groups are not supported, in some cases, packages can be uninstalled from the RHEL 6 system and reinstalled on the upgraded RHEL 7 system without a problem. See the table below.

https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool

https://www.centos.org/forums/viewtopic.php?t=67123

У ТСа нет коммерческой поддержки (подписки) и не RHEL, а там да, можно:

https://access.redhat.com/solutions/637583

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html...

https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool

https://www.centos.org/forums/viewtopic.php?t=67123

У ТСа нет коммерческой поддержки (подписки) и не RHEL

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html...