You may need to get and make the CentOS-7.8.iso available as well as a repository the hard part in doing what you want to do is following what yum update tells you is missing and then however getting those rpms. ![]() Also cp /etc// /etc//update.repo and edit its contents accordingly simply by changing the centos references to updates as in /root/repo/updates. ![]() Upon first creation of this update folder and after any new rpm file is added to this folder, you will need to do a rm /root/repo/update/repodata createrepo /root/repo/updates yum clean all so yum will recognize the contents in there immediately afterward. And then as you gather those rpm files, my suggestion is simply set up a second offline repository such as /root/repo/updates and just populate this folder with however many rpm files. But I will be $1 that yum will squawk with many missing dependencies, which you will have to run down. Doing a yum update will then see the contents of this centos-7.9 repository and be a first step in the possibility of it updating to version 7.9.
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