1. Environment: redhat 6.5
2. Problem: mirrors.163.com URL version 6.5 yum source is gone, only version 6 (available). But if you want to change it to the yum source of 6.5 in vault.centos.org.com, the one modified by rhel-source.repo is like 3 (the red box is changed according to the previous 163.com, and so is the one below)
3.
4. But an error occurred in, yum makecache after the change
5. Thank you very much for helping me point out what went wrong