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https://blog.csdn.net/QingKong999/article/details/79114925
Centos6.5跨越大版本升级到Centos7.4 - Linux学习与应用 - CSDN博客
https://blog.csdn.net/whbttst/article/details/80534852
Centos 6.x 升级到 7 - 晴空999 - CSDN博客
https://blog.csdn.net/QingKong999/article/details/79114925