Centos7更新yum源
备份yum源http://i2.运维网.com/images/blog/201811/20/d7aa0a5019f829f3989fbe049bbccd07.png
获取网易的yum源文件
http://i2.运维网.com/images/blog/201811/20/f05fa3d0e6b08b2c87d03cf1582528cb.png
由错误信息知dns没有解析成功，配置dns
http://i2.运维网.com/images/blog/201811/20/538da92057e37d4f5123b2f5eeb886ae.png
http://i2.运维网.com/images/blog/201811/20/bfc004f2a505ecf00fcd4390a1a9b9c9.png
http://i2.运维网.com/images/blog/201811/20/fec05ebce84acb46ca9fd09553926e0f.png
网络通畅，重新获取网易的yum源文件
http://i2.运维网.com/images/blog/201811/20/7431baf9f54f0c361170876904c8d027.png
清除yum缓存
http://i2.运维网.com/images/blog/201811/20/ba4322da2435128ad2839c069274c444.png
缓存安装包信息
http://i2.运维网.com/images/blog/201811/20/bb908f3fb4333b4ce13d71679d6548e8.png
完成
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