把 CentOS6.5 默认的 python2.6 升级到了 python2.7，然后运行 yum 命令的时候就出现了错误：
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There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: No module named yum Please install a package which provides this module, or verify that the module is installed correctly. It"s possible that the above module doesn"t match the current version of Python, which is: 2.7.13 (default, Aug 18 2017, 21:52:09) [GCC 4.4.7 20120313 (Red Hat 4.4.7-18)] If you cannot solve this problem yourself, please go to the yum faq at: https://yum.baseurl.org/wiki/Faq |
原因是因为 yum 是用 python 写的，并不兼容 2.7，所以运行会报错。解决办法是修改 yum 源文件，指定 python 版本为老版本。
前提是升级的时候按照要求备份了老版本的软链接。
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vi /usr/bin/yum |
修改第一行
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#!/usr/bin/python |
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#!/usr/bin/python26 |
搞定
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