CentOS升級Python27後，yum不可用
阿新 • • 發佈：2018-12-29
之前一篇文章介紹了《Centos6.8升級Python2.6為Python2.7》，升級完畢後通過pip安裝依賴時不再提示版本過期，但是隨之而來的問題就是yum不好使了，例如會出現如下報錯
[[email protected] ~]# yum search jpegoptim 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, May 15 2017, 11:00:16) [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: http://yum.baseurl.org/wiki/Faq
問題原因是因為yum不支援python2.7的版本，那麼只需要在/usr/bin/yum中將第一行的#!/usr/bin/python更換為低版本即可。
vim /usr/bin/yum
原來的頭部宣告
#!/usr/bin/python
更換以後的頭部宣告
#!/usr/bin/python2.6
這個python2.6怎麼來的呢？
ll /usr/bin/py*
這裡就會看到系統自帶的以及我們升級後的python
[[email protected] ~]# ll /usr/bin/py* -rwxr-xr-x 1 root root 78 Aug 18 2016 /usr/bin/pydoc lrwxrwxrwx 1 root root 34 May 15 11:03 /usr/bin/python -> /usr/local/python2.7/bin/python2.7 lrwxrwxrwx 1 root root 6 Apr 16 23:02 /usr/bin/python2 -> python -rwxr-xr-x 2 root root 4864 Aug 18 2016 /usr/bin/python2.6 lrwxrwxrwx 1 root root 34 May 15 11:09 /usr/bin/python2.7 -> /usr/local/python2.7/bin/python2.7 -rwxr-xr-x 2 root root 4864 Aug 18 2016 /usr/bin/python_old
按下esc,並且鍵入:wq即可儲存修改。那麼現在yum包管理器就好使了：
[[email protected] ~]# yum search jpegoptim Loaded plugins: fastestmirror Repository epel is listed more than once in the configuration Loading mirror speeds from cached hostfile * base: mirrors.aliyun.com * epel: mirrors.aliyun.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com base | 3.7 kB 00:00 epel | 4.3 kB 00:00 epel/primary_db | 5.9 MB 00:05 extras | 3.4 kB 00:00 updates | 3.4 kB 00:00 ======================================================================================================== N/S Matched: jpegoptim ======================================================================================================== jpegoptim.x86_64 : Utility to optimize JPEG files Name and summary matches only, use "search all" for everything.