在我的 centOS 7 上运行 yum update 时遇到了错误，命令无法更新系统！
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| # yum update
Loaded plugins: fastestmirror
Determining fastest mirrors
* base: centos.gbeservers.com
* epel: linux.mirrors.es.net
* extras: linux.mirrors.es.net
* ius: hkg.mirror.rackspace.com
* updates: mirror.atlantic.net
File "/usr/libexec/urlgrabber-ext-down", line 28
except OSError, e:
^
SyntaxError: invalid syntax
File "/usr/libexec/urlgrabber-ext-down", line 28
except OSError, e:
^
SyntaxError: invalid syntax
File "/usr/libexec/urlgrabber-ext-down", line 28
except OSError, e:
^
SyntaxError: invalid syntax
File "/usr/libexec/urlgrabber-ext-down", line 28
except OSError, e:
^
SyntaxError: invalid syntax
File "/usr/libexec/urlgrabber-ext-down", line 28
except OSError, e:
^
SyntaxError: invalid syntax
Exiting on user cancel
|
看起来系统有点问题。查了一下，发现根本原因是 python 版本不匹配。‘yum’ 命令需要 /usr/bin/python 这个符号链接指向 python2.7，而我之前改成了 python3.6。
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| # head /usr/bin/yum
#!/usr/bin/python
import sys
try:
import yum
except ImportError:
print >> sys.stderr, """
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
%s
# ll /usr/bin/python*
lrwxrwxrwx. 1 root root 9 Jul 27 2017 python -> python3.6
lrwxrwxrwx. 1 root root 9 Jul 26 2017 python2 -> python2.7
-rwxr-xr-x. 1 root root 7136 Nov 6 2016 python2.7
-rwxr-xr-x. 2 root root 11312 Apr 7 2017 python3.6
-rwxr-xr-x. 2 root root 11312 Apr 7 2017 python3.6m
|
解决方法是把 /usr/bin/yum 的第一行改成 python2。