我有从亚马逊AMI部署的RHEL，而yum不知何故被破坏。 由于安装了企业软件，我必须使用AMI。 没有办法回滚到以前的状态。 这是除yum delete之外的所有yum命令的输出：
[root@ip-10-0-7-208 ~]# yum update Loaded plugins: amazon-id, rhui-lb, security Traceback (most recent call last): File "/usr/bin/yum", line 29, in ? yummain.user_main(sys.argv[1:], exit_code=True) File "/usr/share/yum-cli/yummain.py", line 309, in user_main errcode = main(args) File "/usr/share/yum-cli/yummain.py", line 178, in main result, resultmsgs = base.doCommands() File "/usr/share/yum-cli/cli.py", line 345, in doCommands self._getTs(needTsRemove) File "/usr/lib/python2.4/site-packages/yum/depsolve.py", line 101, in _getTs self._getTsInfo(remove_only) File "/usr/lib/python2.4/site-packages/yum/depsolve.py", line 112, in _getTsInfo pkgSack = self.pkgSack File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 661, in <lambda> pkgSack = property(fget=lambda self: self._getSacks(), File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 501, in _getSacks self.repos.populateSack(which=repos) File "/usr/lib/python2.4/site-packages/yum/repos.py", line 232, in populateSack self.doSetup() File "/usr/lib/python2.4/site-packages/yum/repos.py", line 79, in doSetup self.ayum.plugins.run('postreposetup') File "/usr/lib/python2.4/site-packages/yum/plugins.py", line 179, in run func(conduitcls(self, self.base, conf, **kwargs)) File "/usr/lib/yum-plugins/rhui-lb.py", line 89, in postreposetup_hook path = urlparse.urlparse(repo.mirrorlist)[2] File "/usr/lib64/python2.4/urlparse.py", line 50, in urlparse tuple = urlsplit(url, scheme, allow_fragments) File "/usr/lib64/python2.4/urlparse.py", line 89, in urlsplit i = url.find(':') AttributeError: 'NoneType' object has no attribute 'find'