IOError：运行yum命令时不支持的XML-RPC协议

Question

当我尝试运行任何yum命令时，出现了以下信息。在这个错误发生之前，我禁用了SSL并重新启用了它。系统提示RHNS-CA-CERT已经过期，所以我删除了这个证书，并使用wget命令重新下载了它。然后我试图用yum命令更新证书，这时候问题就出现了。

以下是错误信息：

Loaded plugins: rhnplugin
Exception RuntimeError: 'maximum recursion depth exceeded in __subclasscheck__' in <type 'exceptions.AttributeError'> ignored
Traceback (most recent call last):   
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 285, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 105, in main
    base.getOptionsConfig(args)
  File "/usr/share/yum-cli/cli.py", line 228, in getOptionsConfig
    self.conf
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 891, in <lambda>
    conf = property(fget=lambda self: self._getConfig(),
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 362, in _getConfig
    self.plugins.run('init')
  File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 184, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File "/usr/share/yum-plugins/rhnplugin.py", line 118, in init_hook
    login_info = up2dateAuth.getLoginInfo(timeout=timeout)
  File "/usr/share/rhn/up2date_client/up2dateAuth.py", line 219, in getLoginInfo
    login(timeout=timeout)
  File "/usr/share/rhn/up2date_client/up2dateAuth.py", line 170, in login
    server = rhnserver.RhnServer(timeout=timeout)
  File "/usr/share/rhn/up2date_client/rhnserver.py", line 154, in __init__
    timeout=timeout)
  File "/usr/share/rhn/up2date_client/rpcServer.py", line 160, in getServer
    timeout=timeout)
  File "/usr/lib/python2.6/site-packages/rhn/rpclib.py", line 169, in __init__
    self._reset_host_handler_and_type()
  File "/usr/lib/python2.6/site-packages/rhn/rpclib.py", line 315, in _reset_host_handler_and_type
    raise IOError, "unsupported XML-RPC protocol"
IOError: unsupported XML-RPC protocol

Answer 1

好的，我猜测你是在使用RHN Classic（rhn.redhat.com）。之前有一些更新修复了这个过期的证书，这里有一篇相关的知识库文章：

系统连接到RHN时出现“证书过期或证书验证失败”的错误 https://access.redhat.com/solutions/353033

出现IOError: unsupported XML-RPC protocol的错误信息让我猜测，你在/etc/sysconfig/rhn/up2date文件中设置的serverURL可能不正确。它应该是这样的：

serverURL=https://xmlrpc.rhn.redhat.com/XMLRPC