centos 6.2 update

[root@uat-01 theme-frontend_v2]# yum -y update
...
[root@uat-01 theme-frontend_v2]# yum -y remove qpid-cpp-client   #卸载冲突包
...
(558/560): yum-plugin-fastestmirror-1.1.30-40.el6.noarch.rpm                                                                                                                            |  33 kB     00:00
(559/560): yum-utils-1.1.30-40.el6.noarch.rpm                                                                                                                                           | 113 kB     00:00
(560/560): zip-3.0-1.el6_7.1.x86_64.rpm                                                                                                                                                 | 259 kB     00:00
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                                          2.7 MB/s | 528 MB     03:17
Running rpm_check_debug
Running Transaction Test


Transaction Check Error:
  file /usr/include/FlexLexer.h from install of flex-2.5.35-9.el6.x86_64 conflicts with file from package flex-2.5.4a-41.fc6.i386
  file /usr/share/man/man1/flex.1.gz from install of flex-2.5.35-9.el6.x86_64 conflicts with file from package flex-2.5.4a-41.fc6.i386
  file /usr/share/man/man1/rdate.1.gz from install of rdate-1.4-16.el6.x86_64 conflicts with file from package rdate-1.4-8.el5.i386

Error Summary
-------------

[root@uat-01 theme-frontend_v2]#
[root@uat-01 theme-frontend_v2]# yum -y remove flex-2.5.4a-41.fc6.i386 #卸载冲突包
[root@uat-01 theme-frontend_v2]# yum -y remove rdate-1.4-8.el5.i386 #卸载冲突包
[root@uat-01 theme-frontend_v2]# yum -y update --enablerepo=remi

[root@uat-01 ~]# yum
Loaded plugins: downloadonly, fastestmirror, presto
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 298, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 115, in main
    base.getOptionsConfig(args)
  File "/usr/share/yum-cli/cli.py", line 229, in getOptionsConfig
    self.conf
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 911, in <lambda>
    conf = property(fget=lambda self: self._getConfig(),
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 335, in _getConfig
    startupconf.pluginconfpath,disabled_plugins,enabled_plugins)
  File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 564, in doPluginSetup
    plugin_types, confpath, disabled_plugins, enabled_plugins)
  File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 167, in __init__
    self.run('config')
  File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 184, in run
    func(conduitcls(self, self.base, conf, **kwargs))
  File "/usr/lib/yum-plugins/downloadonly.py", line 27, in config_hook
    default=False, help="don't update, just download")
  File "/usr/lib64/python2.6/optparse.py", line 1020, in add_option
    self._check_conflict(option)
  File "/usr/lib64/python2.6/optparse.py", line 995, in _check_conflict
    option)
optparse.OptionConflictError: option --downloadonly: conflicting option string(s): --downloadonly


解决 
$ cat /etc/yum/pluginconf.d/downloadonly.conf
[main]
enabled=0    # 将其改成0

参考： https://qiita.com/tsubasaogawa/items/cb088da03ea43a1cf4fe