关于在CentOS6下，安装OpenStack软件包的问题及解决。
安装openstack icehouse源：
# yum install yum-plugin-priorities -y
# yum install Fedorapeople.org/repos/openstack/openstack-icehouse/rdo-release-icehouse-4.noarch.rpm -y
安装openstack软包：
# yum install openstack-nova-api
rpm报错如下：
---> Package python-oslo-messaging.noarch 0:1.3.0.2-4.el6 will be installed
--> Processing Dependency: python-stevedore for package: python-oslo-messaging-1.3.0.2-4.el6.noarch
--> Processing Dependency: python-iso8601 for package: python-oslo-messaging-1.3.0.2-4.el6.noarch
---> Package python-routes.noarch 0:1.13-2.el6 will be installed
--> Processing Dependency: python-repoze-lru for package: python-routes-1.13-2.el6.noarch
--> Finished Dependency Resolution
Error: Package: python-kombu-2.5.16-3.el6.noarch (openstack-icehouse)
Requires: python-importlib
Error: Package: python-neutronclient-2.3.4-4.el6.noarch (openstack-icehouse)
Requires: python-cliff >= 1.0
Error: Package: python-oslo-messaging-1.3.0.2-4.el6.noarch (openstack-icehouse)
Requires: python-iso8601
Error: Package: python-kombu-2.5.16-3.el6.noarch (openstack-icehouse)
Requires: python-anyjson
Error: Package: python-oslo-messaging-1.3.0.2-4.el6.noarch (openstack-icehouse)
Requires: python-stevedore
Error: Package: python-nova-2014.1.3-3.el6.noarch (openstack-icehouse)
Requires: python-stevedore
Error: Package: 1:python-novaclient-2.17.0-2.el6.noarch (openstack-icehouse)
Requires: python-iso8601
Error: Package: python-kombu-2.5.16-3.el6.noarch (openstack-icehouse)
Requires: python-amqp
Error: Package: 1:python-keystoneclient-0.9.0-1.el6.noarch (openstack-icehouse)
Requires: python-keyring
Error: Package: 1:python-novaclient-2.17.0-2.el6.noarch (openstack-icehouse)
Requires: python-keyring
Error: Package: python-nova-2014.1.3-3.el6.noarch (openstack-icehouse)
Requires: python-anyjson
Error: Package: 1:python-keystoneclient-0.9.0-1.el6.noarch (openstack-icehouse)
Requires: python-iso8601 >= 0.1.4
Error: Package: python-nova-2014.1.3-3.el6.noarch (openstack-icehouse)
Requires: python-iso8601
Error: Package: 1:python-glanceclient-0.12.0-1.el6.noarch (openstack-icehouse)
Requires: python-httplib2
Error: Package: python-neutronclient-2.3.4-4.el6.noarch (openstack-icehouse)
Requires: python-httplib2 >= 0.7.5
Error: Package: python-routes-1.13-2.el6.noarch (openstack-icehouse)
Requires: python-repoze-lru
Error: Package: python-neutronclient-2.3.4-4.el6.noarch (openstack-icehouse)
Requires: pyparsing
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
此时，只要由于没有添加epel软件源，导致软件仓库的软包不匹配导致。
解决方法：
# yum install -y
再次安装nova相关软包即可成功。
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