報錯信息
在 安裝openstack T版本的時候 keystone時出錯：
Error: Package: python2-qpid-proton-0.26.0-2.el7.x86_64 (centos-openstack-train)
Requires: qpid-proton-c(x86-64) = 0.26.0-2.el7
Available: qpid-proton-c-0.14.0-2.el7.x86_64 (extras)
qpid-proton-c(x86-64) = 0.14.0-2.el7
Available: qpid-proton-c-0.26.0-2.el7.x86_64 (centos-openstack-train)
qpid-proton-c(x86-64) = 0.26.0-2.el7
Installing: qpid-proton-c-0.37.0-1.el7.x86_64 (epel)
qpid-proton-c(x86-64) = 0.37.0-1.el7
You could try using --skip-broken to work around the problem
** Found 3 pre-existing rpmdb problem(s), 'yum check' output follows:
PackageKit-1.1.10-2.el7.centos.x86_64 has missing requires of PackageKit-backend
anaconda-core-21.48.22.159-1.el7.centos.x86_64 has missing requires of yum-utils >= ('0', '1.1.11', '3')
supermin5-5.1.19-1.el7.x86_64 has missing requires of yum-utils
原因分析
如圖所示，仔細閱讀可知，現在安裝的軟件包版本和需要的軟件包版本不一致，還給出了你兩個可用的軟件包的位置，所以直接安裝即可。
解決問題
yum -y install PackageKit-backend
yum -y install yum-utils
yum -y install qpid-proton-c-0.26.0-2.el7.x86_64結果告知
yum -y install openstack-keystone