centos7.3安装openstack-mitaka

https://docs.openstack.org/mitaka/zh_CN/install-guide-rdo/ 按照官网安装文档，step by step 准备：配置ip和host、安装chrony的NTP 1 yum install centos-release-openstack-mitaka 说明：这步用纯净环境安装没问题，但是之前装过newton就该先yum remove newto

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