centos7.3安裝openstack-mitaka

https://docs.openstack.org/mitaka/zh_CN/install-guide-rdo/ 按照官網安裝文檔，step by step 準備：配置ip和host、安裝chrony的NTP 1 yum install centos-release-openstack-mitaka 說明：這步用純淨環境安裝沒問題，但是之前裝過newton就該先yum remove newto

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