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导入ownCloud秘钥
rpm --import https://download.owncloud.org/download/repositories/production/CentOS_7/repodata/repomd.xml.key
下载文件
wget http://download.owncloud.org/download/repositories/production/CentOS_7/ce:stable.repo -O /etc/yum.repos.d/ce:stable.repo
清理缓存
yum clean all
在线安装
yum install owncloud-files
其他系统参考：
https://download.owncloud.org/download/repositories/stable/owncloud/index.html