[lj@localhost ~]$ sudo yum install -y libdvdcss gstreamer{,1}-plugins-ugly gstreamer-plugins-bad-nonfree gstreamer1-plugins-bad-freeworld libde265 x265已加载插件：fastestmirror, langpacksLoading mirror speeds from cached hostfile* base: * extras: * updates: /centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: ; 未知的错误"正在尝试其它镜像。http://mirrors./centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.; 未知的错误"正在尝试其它镜像。/centos/7/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: ; 未知的错误"正在尝试其它镜像。/linux/centos/7/x86_64/stable/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: ; 未知的错误"正在尝试其它镜像。/centos/7/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: ; 未知的错误"正在尝试其它镜像。http://mirrors./centos/7/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.; 未知的错误"正在尝试其它镜像。/centos/7/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: ; 未知的错误"正在尝试其它镜像。/centos/7/updates/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: ; 未知的错误"正在尝试其它镜像。http://mirrors./centos/7/updates/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.; 未知的错误"正在尝试其它镜像。/centos/7/updates/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: ; 未知的错误"正在尝试其它镜像。没有可用软件包 libdvdcss。没有可用软件包 gstreamer-plugins-ugly。没有可用软件包 gstreamer1-plugins-ugly。没有可用软件包 gstreamer-plugins-bad-nonfree。没有可用软件包 gstreamer1-plugins-bad-freeworld。没有可用软件包 libde265。没有可用软件包 x265。错误：无须任何处理
解决办法：
编辑/etc/resolv.conf文件
vi /etc/resolv.confnameserver 8.8.8.8nameserver 114.114.114.114
