安装工具时,执行#yum install -y yum-utils时，报错
注意：是服务器连接不到网络，需要配置镜像源
打开etc目录下的配置文件
编辑Centos-Base.repo文件
将内容改为
[base] name=CentOS-$releasever - Base baseurl=https://mirrors.aliyun.com/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7 [updates] name=CentOS-$releasever - Updates baseurl=https://mirrors.aliyun.com/centos/$releasever/updates/$basearch/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7 [extras] name=CentOS-$releasever - Extras baseurl=https://mirrors.aliyun.com/centos/$releasever/extras/$basearch/ gpgcheck=1 gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7 [centosplus] name=CentOS-$releasever - Plus baseurl=https://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/ gpgcheck=1 enabled=0 gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7 ~
修改后，清除yum缓存
# yum clean all
再次执行就可以正常安装
总结