前面安装信息，太多，省略总计：113 M
Is this ok [y/d/N]: y
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
Running transaction check
Running transaction test
Exiting on user cancel
Error:yum install failed
在网上查了一下运行如下命令
yum provides ‘*/applydeltarpm‘
yum install deltarpm
centos7在upgrade的时候显示：Delta RPMs disabled because /usr/bin/applydeltarpm not installed
原文：https://www.cnblogs.com/awakenedy/p/9072259.html