docker 构建镜像报错“Delta RPMs disabled because /usr/bin/applydeltarpm not installed”
报错
制作基于基础镜像的系统Base镜像，中出现报错
[root@ubuntu1804-1 /data/dockerfile/system/centos]#docker build -t centos7-base:v1 .
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
Could not resolve host: mirrors.cloud.aliyuncs.com; Unknown error
解决方法
apt install -y deltarpm
yum clean all
yum repolist
