echo "FROM centos:$D" >Dockerfile
echo "RUN yum install -y wget yum-utils redhat-rpm-config rpm-build gcc gcc-c++ make" >>Dockerfile
echo "RUN rpm --import http://ftp.indexdata.com/pub/yum/centos/$F/RPM-GPG-KEY-indexdata" >>Dockerfile
echo "FROM centos:$D" >Dockerfile
echo "RUN yum install -y wget yum-utils redhat-rpm-config rpm-build gcc gcc-c++ make" >>Dockerfile
echo "RUN rpm --import http://ftp.indexdata.com/pub/yum/centos/$F/RPM-GPG-KEY-indexdata" >>Dockerfile