[root@oldboy /]# yum install -y ruby ruby-devel rubygems

gem install fpm
gem sources --add https://mirrors.tuna.tsinghua.edu.cn/rubygems/ --remove https://rubygems.org/
gem sources -l
gem install fpm
fpm -s dir -t rpm -n cosmo -v 8.0 1.txt
补充：如果遇到这样的报错

Need executable 'rpmbuild' to convert dir to rpm {:level=>:error}

一般是因为需要你安装rpmbuild

yum -y install rpm-build
fpm -s dir -t rpm -n cosmo -v 8.0 1.txt