CentOS7如何手工创建自己的YUM仓库?

yum-plugin-verify.noarch               1.1.31-29.el7                   centos   

yum-plugin-versionlock.noarch          1.1.31-29.el7                   centos   

zlib-devel.x86_64                      1.2.7-13.el7                    centos   

zsh.x86_64                             5.0.2-7.el7                     centos   

zziplib.x86_64                         0.13.62-5.el7                   centos

这里的centos为[centos]里面的名字。