在 RHEL 7.4 系统上，我添加了 salt-latest 存储库，如下所示：
yum -y install https://repo.saltstack.com/yum/redhat/salt-repo-latest-2.el7.noarch.rpm
请注意，除其他事项外，这会创建以下两个 GPG 密钥文件：
/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-Salt
/etc/pki/rpm-gpg/saltstack-signing-key
为了供以后参考，请注意 CentOS 密钥的指纹以 f4a80eb5 结尾：
# gpg --quiet --with-fingerprint /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7-Salt
pub 4096R/F4A80EB5 2014-06-23 CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>
Key fingerprint = 6341 AB27 53D7 8A78 A7C2 7BB1 24C6 A8A7 F4A8 0EB5
尝试重新同步下载：
mkdir /root/foobar
reposync --gpgcheck --plugins --repoid=salt-latest --download_path=/root/foobar --newest-only --downloadcomps --delete --download-metadata
它失败并出现如下错误：
Removing babel-0.9.6-8.el7.noarch.rpm, due to missing GPG key.
Removing libyaml-0.1.4-11.el7_0.i686.rpm, due to missing GPG key.
Removing libyaml-0.1.4-11.el7_0.x86_64.rpm, due to …