在CentOS下用yum安装软件的时候最后提示如下：
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID***** 这是由于yum安装了旧版本的GPG key或者key文件不存在s造成的，解决办法如下：
第一种方式：
使用如下命令导入
rpm --import /etc/pki/rpm-gpg/RPM*
如果这种方式不行，用下面的方式：
#vim /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL
使用上门的命令打开文件，并把下面的代码粘贴到文件中。
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.2.6 (GNU/Linux)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=MMNL
-----END PGP PUBLIC KEY BLOCK-----
