yum 报错与解决方法

1.错误：http://apt.sw.be/redhat/el5/en/i386/dag/repodata/filelists.xml.gz : [Errno -1] Metadata file does not match

checksum Trying other mirror.
Error: failure: repodata/filelist.xml.gz from dag: [Errno 256] No more mirrors to try.

解决：yum clean all

2.在使用yum 进行 install 时,错误
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY,key ID 1ac70ce6
导致安装不能进行。

解决：
[root@localhost CentOS]# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
[root@localhost CentOS]# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-beta
即导入密钥。