我已经习惯了 CentOS 5 上的 Yum 每隔一周就会崩溃一次，但到目前为止，我总是能够通过简单地运行以下命令来解决问题：
yum clean all
然后就可以正常更新了。
今天无法使用。我谷歌搜索了很多，另一个常见的建议是禁用 fastmirror，我也试过了，但仍然无济于事。这是我收到的错误：
# yum update
addons | 951 B 00:00
addons/primary | 204 B 00:00
base | 2.1 kB 00:00
base/primary_db | 2.2 MB 00:00
extras | 2.1 kB 00:00
extras/primary_db | 244 kB 00:00
spacewalk-client-tools | 1.9 kB 00:00
spacewalk-client-tools/primary_db | 15 kB 00:00
updates | 1.9 kB 00:00
updates/primary_db | 603 kB 00:00
http://ftp.heanet.ie/pub/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.as29550.net/mirror.centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirrors.melbourne.co.uk/sites/ftp.centos.org/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.ellogroup.com/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.netrino.co.uk/mirror.centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirrors.coreix.net/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.krystal.co.uk/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirrors.ukfast.co.uk/sites/ftp.centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://anorien.csc.warwick.ac.uk/mirrors/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.ox.ac.uk/sites/mirror.centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.bytemark.co.uk/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://ftp.nluug.nl/ftp/pub/os/Linux/distr/CentOS/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.denit.net/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.oxilion.nl/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://ftp.tudelft.nl/centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.widexs.nl/ftp/pub/os/Linux/distr/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.nl.leaseweb.net/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirrors.supportex.net/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://centos.mirror.evertje.net/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://nl.mirror.eurid.eu/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://ftp.heanet.ie/pub/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.as29550.net/mirror.centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirrors.melbourne.co.uk/sites/ftp.centos.org/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.ellogroup.com/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.netrino.co.uk/mirror.centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirrors.coreix.net/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.krystal.co.uk/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirrors.ukfast.co.uk/sites/ftp.centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://anorien.csc.warwick.ac.uk/mirrors/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.ox.ac.uk/sites/mirror.centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.bytemark.co.uk/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://ftp.nluug.nl/ftp/pub/os/Linux/distr/CentOS/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.denit.net/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.oxilion.nl/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://ftp.tudelft.nl/centos.org/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.widexs.nl/ftp/pub/os/Linux/distr/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirror.nl.leaseweb.net/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://mirrors.supportex.net/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://centos.mirror.evertje.net/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
updates/primary_db | 603 kB 00:00
http://nl.mirror.eurid.eu/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
Error: failure: repodata/primary.sqlite.bz2 from updates: [Errno 256] No more mirrors to try.
#
是否可能每个正在尝试的 yum 镜像都有一个失效的 sqlite 包？有没有办法告诉 yum 忽略 sqlite 并只更新其余的？我尝试了 --skip-broken，但它仍然出错并出现相同的错误。
CentOS 最近太烂了 :(
巴特。
答案1
我检查了一下http://nl.mirror.eurid.eu/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2，镜子看起来没问题。
为了检查，我手动拉下了该文件：
wget http://nl.mirror.eurid.eu/centos/5.6/updates/x86_64/repodata/primary.sqlite.bz2
在其上运行 sha1sum：
$ sha1sum primary.sqlite.bz2
0c3f80f4063c9e64c000c5e6f1e5bda0a0623822 primary.sqlite.bz2
$ bzip2 -d primary.sqlite.bz2
$ sha1sum primary.sqlite
adda574a8d795705b80d6c2003947c1ae2797f5f primary.sqlite
并根据列出的值检查这些值http://nl.mirror.eurid.eu/centos/5.6/updates/x86_64/repodata/repomd.xml
<data type="primary_db"><location href="repodata/primary.sqlite.bz2"/>
<checksum type="sha">0c3f80f4063c9e64c000c5e6f1e5bda0a0623822</checksum>
<timestamp>1307575563</timestamp>
<open-checksum type="sha">adda574a8d795705b80d6c2003947c1ae2797f5f</open-checksum>
<database_version>10</database_version>
</data>
尝试并以相同的方式yum clean all检查文件。/var/cache/yum/...
答案2
然后尝试一下 yum.conf 中的 http_caching=none
参考：http://plone.lucidsolutions.co.nz/linux/rpm/yum-metadata-file-does-not-match-checksum
答案3
看来简单的答案就是等待一天然后再试一次。
由于我这边从昨天到现在没有任何变化，所以 CentOS 人员一定已经修复了他们那边的某种错误。