CentOS（Community ENTerprise Operating System）是Linux发行版之一，它是来自于Red Hat Enterprise Linux依照开放源代码规定开放的源代码所编译而成。由于出自同样的源代码，因此有些要求高度稳定性的服务器以CentOS替代商业版的Red Hat Enterprise Linux使用。两者的不同，在于CentOS并不包含封闭源代码软件.建议升级到最新版本，原文如下：

CentOS Errata and Security Advisory CESA-2010:0817
End Of Life security update for CentOS 3:
https://rhn.redhat.com/errata/RHSA-2010-0817.html

As per the upstream vendors errata support policy, updates for CentOS-3
has ended on October 31th 2010.

It is recommended that any system still running CentOS 3 should be
upgraded to a more recent version of CentOS before this date to ensure
continued security and bug fix support.

see also http://wiki.centos.org/HowTos/EOLC3

Thank you to everyone who helped make this project possible.

Tru
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Tru Huynh (mirrors, CentOS-3 i386/x86_64 Package Maintenance)
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBEFA581B