CentOS的yum-updatesd服务是可以自动更新系统的，只用稍微调整一个配置文件/etc/yum/yum-updatesd.conf：
[main]
# how often to check for new updates (in seconds)
run_interval = 3600# how often to allow checking on request (in seconds)
updaterefresh = 600
# how to send notifications (valid: dbus, email, syslog)
#emit_via = dbus
emit_via = email
email_from = yum-updatesd@MO01H36
email_to = caoyuwei@xxxx.com
# should we listen via dbus to give out update information/check for
# new updates
dbus_listener = yes
# automatically install updates
do_update = yes
# automatically download updates
do_download = yes
# automatically download deps of updates
do_download_deps = yes
This is the automatic update system on MO01H36.There was a problem updating the system. The following error message was reported:Failed to build transaction: Missing Dependency: /usr/lib/python2.4 is needed by package libxml2-python-2.6.26-2.1.2.7.i386 (installed)
Missing Dependency: /usr/lib/python2.4 is needed by package gamin-python-0.1.7-8.el5.i386 (installed)
If the problem persists, manual intervention may be required.
Thank You,
Your Computer
最终解决方法是：yum clean all
然后便可以 yum update了，yum-updated也会自动更新系统。
感慨一下团队的力量。这个解决办法是神仙发现的，哈，我们总是能遇到这样的惊喜！
PS: 2010-5-14
阅读CentOS 5.4发行说明的时候发现：
On this day..
- 明天又是新的一天 又寂寞又美好 - 2005
Tags: centos, yum, yum-updated