CentOS下升级系统 yum update命令 自己配置更新源

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我在CentOS系统下用yum update命令不能更新,提示: Cannot retrieve repository metadata (repomd.xml) for repository: update. Please verify its path and try again 这个错误。在网上查了下需要自己配置更新源,请问如何配置?最好详细点,附带更新源.谢谢.

参考技术A ps**************中国科技大学(还可以)***************

[教育网源]
上海交通大学:http://ftp.sjtu.edu.cn/centos/
清华大学:http://mirror.lib.tsinghua.edu.cn/centos/
中国科技大学:http://centos.ustc.edu.cn/centos/ (推荐,比较快)

[电信网源]
上海电信:http://mirrors.shlug.org/centos/
山东电信:http://mirrors.ta139.com/centos/
福建电信:http://mirror.be10.com/centos/

1.以root用户进入CentOS系统。
[root@xuxy ~]# cd /etc/yum.repos.d
2.备份repo
[root@xuxy yum.repos.d]# mv CentOS-Base.repo CentOS-Base.repo.bak
3.建立新的CentOS-Base.repo文件:(以CentOS 5.2为例)
[root@xuxy yum.repos.d]#vi CentOS-Base.repo
内容如下(以中国科技大学的yum源为例):
# CentOS-Base.repo
#
# This file uses a new mirrorlist system developed by Lance Davis for CentOS.
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os
baseurl=http://centos.ustc.edu.cn/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

#released updates
[updates]
name=CentOS-$releasever - Updates
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=http://centos.ustc.edu.cn/centos/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons
baseurl=http://centos.ustc.edu.cn/centos/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras
baseurl=http://centos.ustc.edu.cn/centos/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus
baseurl=http://centos.ustc.edu.cn/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

(保存并退出:wq)

现在可以yum了。^_^本回答被提问者采纳

Linux升级命令yum upgrade和yum update的区别

Linux升级命令有两个分别是yum upgrade和yum update, 这个两个命令是有区别的:

yum -y update

升级所有包同时也升级软件和系统内核

yum -y upgrade

只升级所有包,不升级软件和系统内核

 

实验分别测试 yum -y upgrade和yum -y update

 
升级前

  • 系统版本:  centos5.5 

  • 内核版本:  2.6.18-194.el5     

  • 升级前做过简单配置文件修改

yum -y upgrade    升级后

  • 系统版本:    centos5.7 

  • 内核版本:  2.6.18-194.el5

yum -y update    升级后

  • 系统版本:    centos5.7

  • 内核版本:    2.6.18-238.el5



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