el5.4 x86_64 系统yum源问题相关笔记 centos5 centos6

新安装的系统，没有VIM和其它工具。

尝试安装yum install vim

提示：

mirrorlist with no valid mirrors: /var/cache/yum/addons/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: addons

解决方法：

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_backpu

新建一个，内容为：

[base]
name=CentOS-5.11 - Base
failovermethod=priority
baseurl=http://vault.centos.org/5.11/os/$basearch/
gpgcheck=1
gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

#released updates 
[updates]
name=CentOS-5.11 - Updates
failovermethod=priority
baseurl=http://vault.centos.org/5.11/updates/$basearch/
gpgcheck=1
gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

#additional packages that may be useful
[extras]
name=CentOS-5.11 - Extras
failovermethod=priority
baseurl=http://vault.centos.org/5.11/extras/$basearch/
gpgcheck=1
gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-5.11 - Plus
failovermethod=priority
baseurl=http://vault.centos.org/5.11/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

#contrib - packages by Centos Users
[contrib]
name=CentOS-5.11 - Contrib
failovermethod=priority
baseurl=http://vault.centos.org/5.11/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://vault.centos.org/RPM-GPG-KEY-CentOS-5

然后

yum clean all  && yum makecache

如果发生python之类的崩溃（通常是因为网络超时引起的），再尝试一次yum makecache即可。

之后安装VIM

yum install vim-enhanced.x86_64

如果提示 Peer cert cannot be verified or peer cert invalid

        则更改一下本地时间到最近的时间，相差不要超过24小时。不要比对面时间大。

如果提示证书不通过，则修改/etc/yum.conf中增加 sslverify=false或者将ggpcheck改为0.

如果是centos6.0的系统（32位或64位都可以）

将上面的5.11替换为6.0，  CentOS-5替换为CentOS-6