centos5.5 无法使用yum解决办法

vi /etc/yum.repos.d/CentOS-Base.repo

#  

# 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://mirror.centos.org/centos/$releasever/os/$basearch/  

baseurl=http://vault.centos.org/5.11/os/$basearch/  

gpgcheck=1  

gpgkey=file:///etc/pki/rpm-gpg/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://mirror.centos.org/centos/$releasever/updates/$basearch/  

baseurl=http://vault.centos.org/5.11/updates/$basearch/  

gpgcheck=1  

gpgkey=file:///etc/pki/rpm-gpg/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://mirror.centos.org/centos/$releasever/extras/$basearch/  

baseurl=http://vault.centos.org/5.11/extras/$basearch/  

gpgcheck=1  

gpgkey=file:///etc/pki/rpm-gpg/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://mirror.centos.org/centos/$releasever/centosplus/$basearch/  

baseurl=http://vault.centos.org/5.11/centosplus/$basearch/  

gpgcheck=1  

enabled=0  

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5  

  

  

  

  

#contrib - packages by Centos Users  

[contrib]  

name=CentOS-$releasever - Contrib  

#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib  

#baseurl=http://mirror.centos.org/centos/$releasever/contrib/$basearch/  

baseurl=http://vault.centos.org/5.11/contrib/$basearch/  

gpgcheck=1  

enabled=0  

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5