1.查看系统版本
[root@hadoopnn-01 yum.repos.d]# lsb_release -a
LSB Version:    :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID: CentOS
Description:    CentOS release 6.5 (Final)
Release:        6.5
Codename:       Final
You have mail in /var/spool/mail/root
[root@hadoopnn-01 yum.repos.d]#

2.备份/etc/yum.repos.d/CentOS-Base.repo

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

下载对应版本repo文件, 放入/etc/yum.repos.d/(操作前请做好相应备份)

运行以下命令生成缓存

yum clean all
yum makecache

yum安装xxx包时出错，提示No package xxx available.