[root@localhost ~]# yum install httpd

Loaded plugins: rhnplugin, security This system is not registered with RHN. RHN support will be disabled. Setting up Install Process No package httpd available. Nothing to do 解决方案：

1.卸载redhat自带的yum组件

[root@localhost ~]# rpm -qa|grep yum|xargs rpm -e --nodeps

2.安装centos的yum包

[root@localhost ~]# wget  

[root@localhost ~]# wget   [root@localhost ~]# wget   [root@localhost ~]# rpm -ivh *.rpm warning: yum-3.2.22-37.el5.centos.noarch.rpm: Header V3 DSA signature: NOKEY, key ID e8562897 Preparing...                ########################################### [100%]    1:yum-metadata-parser    ########################################### [ 33%]    2:yum-fastestmirror      ########################################### [ 67%]    3:yum                    ########################################### [100%]

 

3. 下载更新源，并存放在系统目录中

[root@localhost ~]# wget 

[root@localhost ~]#mv CentOS_Base.repo /etc/yum.repos.d/CentOS-Base.repo

 

4.生成缓存并进行安装

[root@localhost ~]# yum makecache

[root@localhost ~]# yum install httpd