linux -This system is not registered with RHN.

[root@localhost ~]# yum install net-snmp
Loaded plugins: rhnplugin, security
This system is not registered with RHN.
RHN support will be disabled.
Setting up Install Process
No package net-snmp available.

 

linux企业版为收费版本，

使用centOS源

cd /etc/yum.repos.d/
wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo
mv rhel-debuginfo.repo rhel-debuginfo.repo.bak
cp CentOS-Base.repo rhel-debuginfo.repo