解决This system is not registered with RHN

故事缘由：
[root@oggs]# rpm -ivh unixODBC-devel-2.2.11-10.el5.i386.rpm 
warning: unixODBC-devel-2.2.11-10.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID e8562897
error: Failed dependencies:
        libboundparam.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libesoobS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libgtrtst.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libmimerS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libnn.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libodbccr.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libodbcdrvcfg1S.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libodbcdrvcfg2S.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libodbcinst.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libodbcminiS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libodbcnnS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libodbctxtS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        liboplodbcS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        liboraodbcS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libsapdbS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libtdsS.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        libtemplate.so.1 is needed by unixODBC-devel-2.2.11-10.el5.i386
        unixODBC = 2.2.11-10.el5 is needed by unixODBC-devel-2.2.11-10.el5.i386
        unixODBC-libs = 2.2.11-10.el5 is needed by unixODBC-devel-2.2.11-10.el5.i386

装单机ORACLE11G遇到 上面问题，又不能每个依赖包找出来，只好使用Yum

[root@oggs]#yum -y install   unixODBC-devel

Loaded plugins: rhnplugin, security
This system is not registered with ULN.
ULN support will be disabled.
Setting up Install Process
No package unixODBC-devel available.
Nothing to do

真是他妈的坎坷。。。。。

解决办法(下载yum)：

[root@oggs ~]# cd /etc/yum.repos.d/
[root@oggs yum.repos.d]# ll
total 0
[root@oggs yum.repos.d]# wget http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo
--2016-02-18 15:17:15--  http://docs.linuxtone.org/soft/lemp/CentOS-Base.repo
Resolving docs.linuxtone.org... 203.74.150.88
Connecting to docs.linuxtone.org|203.74.150.88|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1426 (1.4K) [application/octet-stream]
Saving to: `CentOS-Base.repo'


100%[======================================>] 1,426       --.-K/s   in 0s      


2016-02-18 15:17:15 (20.4 MB/s) - `CentOS-Base.repo' saved [1426/1426]


[root@oggs yum.repos.d]# ll
total 4
-rw-r--r-- 1 root root 1426 May 24  2009 CentOS-Base.repo
[root@oggs yum.repos.d]# yum install unixODBC-devel
Loaded plugins: rhnplugin, security
This system is not registered with ULN.
ULN support will be disabled.
addons                                                   | 1.9 kB     00:00     
addons/primary_db                                        | 1.1 kB     00:00     
base                                                     | 1.1 kB     00:00     
base/primary                                             | 1.3 MB     00:11     
base                                                                  3667/3667
extras                                                   | 2.1 kB     00:00     
extras/primary_db                                        | 173 kB     00:01     
update                                                   | 1.9 kB     00:00     
update/primary_db                                        | 650 kB     00:02     
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package unixODBC-devel.i386 0:2.2.11-10.el5 set to be updated
--> Processing Dependency: unixODBC = 2.2.11-10.el5 for package: unixODBC-devel
--> Processing Dependency: unixODBC-libs = 2.2.11-10.el5 for package: unixODBC-devel
--> Processing Dependency: libtemplate.so.1 for package: unixODBC-devel
--> Processing Dependency: libesoobS.so.1 for package: unixODBC-devel
--> Processing Dependency: libodbcinst.so.1 for package: unixODBC-devel
--> Processing Dependency: libtdsS.so.1 for package: unixODBC-devel
--> Processing Dependency: libodbccr.so.1 for package: unixODBC-devel
--> Processing Dependency: libodbcdrvcfg2S.so.1 for package: unixODBC-devel
--> Processing Dependency: libgtrtst.so.1 for package: unixODBC-devel
--> Processing Dependency: libsapdbS.so.1 for package: unixODBC-devel
--> Processing Dependency: libnn.so.1 for package: unixODBC-devel
--> Processing Dependency: libodbcnnS.so.1 for package: unixODBC-devel
--> Processing Dependency: libodbctxtS.so.1 for package: unixODBC-devel
--> Processing Dependency: liboplodbcS.so.1 for package: unixODBC-devel
--> Processing Dependency: libodbcdrvcfg1S.so.1 for package: unixODBC-devel
--> Processing Dependency: libboundparam.so.1 for package: unixODBC-devel
--> Processing Dependency: libmimerS.so.1 for package: unixODBC-devel
--> Processing Dependency: libodbcminiS.so.1 for package: unixODBC-devel
--> Processing Dependency: liboraodbcS.so.1 for package: unixODBC-devel
---> Package unixODBC-devel.x86_64 0:2.2.11-10.el5 set to be updated
--> Running transaction check
---> Package unixODBC.x86_64 0:2.2.11-10.el5 set to be updated
---> Package unixODBC-libs.i386 0:2.2.11-10.el5 set to be updated
---> Package unixODBC-libs.x86_64 0:2.2.11-10.el5 set to be updated
--> Finished Dependency Resolution


Dependencies Resolved


================================================================================
 Package                Arch           Version               Repository    Size
================================================================================
Installing:
 unixODBC-devel         i386           2.2.11-10.el5         base         739 k
 unixODBC-devel         x86_64         2.2.11-10.el5         base         793 k
Installing for dependencies:
 unixODBC               x86_64         2.2.11-10.el5         base         291 k
 unixODBC-libs          i386           2.2.11-10.el5         base         551 k
 unixODBC-libs          x86_64         2.2.11-10.el5         base         554 k


Transaction Summary
================================================================================
Install       5 Package(s)
Upgrade       0 Package(s)


Total download size: 2.9 M
Is this ok [y/N]: y
Downloading Packages:
(1/5): unixODBC-2.2.11-10.el5.x86_64.rpm                 | 291 kB     00:00     
(2/5): unixODBC-libs-2.2.11-10.el5.i386.rpm              | 551 kB     00:02     
(3/5): unixODBC-libs-2.2.11-10.el5.x86_64.rpm            | 554 kB     00:02     
(4/5): unixODBC-devel-2.2.11-10.el5.i386.rpm             | 739 kB     00:11     
(5/5): unixODBC-devel-2.2.11-10.el5.x86_64.rpm           | 793 kB     00:02     
--------------------------------------------------------------------------------
Total                                           151 kB/s | 2.9 MB     00:19     
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897
base/gpgkey                                              | 1.5 kB     00:00     
Importing GPG key 0xE8562897 "CentOS-5 Key (CentOS 5 Official Signing Key) <centos-5-key@centos.org>" from http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing     : unixODBC-libs                                            1/5 
  Installing     : unixODBC                                                 2/5 
  Installing     : unixODBC-libs                                            3/5 
  Installing     : unixODBC-devel                                           4/5 
  Installing     : unixODBC-devel                                           5/5 


Installed:
  unixODBC-devel.i386 0:2.2.11-10.el5   unixODBC-devel.x86_64 0:2.2.11-10.el5  


Dependency Installed:
  unixODBC.x86_64 0:2.2.11-10.el5         unixODBC-libs.i386 0:2.2.11-10.el5   
  unixODBC-libs.x86_64 0:2.2.11-10.el5   


Complete!