리눅스 centos 5.8에서 7로 업그레이드 하고자하는데요 다운이 안되고 설치가 안되네요~~

리눅스 centos 5.8에서 7로 업그레이드 하고자하는데요 다운이 안되고 설치가 안되네요~~


[root@xfindcokr upgrade]# wget  http://dev.centos.org/centos/6/upg/x86_64/Packages/preupgrade-assistant-1.0.2-33.el6.x86_64.rpm
--2015-08-24 12:53:08--  http://dev.centos.org/centos/6/upg/x86_64/Packages/preupgrade-assistant-1.0.2-33.el6.x86_64.rpm
Resolving dev.centos.org... 204.15.73.242
Connecting to dev.centos.org|204.15.73.242|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2015-08-24 12:53:09 ERROR 404: Not Found.

[root@xfindcokr upgrade]# wget http://dev.centos.org/centos/6/upg/x86_64/Packages/preupgrade-assistant-contents-0.5.13-1.el6.noarch.rpm
--2015-08-24 12:53:21--  http://dev.centos.org/centos/6/upg/x86_64/Packages/preupgrade-assistant-contents-0.5.13-1.el6.noarch.rpm
Resolving dev.centos.org... 204.15.73.242
Connecting to dev.centos.org|204.15.73.242|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2015-08-24 12:53:22 ERROR 404: Not Found.

[root@xfindcokr upgrade]# os
-bash: os: command not found
[root@xfindcokr upgrade]# os -version
-bash: os: command not found
[root@xfindcokr upgrade]# rpm -qa *-release
rpmforge-release-0.5.2-2.el5.rf
centos-release-5-8.el5.centos
[root@xfindcokr upgrade]#
[root@xfindcokr upgrade]# preupg
-bash: preupg: command not found
[root@xfindcokr upgrade]# yum localinstall redhat-upgrade-tool-0.7.22-1.el6.noarch.rpm python-rhsm-1.9.7-1.el6.x86_64.rpm
Loaded plugins: fastestmirror
Setting up Local Package Process
Cannot open file: redhat-upgrade-tool-0.7.22-1.el6.noarch.rpm. Skipping.
Cannot open file: python-rhsm-1.9.7-1.el6.x86_64.rpm. Skipping.
Nothing to do
[root@xfindcokr upgrade]#