Free-Abc智能Centos6.X升级到Centos7：
step 1：
[root@localhost ~]# cat /etc/yum.repos.d/upgrade.repo [upgrade] name=upgrade baseurl=http://dev.centos.org/centos/6/upg/x86_64/ enable=1 gpgcheck=0
step 2：
[root@localhost ~]# yum install preupgrade-assistant-contents redhat-upgrade-tool preupgrade-assistant
step 3:
[root@localhost ~]# preupg
step 4：
[root@localhost ~]# rpm --import http://mirrors.163.com/centos/7.0.1406/os/x86_64/RPM-GPG-KEY-CentOS-7 [root@localhost ~]# redhat-upgrade-tool --network 7.0 --instrepo http://mirrors.163.com/centos/7.0.1406/os/x86_64/ (265/266): zlib-1.2.7-13.el7.x86_64.rpm | 89 kB 00:00 (266/266): zlib-devel-1.2.7-13.el7.x86_64.rpm | 49 kB 00:00 testing upgrade transaction rpm transaction 100% [==============================================================================================================] rpm install 100% [==================================================================================================================] setting up system for upgrade Finished. Reboot to start upgrade.
升级centos7过程其实非常的简单了，这个也是linux内核系统的一个优点了，升级系统可以直接使用简单的命令完以