CentOS6.5升级到CentOS7

RedHat提供了一个redhat-upgrade-tool的升级工具；
[1]配置软件源

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# vim /etc/yum.repos.d/upgrade.repo
[upgrade]
name=upgrade
baseurl=http://dev.centos.org/centos/6/upg/x86_64/
enable=1
gpgcheck=0

[2]安装软件工具
yum -y install preupgrade-assistant-contents redhat-upgrade-tool preupgrade-assistant

[3]升级前检查潜在问题
# preupg
Preupg tool doesn't do the actual upgrade.
Please ensure you have backed up your system and/or data in the event of a failed upgrade
that would require a full re-install of the system from installation media.Do you want to continue? y/n
y
Gathering logs used by preupgrade assistant:
All installed packages : 01/10 ...finished (time 00:00s)
All changed files      : 02/10 ...finished (time 00:40s)
Changed config files  : 03/10 ...finished (time 00:00s)
All users              : 04/10 ...finished (time 00:00s)
All groups            : 05/10 ...finished (time 00:00s)
Service statuses      : 06/10 ...finished (time 00:00s)
All installed files    : 07/10 ...finished (time 00:01s)
All local files        : 08/10 ...finished (time 00:03s)
All executable files  : 09/10 ...finished (time 00:00s)
RedHat signed packages : 10/10 ...finished (time 00:00s)
Assessment of the system, running checks / SCE scripts:
001/100 ...done    (Configuration Files to Review)
002/100 ...done    (File Lists for Manual Migration)
003/100 ...done    (Bacula Backup Software)
004/100 ...done    (MySQL configuration)
005/100 ...done    (Migration of the MySQL data stack)
006/100 ...done    (General changes in default MySQL implementation)
007/100 ...done    (PostgreSQL upgrade content)
Assessment finished (time 00:00s)
Result table with checks and their results for main contents:
------------------------------------------------------------------------------------------
|System kickstart                                                        |notapplicable  |
|YUM                                                                    |notapplicable  |
|Check for usage of dangerous range of UID/GIDs                          |notapplicable  |
|Incorrect usage of reserved UID/GIDs                                    |notapplicable  |
|NIS ypbind config files back-up                                        |notapplicable  |
|NIS Makefile back-up                                                    |notapplicable  |
|NIS server maps check                                                  |notapplicable  |
|NIS server MAXUID and MAXGID limits check                              |notapplicable  |
|NIS server config file back-up                                          |notapplicable  |
------------------------------------------------------------------------------------------
Tarball with results is stored here /root/preupgrade-results/preupg_results-140716022514.tar.gz .
The latest assessment is stored in directory /root/preupgrade .
Upload results to UI by command:
e.g. preupg -u http://127.0.0.1:8099/submit/ -r /root/preupgrade-results/preupg_results-*.tar.gz .

[4]开始升级
# rpm --import http://centos.excellmedia.net/7.0.1406/os/x86_64/RPM-GPG-KEY-CentOS-7

正常的运行以上命令可以升级完成；
# redhat-upgrade-tool --network 7.0 --instrepo http://centos.excellmedia.net/7.0.1406/os/x86_64/

这强制的就显得有点不友好了，生产环境慎用；
更新到这一步：
setting up repos...
.treeinfo                                                                                                | 1.1 kB    00:00
getting boot images...
vmlinuz-redhat-upgrade-tool                                                                              | 4.7 MB    01:38
initramfs-redhat-upgrade-tool.img                                                                        |  32 MB    14:45
setting up update...
finding updates 100% [=====================================================================================================]
(1/272): acl-2.2.51-12.el7.x86_64.rpm                                                                    |  81 kB    00:00
(2/272): attr-2.4.46-12.el7.x86_64.rpm                                                                  |  66 kB    00:00
(3/272): audit-2.3.3-4.el7.x86_64.rpm                                                                    | 223 kB    00:01
(4/272): audit-libs-2.3.3-4.el7.x86_64.rpm                                                              |  77 kB    00:00
(5/272): authconfig-6.2.8-8.el7.x86_64.rpm                                                              | 399 kB    00:08
(6/272): basesystem-10.0-7.el7.centos.noarch.rpm                                                        | 5.0 kB    00:00
(7/272): bash-4.2.45-5.el7.x86_64.rpm                                                                    | 1.0 MB    00:17
(270/272): yum-plugin-fastestmirror-1.1.31-24.el7.noarch.rpm                                            |  28 kB    00:03
(271/272): zlib-1.2.7-13.el7.x86_64.rpm                                                                  |  89 kB    00:06
(272/272): zlib-devel-1.2.7-13.el7.x86_64.rpm                                                            |  49 kB    00:01
 
setting up system for upgrade
Finished. Reboot to start upgrade.

# reboot

[5]升级完成:
# cat /etc/redhat-release 
CentOS Linux release 7.0.1406 (Core)

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