CentOS 6 to CentOS 7

Redhat provides a Redhat-upgrade-tool upgrade tool;

[1] Configuring the software source

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

[2] Installing software tools

Yum-y Install preupgrade-assistant-contents Redhat-upgrade-tool preupgrade-assistant

[3] Check for potential issues before upgrading

# preupgpreupg tool doesn ' T do the actual upgrade. Please ensure you have backed up your system and/or data in  the event of a failed upgradethat would require a full  re-install of the system from installation media. Do you want to continue? y/nygathering 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&NBSp 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] Start the upgrade

# RPM--import http://centos.excellmedia.net/7.2.1511/os/x86_64/RPM-GPG-KEY-CentOS-7

The normal operation of the above command can be upgraded to complete;

# redhat-upgrade-tool--network 7.0--instrepo http://centos.excellmedia.net/7.2.1511/os/x86_64/

This force is a little unfriendly, production environment with caution;

Update to this step:

setting up repos....treeinfo                                                                                                     | 1.1 kB      00:00getting boot images...vmlinuz-redhat-upgrade-tool                                                                                  | 4.7 MB      01:38initramfs-redhat-upgrade-tool.img                                                                            |  32 MB      14:45setting 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 upgradefinished. reboot to start upgrade.

# reboot

[5] Upgrade complete:

# cat/etc/redhat-release CentOS Linux release 7.0.1406 (Core)

This article is from the "Siberian Wolf" blog, please make sure to keep this source http://kernal.blog.51cto.com/8136890/1532150

CentOS 6 to CentOS 7