云服务器CentOS6.4 升级到7.0的步骤

靠前步：

1]配置软件源

# 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