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  CentOS 6.5 upgrade to CentOS 7
  Add Date : 2016-06-10      
  CentOS7 has released previously always wanted in the above test, has no chance, this can finally feel the CentOS7. CentOS6.5 been using for some time, but because it is still stuck in kernel version 2.6.32, so I decided to upgrade to CentOS7.

Incidentally interject, before upgrading a kernel, upgrade the kernel to the latest 3.15.

After the upgrade, the disk space is not a sudden, when you check the log file is actually found messages written 81G.

81G ah, then delete this file, restart, found that the log records the following information:

18: 37: 43,729 ERR kernel: DMAR: [DMA Readdevice [0d: 00.0]

18: 37: 43,730 ERR kernel: DMAR: [fault readevice [0d: 00.0] fault addr fffff000

After Google about it, because open the CPU virtualization support, the kernel needs to close

intel_iommu = off

But because I do not know if there will be other problems 3.15 kernel, so the exchange or 2.6.32.

Pull so much here that is entered

Reference to the online article: http: //seven.centos.org/2014/07/testing-centos-6-to-centos-7-upgrades-via-centos-testing-repo/

The main steps:

1. Add the repo file:


name = CentOS- $ releasever - Upgrade Tool
baseurl = http: //dev.centos.org/centos/6/upg/x86_64/
gpgcheck = 1
enabled = 1
gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-CentOS-6

2. Install the Upgrade Kit

yum install RedHat-upgrade-tool preupgrade-assistant-contents

3. Review the upgrade directory available

preupg -l

If the result is CentOS6_7, continue:

preupg -s CentOS6_7

At this time, the upgraded system will analyze the potential danger. The danger of having a hierarchical, I can refer to reference specific articles.

4. Upgrade System

centos-upgrade-tool-cli --network 7 --instrepo = http: //mirror.centos.org/centos/7/os/x86_64/

Here, if prompted: dangerous cause can not be upgraded directly force an upgrade:

centos-upgrade-tool-cli -f --network 7 --instrepo = http: //mirror.centos.org/centos/7/os/x86_64/

The upgrade process, because CentOS7 depot GPG KEY interrupted, execute:

rpm --import http://mirror.centos.org/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7

Then proceed to system upgrade command.

After the upgrade package download is complete, you need to restart, and then configure a new package, then only a cup of coffee and so on.

After the upgrade, can not enter the graphical interface, the interface can only enter the character, I do not know because the gnome desktop upgrade to 3.0 lead.
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