[CentOS] Upgrade from CentOS6.6 to CentOS 7

[Digimer]

On 15/12/15 11:00 AM, Traiano Welcome wrote:
> Hi Digimer
> 
> 
> On Tue, Dec 15, 2015 at 6:54 PM, Digimer <lists at alteeve.ca> wrote:
>> On 15/12/15 10:43 AM, Traiano Welcome wrote:
>>> On Tue, Dec 15, 2015 at 6:36 PM, Digimer <lists at alteeve.ca> wrote:
>>>> On 15/12/15 10:17 AM, Traiano Welcome wrote:
>>>>> Hi All
>>>>>
>>>>> Is it possible to upgrade from CentOS 6.7 to CentOS 7?
>>>>>
>>>>> I  see there is some attempt at an upgrade tool available, but it's
>>>>> apparently broken:
>>>>>
>>>>> https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool
>>>>>
>>>>> Would anyone be able to recommend a manual upgrade procedure to
>>>>> upgrade a minimal CentOS 6.7 system to one or other version of CentOS
>>>>> 7?
>>>>>
>>>>> Many thanks in advance,
>>>>> Traiano
>>>>
>>>> Given how radically the OS changed, I would strongly advice against it.
>>>> The move from sysvinit to systemd alone is enough to recommend against
>>>> an upgrade.
>>>
>>>
>>> So it's not possible under any circumstances?
>>
>> I suppose anything is possible with enough time and effort, but I
>> strongly recommend against it.
>>
>> CentOS is a server OS and as such should be used in a manner that
>> provides maximum reliability. An upgrade in general introduces avoidable
>> risk. An upgrade from 6 to 7 would induce far more risk than usual.
>>
>> Much safe to setup centos 7 fresh and migrate services over in a
>> controlled fashion.
> 
> I'm aware and appreciative of these risks. However, given the unique
> situation I need to address, it's worth spending the time needed to
> attempt this.
> If some tweaking, and a moderate amount of head-wall contact is
> required, that's ok.
> 
> If there is any method that provides a reasonable approximation of
> success, I'd be thankful if you could point me to it.

I don't know what you should do, as I have never and would never attempt
this. Given that there are (so far failed) attempts to write an upgrade
program, I am not too confident at the chances of success.

Honestly, just stay on CentOS 6. It will be supported until 2020.

-- 
Digimer
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