[CentOS] Upgrade path from CentOS 7 to future versions

Tue May 10 20:34:04 UTC 2016
Alice Wonder <alice at domblogger.net>

On 05/10/2016 01:29 PM, m.roth at 5-cent.us wrote:
> Alice Wonder wrote:
>> On 05/10/2016 12:19 AM, Johnny Hughes wrote:
>>> On 05/10/2016 02:08 AM, Venkateswara Rao Dokku wrote:
>>>> I would like to know whether the valid upgrade path will be present
>>>> from CentOS 7 to future versions like we get for Ubuntu or some other
>>>> operating systems.
>>>> Right now, I am sure that we do not have proper update path in CentOS
>>>> to move from one version to another.
>> I tend to keep all server content in /srv and all user content in /home
>> Upgrading from one major version to another then is pretty simple - but
>> not on the same machine.
>> I do a fresh install of the new version in a new vm, make sure all the
>> services are in place, and all the user and group ids match.
> <snip>
> I had an article published in the late, lamented SysAdmin magazine about
> 10 years ago, where I recommended having a three of spare partitions,
> doing an install using those  for /, /usr and /boot - though now you could
> get away with / and /boot. Then, if you had show-stopper issues, you could
> always boot back via the old partitions.
> Where I work, I don't think we have a handful of VMs... because in a lot
> of cases, we need every bloody CPU cycle. For example, we have an SGI
> UV2000, a small, true supercomputer, 512 cores, 2TB RAM...and I see top
> telling me that one of my users's multithreaded parallel job has a load of
> it of 467 (and no, I'm not misplacing the decimal point....)

Ah - yes, different perspective I suppose. Vast majority of servers I 
manage are VMs purchased for a monthly fee from a service provider like 
linode. If you run the physical hardware yourself that is a completely 
different set of circumstances, point taken.