[CentOS] Upgrade path from CentOS 7 to future versions

[m.roth at 5-cent.us]

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....)

         mark