[CentOS] Upgrade path from CentOS 7 to future versions

Tue May 10 20:56:06 UTC 2016
m.roth at 5-cent.us <m.roth at 5-cent.us>

Alice Wonder wrote:
> 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.

Yup. I'm 0ne of 3.5 sysadmins, and we run better than 170 servers and
workstations. (.5, because she's at another Institute the other half of
her time.)