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[NOAAPORT #FHN-627883]: mistral home file system full

Hi Yixin,

re: previous reply about upgrading from CentOS/RHEL 6 to 8

re:
> I did not receive your reply about it.

I couldn't fined my reply either.  I just have composed the email and
then either not sent it or it's send failed for some reason.

re:
> Would you mind sharing with me about upgrading to RHEL 8 from 6 without
> interrupting the services? Is it difficult? How long will it take? Any
> suggestions/scripts/advice? I have not tried it before.

What our system's administrator has been doing on the machines he has
upgraded so far is install a snapshot CentOS 8 system in place of 
a CentOS 6 system.  He has not been doing 'yum update' (or is it
'yum upgrade'?) although I think that this route is possible.  I think
his approach so far is to avoid problems that eventually creep in 
after doing years of 'yum update's.

I'll ask Mike (our system administrator) if he could outline exactly
what he has done and pass what he says along to you.  I think, however,
that what he will tell me is that he:

- created a CentOS 8 instance

- installed packages needed for the applications we run on the machines
  he has been upgrading so far

  I am referring to compilers, needed libraries, etc. for things like the
  LDM

- tested the new instance on a machine that is used just for testing

- and us logon and install, configure and run packages like the LDM

- made a snapshot of the instance

- used the snapshot as the image to be installed on the machines he
  has been upgrading

We have a number of machines that participate in our IDD relay clusters
and NOAAPort ingest machines that all look pretty much the same, so this
approach has worked well for all of the machines upgraded so far.

Again, I'll ask Mike if he can give a bulleted list of what he has been
doing.

Another option might be for us to provide you with the snapshot that
we have been using and then provide the instructions for installing
it.  This would not address packages you run that we don't (for instance
there are things running on mistral that we don't run here), so those
packages would need to be reinstalled after the upgrade.

Cheers,

Tom
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Ticket Details
===================
Ticket ID: FHN-627883
Department: Support NOAAPORT
Priority: High
Status: Open
===================
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