[CentOS] OS upgrade from CentOS 6.x version.

need? no. should? probably.




if 'production' means what it does in my $job's enterprise environment,
absolutely not. we do nothing to a production environment without
testing first in a staging environment that replicates
production. updated of complicated production systems is tricky.


that said, things like development servers, hobby internet webservers
running a few blogs and stuff, things like that, I regularly do yum
update's on, but I also have backups if its at all important, so I can
revert to last night if there's a problem.

Thanks John for the quick reply. Not sure i understand your reply.






You said backups. Any backup program you suggest to back up all
configuration files and data?


Regards


Kaushal

'yum update' updates to the latest minor version (like 6.4 to 6.5), unless
you specifically don't prevent this.


Updates to the next major version (like 5.x to 6.x) are more challenging.

I tend to call this new install and not update.

On Sun, Jun 9, 2013 at 2:20 PM, Markus Falb wrote:




Also any difference between upgrade and update. its very confusing. I see
on the forums some say update and some upgrade. Please help me understand.


Regards


Kaushal.

5.x to 6.a - upgrade (never do this on a production system and its not supported)


6.x to 6.y - update


you can also do a partially update - lets say just security relevant stuff.


You need to have "yum-plugin-security" installed


$ yum install yum-plugin-security


and then compare the output of


$ yum --security update


vs.


$ yum update

No difference. Running "yum upgrade" is the same as running "yum update"
with the "--obsoletes" flag set, but for some time now, "obsoletes=1" has
been the default setting in /etc/yum.conf.