[CentOS] Centos 6.3 - which repos to use?
bry8star at yahoo.com
Mon Jan 28 07:40:25 UTC 2013
Thank you very much, Johnny Hughes, Nikolaos Milas, (and others),
for nice explanation & example.
If ALL new apps/libs starts to change their API without backward
compatibility, then, definitely updating/upgrading core/base apps
would cause domino effect, like you have pointed out. Various apps
and libs are inter-dependent & inter-connected with each others.
But do all ALL apps, or, libs do really change ALL of their API set ?
My understanding is, some new APIs are added for new features, and
older same API gets more refined, and/or newer query or response
parameters are added behind the old existing query/response.
Do not developers (when coding for newer version), anticipate ? ...
that their app/lib will and may try to communicate with another
older or another advanced (with extra query fields) app/lib, so
based on that it need to provide answer (by adding extra new
response/parameters after the older API standard/parameters) or take
I'm sure smart developers do really able to and do really code, so
that their app/lib does not fail to receive & answer when
interacting with an older app/lib or a newer app/lib.
If they(developers) purposefully does not honor backward
compatibility handling in their app/lib, that is kind of like,
forcing people to buy new computer/hardware for new Windows8.
Why apps/libs are getting bigger in src or in their binary size ?
with what ! ?
-- Bright Star.
Received from Nikolaos Milas, on 2013-01-27 4:56 PM:
> On 27/1/2013 5:11 μμ, Johnny Hughes wrote:
>> So upgrading one package can cause a domino effect that means
>> you have either broken a bunch of packages or you have to
>> rebuild a bunch of packages.
> That is why you should *only* upgrade what is VITAL for your
> application(s), and in a carefully planned manner, as Johnny
> Building on the example I gave earlier, OpenLDAP Server, which IS
> important to be current in production due to critical bug (not
> only security) fixes, can be safely upgraded using LTB project
> RPMs (http://ltb-project.org/wiki/) which allows a current
> version WITHOUT affecting the rest of the system (by using
> alternate paths to install libs, executables etc.).
> Any other Servers in need for a current version can be safely
> upgraded through a careful approach to make sure they don't break
> other things.
> So, get to know your OS, your apps, your (S)RPMs; then plan, test
> on a non-production system, then plan deployment in production.
> For example, we *only* upgrade other critical apps like Postfix,
> Dovecot etc. when running as enterprise servers. There is no
> other option here; for example, Postfix as available in
> RHEL/CentOS 5, is no more supported by the Postfix developer. We
> have to build our own RPMs based on our particular requirements.
> We enjoy the stability of CentOS because it allows us to only
> upgrade what is vital. We don't care about Gnome and other
> modernization(s). Our CentOS 5 enterprise servers do not even
> have Gnome installed.
> mailing list CentOS at centos.org
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