On Fri, 30 Jan 2015, Yasha Karant wrote:

> On 01/30/2015 10:32 AM, Brett Viren wrote:
>> Yasha Karant <[log in to unmask]> writes:
>>
>>> For example, will a
>>> legally licensed MS Win application that does not run under
>>> Wine/CrossOver work under Docker under SL 7 the same as it would under
>>> VirtualBox with a full install of say MS Win 8.1 (soon MS Win 10)?
>> Docker containers run on Linux (the kernel) so, no, if your application
>> requires honest-to-badness MicroSoft Windows don't plan on using Docker.
>>
>>> Can one make a Docker application package on the target host (e.g., SL
>>> 7) or does one need first a full install of the (virtual) base
>> I don't know what "target" (host? guest?) means here.
>
> The application, say A, runs under environment (OS) X, not environment
> Y.  One wants A under Y.  The target is Y.  Can one build A under Y
> using the appropriate "chunks"
> from X with Docker, or does one re-build ("dockerise") A under X for
> target Y?  In the first event, one only needs to be running Y; in the
> second event, one needs to be running X to build for Y.
>>
>> A Docker image is a full OS (minus the kernel).  To start you write one
>> line in a Dockerfile like:
>>
>>    FROM fedora:20
>>
>> and do a "docker build"
>>
>> You can follow up this line with additional instructions (such as "yum
>> install ...") to further populate.
>>
>> If you have a second image that shares some portion of these
>> instructions, or as you add more instructions, any prior existing
>> "layer" is reused.
>>
>>
>> I don't find a lot of bases for SL but there are ways to add new base
>> OSes from first principles (CMS has some scripts in github) and there
>> are established ones for centos.
>>
>>
>> -Brett.
> Presumably, any application that will run under CentOS, in particular,
> CentOS 7 that is the RHEL source release for other ports, such as SL 7,
> should be able to run under SL.  My understanding is that SL 7 is not
> built from the actual RHEL 7 source that is used to build RHEL 7 that is
> licensed for fee, but from the RHEL packaged CentOS source (CentOS now
> effectively being a unit of Red Hat, a for-profit corporation) that is
> used to build CentOS 7 (that, as with SL 7, is licensed for free as a
> binary installable executable system that requires no building from
> source per se).
>
> Yasha
>

SL is built from the source that Red Hat has provided .  It is built from 
the same source that all rebuilds can build from.  There is no such thing 
as "RHEL packaged CentOS source" .

--
Connie J. Sieh
Computing Services Specialist III

Fermi National Accelerator Laboratory
630 840 8531 office

http://www.fnal.gov
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