[Container-tools] How adb and Nulecule fit together?

[Saleem Ansari]

> Subject: Re: [Container-tools] How adb and Nulecule fit together?
> 
> Hi Saleem,


Hi Tomas!


> > 
> > Atomicapp is a reference implementation of Nulecule specification. However
> > it doesn't define how to run the app itself, so I assume it is actually
> > Atomic that will help with this task.
> > 
> > However from the project description of Atomic: "Atomic Run Tool for
> > installing/running/managing container images.", it doesn't say anything
> > specific to Atomicapp either.
> > 
> 
> Atomic is generic high-level tool for manipulating containers.
> 
> Atomic allows an image provider to specify how a container image expects
> to be run.


This definitely helps me understand Atomic better. It also makes me ask more questions :-)

 * who is "image provider" here? ( can I as a developer be considered an image provider ? )
 * does Atomic expect the containers to be described in a specific way?
 * can Atomic run any existing container image or the image has to be a specific RPM based distribution?

I am trying to understand the base facts/assumptions that are made by Atomic to work correctly.


> You can build build Docker image with `RUN` label where you specify
> command that is expected to be run to start this image.
> Then when you run `atomic run <yourimage>`, Atomic first inspects image,
> and if finds RUN label uses its value to start container.
> 
> Atomic makes easier to run AtomicApp.
> You can run AtomicApp without atomic (see:
> https://github.com/projectatomic/atomicapp/blob/master/atomicapp.sh#L9)
> But because this is a lot of parameters, it is easier to use atomic and
> just do `atomic run <atomicappimage>`.
> Atomic than reads RUN label from image and assemble full docker run
> command
> (https://github.com/projectatomic/atomicapp/blob/master/Dockerfiles.pkgs/Dockerfile.centos#L13)
> 

This example makes it super clear to me why Atomic exists. Kudos!

> Atomic cmd just makes running AtomicApp containers little easier that's
> all :-) you can run AtomicApp even without it.
> 
> Hope this helps ;-)
> 
> 


Thanks!

Regards,
Saleem