[Caml-list] Create a deployable application unit from OPAM?

[Hans Ole Rafaelsen <hrafaelsen@gmail.com>]

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Hi,

I have small application written using Ocsigen. Ocaml and the rest of the
development environment is installed using OPAM.

Now I want to install this application on a few other nodes, without having
to bring bring along the whole development process for deployment on each
node. What I want to end up with, is a single unit, e.g a tar-file, a
docker container or similar, that can be copied and deployed to the target
nodes. This unit should only contain the binaries needed to run the
application.

I have tried to ask on the Ocsigen mailing-list how do do this for Ocsigen
applications, but without success. But I guess the problem is more related
to how to deploy applications built using OPAM. I did not find any way to
do this with OPAM, but I might have missed something. I have tried to copy
all the binary files (.so, .cmxa .cmxs, etc) from the OPAM directory and
setting the environment variables to point the this new location, but
without much success. When starting ocsigenserver it was not able to solve
all symbols. Looking more into the problem, it looks like binaries such as
ocsigenserver has hard coded the location of the OPAM development
environment. Might be possible to override this using environment
variables, but I'm not sure how. So I gave up on this track.


Is there a way to generate such a deployable unit from OPAM development
environment?

Do anyone have some tips / best practice on how to deploy applications
built using OPAM?

(I'm developing and want to deploy on Ubuntu 16.04.)

Regards,

Hans Ole Rafaelsen

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