Can’t you install already compiled Erlang for CentOS 7 btw?
dimitarvp
pcriv
I don’t think the have the latest version.
I tried the approach you suggested using those docker images from hexpm and now I get a slightly different error:
root@ca9d0e762504:/app# _build/prod/rel/topo_master/bin/topo_master start
/app/_build/prod/rel/topo_master/releases/1.4.0/../../erts-14.2.1/bin/erl: 12: exec: /app/_build/prod/rel/topo_master/erts-14.2.1/bin/erlexec: Exec format error
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dimitarvp
Dunno man, sounds like you are compiling for a different CPU architecture to me. 
One example on SO (though with Golang): https://stackoverflow.com/questions/52939149/exec-format-error-with-docker-run-command
You should double check. Are you building inside the CentOS 7 container and then just copying the release to the baremetal CentOS 7 machines? If so, it can still be a mismatch e.g. the build container is having a x64 CPU and the prod machines use ARM?
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pcriv
I finally found the issue… the problem is that when I was copying the files to the container, I was also copying the _build and deps folders from my machine, and that is where everything got mixed.
Added a .dockerignore to exclude those folders and at least now the app tries to start… got a whole set of errors now but a lot less obscure.
Thanks for the help
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