This Dockerfile provides a full installation of Erlang on Alpine, intended for running Erlang releases, so it has no build tools installed. The Erlang installation is provided so one can avoid cross-compiling releases. The caveat of course is if one has NIFs which require a native compilation toolchain, but that is left as an exercise for the reader.
NOTE: This image sets up a default user, with home set to /opt/app and owned by that user. The working directory
is also set to $HOME. It is highly recommended that you add a USER default instruction to the end of your
Dockerfile so that your app runs in a non-elevated context.
To boot straight to a prompt in the image (may look different if running a more recent version, but you get the gist):
$ docker run --rm -it --user=root bitwalker/alpine-erlang erl
Erlang/OTP 20 [erts-9.2] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]
Eshell V9.2 (abort with ^G)
1>
BREAK: (a)bort (c)ontinue (p)roc info (i)nfo (l)oaded
(v)ersion (k)ill (D)b-tables (d)istribution
a
Extending for your own application:
FROM bitwalker/alpine-erlang:latest
# Set exposed ports
EXPOSE 5000
ENV PORT=5000
ENV MIX_ENV=prod
ADD yourapp.tar.gz ./
USER default
ENTRYPOINT ["./bin/yourapp"]
CMD ["foreground"]MIT