I am trying to deploy the example Elixir app by following the getting started guide, but fly deploy fails with a segfault on an Apple M1.
After adding python2 as an additional dependency to the Dockerfile (otherwise the node-gyp rebuild fails during [build 9/16] RUN npm --prefix ./assets ci --progress=false --no-audit --loglevel=error because python is not found, perhaps this needs to be fixed in the getting-started Dockerfile?), a local docker build works, but only for arm64:
$ docker build .
[+] Building 0.8s (27/27) FINISHED
=> [internal] load build definition from Dockerfile 0.1s
=> => transferring dockerfile: 2.10kB 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 34B 0.0s
=> [internal] load metadata for docker.io/library/alpine:3.13.3 0.7s
=> [internal] load metadata for docker.io/hexpm/elixir:1.12.1-erlang-24.0.1-alpine-3.13.3 0.7s
=> [build 1/16] FROM docker.io/hexpm/elixir:1.12.1-erlang-24.0.1-alpine-3.13.3@sha256:4eefe11eb82f277cd82ba5d792b82c0e82f7d41e3a021676b5f1eb1 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 2.84kB 0.0s
=> [app 1/5] FROM docker.io/library/alpine:3.13.3@sha256:826f70e0ac33e99a72cf20fb0571245a8fee52d68cb26d8bc58e53bfa65dcdfa 0.0s
=> CACHED [app 2/5] RUN apk add --no-cache libstdc++ openssl ncurses-libs 0.0s
=> CACHED [app 3/5] WORKDIR /app 0.0s
=> CACHED [app 4/5] RUN chown nobody:nobody /app 0.0s
=> CACHED [build 2/16] RUN apk add --no-cache build-base npm python2 0.0s
=> CACHED [build 3/16] WORKDIR /app 0.0s
=> CACHED [build 4/16] RUN mix local.hex --force && mix local.rebar --force 0.0s
=> CACHED [build 5/16] COPY mix.exs mix.lock ./ 0.0s
=> CACHED [build 6/16] COPY config config 0.0s
=> CACHED [build 7/16] RUN mix deps.get --only prod && mix deps.compile 0.0s
=> CACHED [build 8/16] COPY assets/package.json assets/package-lock.json ./assets/ 0.0s
=> CACHED [build 9/16] RUN npm --prefix ./assets ci --progress=false --no-audit --loglevel=error 0.0s
=> CACHED [build 10/16] COPY priv priv 0.0s
=> CACHED [build 11/16] COPY assets assets 0.0s
=> CACHED [build 12/16] RUN npm run --prefix ./assets deploy 0.0s
=> CACHED [build 13/16] RUN mix phx.digest 0.0s
=> CACHED [build 14/16] COPY lib lib 0.0s
=> CACHED [build 15/16] COPY rel rel 0.0s
=> CACHED [build 16/16] RUN mix do compile, release 0.0s
=> CACHED [app 5/5] COPY --from=build --chown=nobody:nobody /app/_build/prod/rel/hello_elixir ./ 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:9a12e58ad929571d205cc15b4f203f3fc9ad9f9f5b1fd9d3f30ac34377862960
The build for amd64 fails, which is not entirely unexpected:
$ docker build --platform linux/amd64 .
[+] Building 2.2s (16/26)
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 37B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 34B 0.0s
=> [internal] load metadata for docker.io/library/alpine:3.13.3 1.6s
=> [internal] load metadata for docker.io/hexpm/elixir:1.12.1-erlang-24.0.1-alpine-3.13.3 1.6s
=> [internal] load build context 0.0s
=> => transferring context: 2.84kB 0.0s
=> [app 1/5] FROM docker.io/library/alpine:3.13.3@sha256:826f70e0ac33e99a72cf20fb0571245a8fee52d68cb26d8bc58e53bfa65dcdfa 0.0s
=> [build 1/16] FROM docker.io/hexpm/elixir:1.12.1-erlang-24.0.1-alpine-3.13.3@sha256:4eefe11eb82f277cd82ba5d792b82c0e82f7d41e3a021676b5f1eb1 0.0s
=> CACHED [app 2/5] RUN apk add --no-cache libstdc++ openssl ncurses-libs 0.0s
=> CACHED [app 3/5] WORKDIR /app 0.0s
=> CACHED [app 4/5] RUN chown nobody:nobody /app 0.0s
=> CACHED [build 2/16] RUN apk add --no-cache build-base npm python2 0.0s
=> CACHED [build 3/16] WORKDIR /app 0.0s
=> CACHED [build 4/16] RUN mix local.hex --force && mix local.rebar --force 0.0s
=> CACHED [build 5/16] COPY mix.exs mix.lock ./ 0.0s
=> CACHED [build 6/16] COPY config config 0.0s
=> ERROR [build 7/16] RUN mix deps.get --only prod && mix deps.compile 0.5s
------
> [build 7/16] RUN mix deps.get --only prod && mix deps.compile:
#16 0.482 qemu: uncaught target signal 11 (Segmentation fault) - core dumped
#16 0.487 Segmentation fault
------
executor failed running [/bin/sh -c mix deps.get --only prod && mix deps.compile]: exit code: 139
I have seen that the suggested fix (discussed here and here) is to run fly deploy --remote-only, but this also errors out (tried it for 2 different Elixir apps):
$ fly deploy --remote-only
Deploying summer-pine-7691
==> Validating app configuration
--> Validating app configuration done
Services
TCP 80/443 ⇢ 4000
Error error connecting to docker: An unknown error occured.
Is there anything else I can do short of using an external service to build the docker image for the right arch? I tried setting up a Rosetta-emulated brew installation to run Docker under x84_64, but Docker then complains about the wrong architecture, even if I launch it explicitly under rosetta using arch -x86_64 ..., so at this point I’m not sure what else to try.