Nefcairon

Deployment of NX.Explorer to fly.io

Hello,

In my attempt to develop a phoenix web app I have created a fly.io account. fly.io requires a docker image and I get following error when I use docker build .:

Step 10/30 : RUN mix deps.get --only prod &&     mix deps.compile
 ---> Running in d9c1165e2bfa
* Getting explorer (https://github.com/elixir-nx/explorer.git - origin/main)
** (Mix) Error fetching/updating Git repository: the "git" executable is not available in your PATH. Please install Git on this machine or pass --no-deps-check if you want to run a previously built application on a system without Git.
The command '/bin/sh -c mix deps.get --only prod &&     mix deps.compile' returned a non-zero code: 1

This is happening because one dep in mix.exs is from github:
{:explorer, "~> 0.1.0-dev", github: "elixir-nx/explorer"

As I have never used docker, I ask for help. Do I have to change the dockerfile? I use the one from Getting Started · Fly Docs.

22 comments

/phoenix #docker #flyio

0 4685 22

2022-09-05 15:30:12 UTC

Marked As Solved

andrewb

Hi @Nefcairon,

I was working through this problem yesterday as well.

In the end, I installed nodejs and npm packages on the BUILDER image, changed the order of the COPY commands and added npm install.

The NODE_ENV=production npx tailwindcss --postcss --minify -i css/app.css -o ../priv/static/assets/app.css && cd .. call is in your package.json file so it will be called when you call mix assets.deploy.

My final Dockerfile looks like this:

ARG BUILDER_IMAGE="hexpm/elixir:1.12.3-erlang-24.1.4-debian-bullseye-20210902-slim"
ARG RUNNER_IMAGE="debian:bullseye-20210902-slim"

FROM ${BUILDER_IMAGE} as builder

# install build dependencies
RUN apt-get update -y && apt-get install -y build-essential git nodejs npm \
    && apt-get clean && rm -f /var/lib/apt/lists/*_*

# prepare build dir
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force && \
    mix local.rebar --force

# set build ENV
ENV MIX_ENV="prod"

# install mix dependencies
COPY mix.exs mix.lock ./
RUN mix deps.get --only $MIX_ENV
RUN mkdir config

# copy compile-time config files before we compile dependencies
# to ensure any relevant config change will trigger the dependencies
# to be re-compiled.
COPY config/config.exs config/${MIX_ENV}.exs config/
RUN mix deps.compile

# Compile the release
COPY lib lib

COPY priv priv

COPY assets assets

RUN cd assets && npm install

RUN mix assets.deploy

RUN mix compile

# Changes to config/runtime.exs don't require recompiling the code
COPY config/runtime.exs config/

COPY rel rel
RUN mix release

# start a new build stage so that the final image will only contain
# the compiled release and other runtime necessities
FROM ${RUNNER_IMAGE}

RUN apt-get update -y && apt-get install -y libstdc++6 openssl libncurses5 locales \
  && apt-get clean && rm -f /var/lib/apt/lists/*_*

# Set the locale
RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen

ENV LANG en_US.UTF-8
ENV LANGUAGE en_US:en
ENV LC_ALL en_US.UTF-8

WORKDIR "/app"
RUN chown nobody /app

# Only copy the final release from the build stage
COPY --from=builder --chown=nobody:root /app/_build/prod/rel ./

USER nobody

# Create a symlink to the application directory by extracting the directory name. This is required
# since the release directory will be named after the application, and we don't know that name.
RUN set -eux; \
  ln -nfs /app/$(basename *)/bin/$(basename *) /app/entry

CMD /app/entry start

Post #19

Also Liked

thomas.fortes

You need to update the image that you’re using, the tutorial on fly.io uses an old version of alpine that has an old rust version than the 1.51 that @cschmatzler mentioned.

Change the first line from FROM hexpm/elixir:1.12.1-erlang-24.0.1-alpine-3.13.3 AS build to FROM hexpm/elixir:1.12.3-erlang-24.1.4-alpine-3.14.2 AS build to use a more recent one.

Also, you don’t need to insert new lines to add each new package, apk add works like apt, dnf, pacman and every other linux package manager, you can do it all in one line.

RUN apk add --no-cache build-base npm git rust cargo

Post #7

dimitarvp

To make sure you have smaller image, do this for the Rustup step:

RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- --default-toolchain stable --profile minimal --target x86_64-unknown-linux-gnu -y

The --profile minimal part is crucial and it shaved off ~500MB from our Docker image. With the default profile Rust is installed as if it’s on a development machine. The minimal profile is for servers / apps.

The --target x86_64-unknown-linux-gnu thing you can skip but I prefer to be explicit – 50/50, your call.

More info here: Profiles - The rustup book

Post #23

riebeekn

You will need to customize the build file depending on your particular needs. For instance since you need to grab a hex dependency via git, you’ll need to add git as part of the docker build dependencies, i.e.

# install build dependencies
RUN apk add --no-cache build-base npm git

Hopefully that will get you further along, unfortunately there is probably no avoiding learning at least some docker, there are a number of examples of phoenix specific docker files floating around if you search on this forum or hit up the google machine.

Post #2

Last Post!

talhaazeem-invozone

I am getting error on the npm install, any idea?

------
 > [builder 13/18] RUN cd assets && npm install:
#22 0.629 npm ERR! must provide string spec
#22 0.637
#22 0.637 npm ERR! A complete log of this run can be found in:
#22 0.637 npm ERR!     /root/.npm/_logs/2022-09-05T15_26_34_548Z-debug.log
------
Error failed to fetch an image or build from source: error building: executor failed running [/bin/sh -c cd assets && npm install]: exit code: 1

Post #24