Share your Dockerfile and docker compose so that we can try to help you, because I use Docker for all my development stuff, including to run the Android Studio editor, that’s a very complex and heavy tool, and things just works, provided you have the correct setup and Operating System 
I use an Elixir Docker Stack with a lot of bash helpers that makes Elixir development a breeze and a joy, and I also run the editor from inside another docker container.
With pleasure !
Here is the new project directory:
The Dockerfile :
FROM elixir:latest
RUN mix local.hex --force &&\
mix local.rebar --force &&\
#This part could be removed as we do not need to install phoenix dependencies.
mix archive.install hex phx_new 1.4.16 --force
RUN apt-get update && \
## install inotify-tool for phoenix hot reload
apt-get install -y inotify-tools && \
# install nodejs and npm on globaly
curl -sL https://deb.nodesource.com/setup_14.x | bash - && \
apt-get install -y -q nodejs && \
# Install postgres client
apt-get install -y postgresql-client && \
# Clear apt cache
rm -rf /var/lib/apt/lists/*
WORKDIR /phoenix
COPY . /phoenix
EXPOSE 4000
The docker-compose file:
version: '3.7'
services:
db:
image: postgres:9.6
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD: postgres
PGDATA: /var/lib/postgresql/data/pgdata
restart: always
volumes:
- ./pgdata:/var/lib/postgresql/data
ports:
- "5432:5432"
phoenix:
build: .
volumes:
- .docker/phoenix/phoenix-setup.sh:/phoenix-setup.sh
command: ../phoenix-setup.sh
environment:
PGUSER: postgres
PGPASSWORD: postgres
PGDATABASE: portfolio
PGPORT: 5432
PGHOST: db
ports:
- "4000:4000"
depends_on:
- db
volumes:
pgdata:
And .dockerignore:
deps
_build
assets/node_modules
test
If you have any suggestion/reviews I will love to hear them.
Thanks a lot !
Just a quick question… Do you run your project code from within your editor, be it for running tests or anything else, like to open a iex session?
Generaly I just use my terminal not the one from the editor. For now i’m not working with docker containers on dev env as I need to restart them on each changes.
So just remove from your Dockerfile:
COPY . /phoenix
EXPOSE 4000
Add this:
WORKDIR /app
and fix your docker compose volume to:
- $PWD:/app
But his is running as root, and that is not good from a security point of view.
With this changes you don’t need to rebuild your image each time you change files in the host.
Just add inotify tools to the container and host OS and change the max number of files he can watch, and you are good to go.
#!/bin/sh
set -eu
Main()
{
apt install -y -q --no-install-recommends \
procps \
inotify-tools
printf "fs.inotify.max_user_watches=524288\n" > /etc/sysctl.d/01-inotify.conf
}
Main
I use this for years without any problems.
I am working on an Elixir Docker Stack that just makes everything a breeze, but not yet ready for others to try because the base image is not yet released in Docker Hub, therefore you cannot try it in your computer.
Well this is a nice fix but I don’t think that it resolve the shadowing issues of deps folder in the container, by using volumes it will pull all the local files into the container and shadow the stuff in the container… I just tried it and I got an error while loading Bcrypt on a sign-in method for example.
The shadowing issue is only an issue if you run mix deps.get and mix compile in both the host and the container, otherwise is a non issue. If you run in both than you just need to map each folder in your root project and leave out the deps, _build and I think the assets/node_modules folders.
This is a completely different issue, and is nothing related with shadowing, instead it means you are missing the OS dependencies to build bccrypt in the container or if you are running mix commands in both the host and in the container, then it may cause issues, because bcrypt was compiled for a different target, but without seeing the exact error is hard to say.
To resume if you don’t run mix commands in both the container and host, shadowing is a non issue.
The Dockerfile now as non root user with the id 1000. Please read the comments in the Dockerfile to see if you need to customize this id for your computer.
ARG TAG=latest
FROM elixir:${TAG}
ARG PHOENIX_VERSION=1.4.16
RUN apt-get update && \
## install inotify-tool for phoenix hot reload
apt-get install -y inotify-tools && \
# DO THE SAME IN YOUR HOST MACHINE
printf "fs.inotify.max_user_watches=524288\n" > /etc/sysctl.d/01-inotify.conf && \
# install nodejs and npm on globaly
curl -sL https://deb.nodesource.com/setup_14.x | bash - && \
apt-get install -y -q nodejs && \
# Add the user `developer` with id `1000`. Adjust `1000` to match the user in
# your host in order to avoid permissions issues between container and host.
# To check user id in host, just run: `id -u`
useradd -m -u 1000 -s /bin/bash developer && \
su developer -c 'mkdir -p /home/developer/phoenix' && \
# Install postgres client
apt-get install -y postgresql-client && \
# Clear apt cache
rm -rf /var/lib/apt/lists/*
USER developer
RUN mix local.hex --force &&\
mix local.rebar --force &&\
mix archive.install hex phx_new ${PHOENIX_VERSION} --force
WORKDIR /home/developer/phoenix
CMD ["bash"]
You can now build any combination of Elixir and Phoenix version:
docker build --build-arg "TAG=1.10" --build-arg "PHOENIX_VERSION=1.5.1" -t phoenix:1.10_1.5.1 .
I don’t have Elixir installed in my host, therefore I cannot test this docker compose file, but if I have not missed anything it will allow you to run mix commands from the host and container without causing issues:
# DONT USER VERSION £ UNLESS YOUR ARE USING DOCKER SWARM TO RUN THE CONTIANERS
version: '2.3'
services:
db:
image: postgres:9.6
environment:
POSTGRES_USER: postgres
POSTGRES_PASSWORD: postgres
PGDATA: /var/lib/postgresql/data/pgdata
restart: always
volumes:
- ./pgdata:/var/lib/postgresql/data
ports:
# IF POSTGRES IS ONLY USED BY THE PHOENIX SERVICE THEN YOU CAN REMOVE THIS PORT MAP
# This is listening to requests coming from outside your computer:
#- "5432:5432"
# Localhost only
- "127.0.0.1:5432:5432"
phoenix:
build: .
volumes:
- $PWD/assets/css:/home/developer/phoenix/assets/css
- $PWD/assets/js:/home/developer/phoenix/assets/js
- $PWD/assets/static:/home/developer/phoenix/assets/static
- $PWD/assets/package.json:/home/developer/phoenix/assets/package.json
- $PWD/assets/package-lock.json:/home/developer/phoenix/assets/package-lock.json
- $PWD/assets/webpack.config.js:/home/developer/phoenix/assets/webpack.config.js
- $PWD:/home/developer/phoenix/config
- $PWD:/home/developer/phoenix/lib
- $PWD:/home/developer/phoenix/priv
- $PWD/mix.exs:/home/developer/phoenix/mix.exs
- $PWD/mix.lock:/home/developer/phoenix/mix.lock
- $PWD/.formatter.exs:/home/developer/phoenix/.formatter.exs
# DONT KNOW WHAT IS DOING BUT PROBABLY YOU WANT TO ADJUST IT FOR THE NEW STACK.
#command: ../phoenix-setup.sh
command: mix phx.server
environment:
PGUSER: postgres
PGPASSWORD: postgres
PGDATABASE: portfolio
PGPORT: 5432
PGHOST: db
ports:
# Only visible to localhost, otherwise will be 0.0.0.0, meaning it will listen to requests coming from outsiide.
- "127.0.0.1:4000:4000"
depends_on:
- db
volumes:
pgdata: