Generic Host w/ Docker

https://echobind.com/blog/using-phoenix-with-docker/
- I completed this entirely and then went to the next...
http://teamon.eu/2017/deploying-phoenix-to-production-using-docker/ and https://github.com/Recruitee/mix_docker
- I got here from https://github.com/Nebo15/renew, so will go back to that.
- I was unable to mix docker.build command inside dcr web bash because obviously docker isn't installed inside the container. I had to install Elixir in the host and run it from there. :-(
- It looks like "sibling containers" are a possible solution to this http://stackoverflow.com/a/33003273/34315.
- Created the repository on Docker Hub first
- Use the name of that repository in config/config.exs
- mix docker.init
- mix docker.build
- mix docker.release
- mix docker.publish
- It pushes and tags the docker image https://hub.docker.com/r/gabrieljoelc/elixir-of-love/tags/. This is the deployment artifact.
- docker run -e PORT=4000 gabrieljoelc/elixir-of-love:0.0.1.1-d2412f7f2e foreground is failing with a "failed to connect: ** (DBConnection.ConnectionError) tcp connect (localhost:5432): connection refused - :econnrefused". I'm assuming it's because the image doesn't know how to connect to the database image.
  - Once I get this working I'm going to look into deploying the image to Heroku or to GCP.
  - Found additional documentation specifically for Phoenix, but mix docker.customize is missing.
  - Realized that I using 0.2.2 of mix_docker because I copied and pasted from http://teamon.eu/2017/deploying-phoenix-to-production-using-docker/. Updated to 0.4.2 and docker.customize worked.
  - Updated many things per the mix_docker Phoenix FAQ
  - Now getting "npm ERR! addLocal Could not install /opt/app/deps/phoenix npm ERR! addLocal Could not install /opt/app/deps/phoenix_html" when running mix docker.build
    - It's because there is a path mismatch between Dockerfile.build

WORKDIR /opt/app

ENV MIX_ENV=prod

# Cache node deps
COPY package.json ./
RUN npm install

and package.json:

"dependencies": {
  "phoenix": "file:deps/phoenix",
  "phoenix_html": "file:deps/phoenix_html"
}

I've tried lots of things but still can't figure it out.

I figured it out. The npm install line needed to be after mix deps.get runs so that deps/phoenix and deps/phoenix_html exist.
I got Dockerfile.release working with Docker Compose, but now I'm stuck on how to create a database for Dockerfile.release. I'm trying to create the prod database from within the docker-compose.yml web service:

# host
docker run -it --rm -e MIX_ENV=prod -e DB_HOST=db a540246dbcc5 /bin/bash

# container
MIX_ENV=prod mix deps.get
MIX_ENV=prod mix compile
MIX_ENV=prod mix ecto.create
07:10:27.256 [error] GenServer #PID<0.178.0> terminating
** (DBConnection.ConnectionError) tcp connect (${DB_HOST}:5432): non-existing domain - :nxdomain
    (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
    (connection) lib/connection.ex:622: Connection.enter_connect/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: nil
State: Postgrex.Protocol
** (Mix) The database for HelloWorld.Repo couldn't be created: an exception was raised:
    ** (DBConnection.ConnectionError) tcp connect (${DB_HOST}:5432): non-existing domain - :nxdomain
        (db_connection) lib/db_connection/connection.ex:148: DBConnection.Connection.connect/2
        (connection) lib/connection.ex:622: Connection.enter_connect/5
        (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3

Heroku Only

Without Docker (buildpacks)

Following the config steps on here.

Output: PR

With Docker

I'm going to try and use this

Misc work

web_1 | [error] backend port not found: :inotifywait - phoenixframework/phoenix#776 (comment)
vim for elixir - https://github.com/elixir-lang/vim-elixir depends on https://github.com/junegunn/vim-plug. Had to update .vimrc for vim-plug and vim-elixir.

Other resources I'm considering

gabrieljoelc/interweb_phoenix_docker_receipe.md

Generic Host w/ Docker

Heroku Only

Without Docker (buildpacks)

With Docker

Misc work

Other resources I'm considering