Having issues with Phoenix's docs about containers and releases

polygonpusher · April 28, 2021, 7:46pm

I have stood up a very basic vanilla phoenix app in hopes to better learn about how I can deploy clusters,

When reviewing the docs I found this example Dockerfile. Deploying with Releases — Phoenix v1.7.10

I copied said Dockerfile

joshchernoff/cluster_example/blob/main/Dockerfile

FROM elixir:1.11.4-alpine AS build

# install build dependencies
RUN apk add --no-cache build-base npm git python2

# prepare build dir
WORKDIR /app

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

# set build ENV
ENV MIX_ENV=prod
ENV DATABASE_URL="ecto://postgres:foobar@db/cluster_example_dev"
ENV SECRET_KEY_BASE="0iacSYSbi6X4WtsJ5UA7BTYAewnsOJnKjGvtmESKUvMwFoiQgj6X6k4paw6Y59NC"
ENV COOKIE="foobar"
ENV ERL_DIST_PORT=8001

# install mix dependencies

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But I found that the copy command does not copy any files but also does not fail.

As we can see the command runs and does not error.

gist.github.com

https://gist.github.com/joshchernoff/b3d1e82642a383135335a3ece2f12ae6#file-gistfile1-txt-L37

gistfile1.txt

cluster_example main % docker compose build --no-cache
[+] Building 267.2s (30/43)
 => [cluster_example_app2 internal] load build definition from Dockerfile                                                                                                    0.0s
 => => transferring dockerfile: 32B                                                                                                                                          0.0s
 => [cluster_example_app1 internal] load build definition from Dockerfile                                                                                                    0.0s
 => => transferring dockerfile: 32B                                                                                                                                          0.0s
 => [cluster_example_app2 internal] load .dockerignore                                                                                                                       0.0s
 => => transferring context: 2B                                                                                                                                              0.0s
 => [cluster_example_app1 internal] load .dockerignore                                                                                                                       0.0s
 => => transferring context: 2B                                                                                                                                              0.0s

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But when running ls the dir for /app/ we see there is no bin folder in the app dir.

gist.github.com

https://gist.github.com/joshchernoff/b3d1e82642a383135335a3ece2f12ae6#file-gistfile1-txt-L57

gistfile1.txt

cluster_example main % docker compose build --no-cache
[+] Building 267.2s (30/43)
 => [cluster_example_app2 internal] load build definition from Dockerfile                                                                                                    0.0s
 => => transferring dockerfile: 32B                                                                                                                                          0.0s
 => [cluster_example_app1 internal] load build definition from Dockerfile                                                                                                    0.0s
 => => transferring dockerfile: 32B                                                                                                                                          0.0s
 => [cluster_example_app2 internal] load .dockerignore                                                                                                                       0.0s
 => => transferring context: 2B                                                                                                                                              0.0s
 => [cluster_example_app1 internal] load .dockerignore                                                                                                                       0.0s
 => => transferring context: 2B                                                                                                                                              0.0s

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Heres my docker info

On OSX 11.2.1

polygonpusher · April 28, 2021, 10:17pm

Ah found it, in my compose I overwrote the app folder with my own app dir volume thus it would remove the bin folder.

Lesson: Don’t mix your dev and prod docker compose apps.