I dockerized a rails application which runs perfectly on my local machine. I configured my Github Actions to push the application into a private image on Docker Hub and when I try to pull and run it locally or on another machine, it pulls the image but the container then exits because Rails fails with the following error:
app | rm: cannot remove 'tmp/pids/server.pid': No such file or directory
app | => Booting Puma
app | => Rails 6.0.3.3 application starting in development
app | => Run `rails server --help` for more startup options
app | Exiting
app | (erb):9:in `<main>': Cannot load database configuration: (NoMethodError)
app | undefined method `[]' for nil:NilClass
app | from /usr/local/lib/ruby/2.7.0/erb.rb:905:in `eval'
app | from /usr/local/lib/ruby/2.7.0/erb.rb:905:in `result'
app | from /usr/local/bundle/gems/railties-6.0.3.3/lib/rails/application/configuration.rb:228:in `database_configuration'
I commented out the rm command and also both bin/rails commands to see if I can get the container to stay up and debug in the console but I had no chance.
From searching other SO questions I suppose there must be something wrong with my ENV or the database.yml in general but I don't understand why it runs perfectly when I don't pull the image from Docker Hub. Shouldn't the credentials be resolved either way? There are credentials for every environment in separate credential files.
Here is my code:
docker-compose.yml
version: '3'
volumes:
db_data:
driver: local
app_data:
driver: local
services:
# database container
postgres:
image: postgres
volumes:
- app_data:/var/lib/postgresql/data
ports:
- 5439:5432
environment:
POSTGRES_DB: $DATABASE_NAME
POSTGRES_USER: $DATABASE_USER
POSTGRES_PASSWORD: $DATABASE_PASSWORD
command: ["postgres", "-c", "log_statement=all"]
restart: always
backend:
build: ./server
volumes:
- ./server:/var/workdir
ports:
- "3009:3000"
depends_on:
- postgres
Dockerfile
FROM ruby:2.7.1
WORKDIR /var/workdir
COPY . /var/workdir
# Install NodeJS and Yarn.
RUN curl https://deb.nodesource.com/setup_12.x | bash
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
RUN apt-get update && apt-get install -y nodejs yarn
RUN yarn install --check-files
RUN bundle install
ENV PORT 3000
EXPOSE $PORT
CMD /var/workdir/entrypoint.sh
entrypoint.sh
#!/bin/bash
rm tmp/pids/server.pid
bin/rails db:create
bin/rails db:migrate
bin/rails server -b 0.0.0.0 -p $PORT
config/database.yml
# PostgreSQL. Versions 9.3 and up are supported.
default: &default
adapter: postgresql
encoding: unicode
pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
host: postgres
port: 5432
database: <%= Rails.application.credentials.database[:name] %>
username: <%= Rails.application.credentials.database[:username] %>
password: <%= Rails.application.credentials.database[:password] %>
development:
<<: *default
test:
<<: *default
production:
<<: *default
.github/workflows/main.yml
name: App
on:
push:
branches:
- main
pull_request:
branches:
- main
jobs:
build:
runs-on: ubuntu-latest
services:
postgres:
image: postgres
env:
POSTGRES_DB: ${{ secrets.DATABASE_NAME }}
POSTGRES_USER: ${{ secrets.DATABASE_USER }}
POSTGRES_PASSWORD: ${{ secrets.DATABASE_PASSWORD }}
ports:
- 5439:5432
# needed because the postgres container does not provide a healthcheck
options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
steps:
- name: Checkout repo
uses: actions/checkout@v2
- name: Install PostgreSQL package
run: |
sudo apt-get -yqq install libpq-dev
- name: Install yarn
run: yarn install --check-files
- uses: actions/setup-node@v1
with:
node-version: '12.13.0'
- name: Setup Ruby
uses: actions/setup-ruby@v1
with:
ruby-version: 2.7.1
- name: Ruby gem cache
uses: actions/cache@v2
with:
path: vendor/bundle
key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
restore-keys: |
${{ runner.os }}-gems-
- name: Build and create DB
env:
RAILS_ENV: test
RAILS_MASTER_KEY: ${{ secrets.RAILS_MASTER_KEY }}
run: |
cd server
gem install bundler
bundle config path vendor/bundle
bundle install --jobs 4 --retry 3
bin/rails db:setup
deploy:
runs-on: ubuntu-latest
needs: build
steps:
- uses: actions/checkout@v2
- name: Docker login
run: docker login -u ${{ secrets.DOCKER_USER }} -p ${{ secrets.DOCKER_PASSWORD }}
- name: Build
run: docker build -t app ./server
- name: Tags
run: |
docker tag app ${{ secrets.DOCKER_USER }}/app
docker tag app ${{ secrets.DOCKER_USER }}/app:latest
- name: Push
run: |
docker push ${{ secrets.DOCKER_USER }}/app
docker push ${{ secrets.DOCKER_USER }}/app:latest
UPDATE: By adding the master.key as a secret to Github Actions, the error in the pipeline reads:
rails aborted!
ActiveSupport::MessageEncryptor::InvalidMessage: Cannot load database configuration:
ActiveSupport::MessageEncryptor::InvalidMessage
(...)
Caused by:
OpenSSL::Cipher::CipherError:
When instead I add the test.key as a secret, the original error returns.
This is the docker-compose.yml I created locally to fetch and run the image from Docker Hub:
version: '3'
services:
app:
image: user/app:latest
I replaced all user and repo names for this question.
