Sinatra app in Docker failing to execute 'mysql'? - mysql

Question

This is my first real foray into Docker, and I'm a bit stuck at getting MySQL to play nicely with my app and I'm out of ideas on the why. I'm running the ruby:2.7.6 docker image which uses Debian. I'm trying to setup my database but I'm running into a MySQL issue.
➜ cx-core git:(master) ✗ docker compose run api bundle exec rake db:schema:load
[+] Running 2/0
⠿ Container cx-core-db-1 Running 0.0s
⠿ Container cx-core-redis-1 Running 0.0s
Starting backup.
Starting backup.
rake aborted!
failed to execute: `mysql`
Please check the output above for any errors and make sure that `mysql` is installed in your PATH and has proper permissions.
When running this command below, I am able to access the db with the credentials in my env vars. So, I'm guessing the mistake is somewhere in my docker-compose?
➜ cx-core git:(master) ✗ docker exec -it b773c7b1f960 mysql -u cx_core -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.0.28 MySQL Community Server - GPL
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
database.yml
default: &default
adapter: mysql2
encoding: utf8
pool: 5
username: <%= ENV['DB_USER'] || 'cx_core' %>
password: <%= ENV['DB_PASS'] || 'cx_core' %>
host: <%= ENV['DB_HOST'] || 'db' %>
port: 3306
development:
<<: *default
database: cx_core_dev
test:
<<: *default
database: cx_core_test
production:
<<: *default
database: cx_core_prod
dockerfile
FROM ruby:2.7.6
RUN apt-get update -qq && apt-get install -y build-essential mariadb-server mariadb-client gnupg
RUN gem install bundler
ENV GEM_HOME="/usr/local/bundle"
ENV PATH $GEM_HOME/bin:$GEM_HOME/gems/bin:$PATH
ENV APP_HOME /app
RUN mkdir $APP_HOME
WORKDIR $APP_HOME
COPY Gemfile* ./
COPY ["config.ru", "Gemfile", "Gemfile.lock", "Rakefile", "./"]
COPY /app /app
COPY config/ config/
COPY db/ db/
COPY lib/ lib/
COPY rakelib/ rakelib/
COPY bin/ bin/
EXPOSE 3000
docker-compose
version: "3.9"
services:
api:
build: .
depends_on:
- db
- redis
volumes:
- .:/app
- bundle_path:/usr/local/bundle/ # New
ports:
- "3000:3000"
environment:
- DB_HOST=db
- DB_USER=cx_core
- DB_NAME=cx_core
- DB_PASSWORD=cx_core
expose:
- 3000
command: bundle exec puma -p 3000
# entrypoint: ["./bin/start_dev.sh"]
networks:
- sinatra
db:
image: mysql
restart: always
environment:
- MYSQL_DATABASE=cx_core_dev
- MYSQL_USER=cx_core
- MYSQL_PASSWORD=cx_core
- MYSQL_ROOT_PASSWORD=cx_core
ports:
- '3306:3306'
expose:
- '3306'
volumes:
- db_data:/var/lib/mysql
networks:
- sinatra
redis:
image: 'redis:4.0-alpine'
command: redis-server --requirepass yourpassword
volumes:
- 'redis:/data'
volumes:
redis:
bundle_path: # New
db_data:
networks:
sinatra:
driver: bridge

Answer 1

I think you're missing step with bundle install in your Dockerfile.
Try to add this:
COPY Gemfile* ./
RUN mkdir -p ~/.ssh && ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts
RUN --mount=type=ssh bundle install --jobs 2
before the line COPY ["config.ru", "Gemfile", "Gemfile.lock", "Rakefile", "./"] in your Dockerfile.