Backend
The backend is written in Rails with Postgresql as the main database and hosted on heroku. The entire backend is developed in the linux environment.
info
You can visit the repo here: https://github.com/Zxun2/cvwo-assignment-backend
Running Backend Development Server on Docker​
# Build image
docker-compose build
# Set up database
docker-compose run web bundle exec rails db:create
docker-compose run web bundle exec rails db:migrate
# Rebuild any modified images and run in detached mode
docker-compose up --build -d
Backend Troubleshoot​
Error starting userland proxy: listen tcp 0.0.0.0:5432: bind: address already in use
Reason: Port 5432 is already in use on local machine. This is most likely that there is another PostgreSQL server running locally. Solution: Either stop the PostgreSQL on local machine or map to another port in docker-compose.yml, like - '5434:5432'.
Your Ruby version is 2.6.5, but your Gemfile specified 3.0.3
ERROR: Service 'web' failed to build: The command '/bin/sh -c bundle install' returned a non-zero code: 18
Reason: There is a Ruby version mismatch between Gemfile and Docker container.
Solution: Either update the Ruby version in Gemfile to 2.6.5, or pull explicitly Ruby 3.0.3 image in Dockerfile like FROM ruby:3.0.3-alpine.
Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.40/containers/json: dial unix /var/run/docker.sock: connect: permission denied
Solution:
# Restart docker
sudo systemctl restart docker
# Create docker group
sudo groupadd docker
# Add your user to the docker group
sudo usermod -aG docker ${USER}
# Relogin
su - ${USER}
Shutting down server​
# Removes running containers
docker-compose down
General Docker Troubleshooting​
# Removes all inactive images
docker image prune -a
# Removes all inactive containers
docker ps prune -a
# Removes all inactive networks
docker network prune -a
Contributing​
If you have a suggestion that would make this better, please fork the repo and create a pull request.
License​
Distributed under the MIT License. See LICENSE for more information.