Deploying Rails app to Heroku
This is my memo on Deploying Rails app to Heroku.
About Heroku
- A hosted platform built specifically for deploying Rails and other web applications.
- Makes deploying Rails applications ridiculously easy as long as your source code is under version control with Git.
- Uses the PostgreSQL database (NOTE: You need to add the ‘pg’ gem to allow Rails to talk to Postgres)
Heroku Commands
Heroku config variables
Heroku setup (one time per machine)
Create a Heroku repo for the app
$ git commit -am "Add hello" # Make sure that all changes are committed.
$ heroku create
Before deployment
# Prepare the assets for production.
$ bundle exec rake tmp:cache:clear
$ RAILS_ENV=production bundle exec rake assets:precompile
# Make sure nothing is broken.
$ bundle exec rake test
# Push all the changes to remote repo.
$ git add -A
$ git commit -m "Commit message"
$ git push
Push the app to the Heroku repo
On a production site, with little traffic
$ git push heroku master # Push up to Heroku repo
$ heroku run rake db:migrate # Inform Heroku of our db schema
On a production site, with significant traffic (maintenance mode)
$ heroku maintenance:on
$ git push heroku master # Push up to Heroku repo
$ heroku run rake db:migrate # Inform Heroku of our db schema
$ heroku maintenance:off
Deploy the app, and populate the production database with sample users
$ git push heroku master # Push up to Heroku repo
$ heroku pg:reset DATABASE # reset the production database
$ heroku run rake db:migrate
$ heroku run rake db:seed
$ heroku restart
Rename the Heroku URL
- NOTE: Don’t forget to change necessary configurations because renaming the project will cause its url to change as well.
$ heroku rename <new-name>
Diagnose problems at Heroku
$ heroku logs$ heroku run rails console$ heroku run console --sandbox
Delete and Redeploy Rails app to heroku
# 1. Destroy the Heroku repo.
$ heroku apps:destroy --app sample_app
# 2. Create a new Heroku repo.
$ heroku create sample_app
# 3. Push the project to the new Heroku repo.
$ git push heroku -u master
Push to a specific app at Heroku
$ heroku git:remote -a falling-wind-1624
Remove build pack
$ heroku config:unset BUILDPACK_URL