deploy_a_rails_app_to_heroku.md

How to Deploy a Rails App to Heroku

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git fetch staging
git log staging/main..main
git diff --stat staging/main

If necessary, add new environment variables.

heroku config:add NEW_VARIABLE=value --remote staging

Deploy to Heroku staging.

git push staging

If necessary, run migrations and restart the dynos.

heroku run rake db:migrate --remote staging
heroku restart --remote staging

Introspect to make sure everything's ok.

watch heroku ps --remote staging

Test the feature in browser.

Deploy to production.

git fetch production
git log production/main..main
git diff --stat production/main
heroku config:add NEW_VARIABLE=value --remote production
git push production
heroku run rake db:migrate --remote production
heroku restart --remote production
watch heroku ps --remote production

Watch logs and metrics dashboards.

Close pull request and comment Merged.

Set Up Production Environment

• Make sure that your Procfile is set up to run Unicorn.
• Make sure the PG Backups add-on is enabled.
• Create a read-only Heroku Follower for your production database. If a Heroku database outage occurs, Heroku can use the follower to get your app back up and running faster.