mastodon/config/database.yml

default: &default
  adapter: postgresql
  pool: 5
  timeout: 5000
  encoding: unicode

development:
  <<: *default
  database: mastodon_development

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  <<: *default
  database: mastodon_test

production:
  <<: *default
  database: <%= ENV['DB_NAME'] || 'mastodon_production' %>
  username: <%= ENV['DB_USER'] || 'mastodon' %>
  password: <%= ENV['DB_PASS'] || '' %>
  host: <%= ENV['DB_HOST'] || 'localhost' %>
  port: <%= ENV['DB_PORT'] || 5432 %>