mastodon/config/database.yml

default: &default
  adapter: postgresql
  pool: <%= ENV["DB_POOL"] || ENV['MAX_THREADS'] || 5 %>
  timeout: 5000
  connect_timeout: 15
  encoding: unicode
  sslmode: <%= ENV['DB_SSLMODE'] || "prefer" %>

development:
  <<: *default
  database: <%= ENV['DB_NAME'] || 'mastodon_development' %>
  username: <%= ENV['DB_USER'] %>
  password: <%= (ENV['DB_PASS'] || '').to_json %>
  host: <%= ENV['DB_HOST'] %>
  port: <%= ENV['DB_PORT'] %>

# 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: <%= ENV['DB_NAME'] || 'mastodon' %>_test<%= ENV['TEST_ENV_NUMBER'] %>
  username: <%= ENV['DB_USER'] %>
  password: <%= (ENV['DB_PASS'] || '').to_json %>
  host: <%= ENV['DB_HOST'] %>
  port: <%= ENV['DB_PORT'] %>

production:
  <<: *default
  database: <%= ENV['DB_NAME'] || 'mastodon_production' %>
  username: <%= ENV['DB_USER'] || 'mastodon' %>
  password: <%= (ENV['DB_PASS'] || '').to_json %>
  host: <%= ENV['DB_HOST'] || 'localhost' %>
  port: <%= ENV['DB_PORT'] || 5432 %>
  prepared_statements: <%= ENV['PREPARED_STATEMENTS'] || 'true' %>