diff --git a/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt b/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt
index 3bb5a491dbb8..d58a81e7f5b0 100644
--- a/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt
+++ b/railties/lib/rails/generators/rails/app/templates/config/databases/postgresql.yml.tt
@@ -18,6 +18,11 @@ default: &default
   # For details on connection pooling, see Rails configuration guide
   # https://guides.rubyonrails.org/configuring.html#database-pooling
   pool: <%%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+  <%% if ENV["RAILS_DATABASE_HOST"] %>
+  host: <%%= ENV["RAILS_DATABASE_HOST"] %>
+  username: postgres
+  password: postgres
+  <%% end %>
 
 development:
   <<: *default