Custom Rails Tasks
Many of these tasks probably require Capistrano::Rails.
Run arbitrary rake tasks from environment variables
namespace :deploy do desc 'Runs any rake task, cap deploy:rake task=db:rollback' task rake: [:set_rails_env] do on release_roles([:db]) do within release_path do with rails_env: fetch(:rails_env) do execute :rake, ENV['task'] end end end end end
Passes in the rake task to be run via an environment variable. Also a simple example of running a rake task on the server.
bundle exec cap production deploy:rake task=db:seed
Arising from Capistrano/Rails issue #199
A frequent issue on deploy are slow migrations which involve downtime. In this case, you often want to run the migrations conditionally, where the main deploy doesn’t run them, but you can do so manually at a better point. To do so, you could put the following in your
require 'capistrano/rails/migrations' if ENV['RUN_MIGRATIONS']
Now the migrations do not run by default, but they will run with the following command:
RUN_MIGRATIONS=1 bundle exec cap production deploy:migrate