How do I run a rake task from Capistrano?

Question

I already have a deploy.rb that can deploy my app on my production server.

My app contains a custom rake task (a .rake file in the lib/tasks directory).

I\

Answer 1

This also works:

run("cd #{release_path}/current && /usr/bin/rake <rake_task_name>", :env => {'RAILS_ENV' => rails_env})

More info: Capistrano Run

Answer 2

run("cd #{deploy_to}/current && /usr/bin/env rake `<task_name>` RAILS_ENV=production")

Found it with Google -- http://ananelson.com/said/on/2007/12/30/remote-rake-tasks-with-capistrano/

The RAILS_ENV=production was a gotcha -- I didn't think of it at first and couldn't figure out why the task wasn't doing anything.

Answer 3

This worked for me:

task :invoke, :command do |task, args|
  on roles(:app) do
    within current_path do
      with rails_env: fetch(:rails_env) do
        execute :rake, args[:command]
      end
    end
  end
end

Then simply run cap production "invoke[task_name]"

Answer 4

A little bit more explicit, in your \config\deploy.rb, add outside any task or namespace:

namespace :rake do  
  desc "Run a task on a remote server."  
  # run like: cap staging rake:invoke task=a_certain_task  
  task :invoke do  
    run("cd #{deploy_to}/current; /usr/bin/env rake #{ENV['task']} RAILS_ENV=#{rails_env}")  
  end  
end

Then, from /rails_root/, you can run:

cap staging rake:invoke task=rebuild_table_abc