Here is a little nice task to put in your /lib/capistrano/tasks folder. This will allow you to run any rake task on the server.
desc "Run rake task on server" task :server_rake do on roles(:app), in: :sequence, wait: 5 do within release_path do as :deploy do with rails_env: :production do execute :rake, ENV['task'], "RAILS_ENV=production" end end end end end
Then just run it by doing:
cap production server_rake task=db:seed