puma_capistrano.rb

after 'deploy:stop', 'puma:stop'
after 'deploy:start', 'puma:start'
after 'deploy:restart', 'puma:restart'

_cset(:puma_cmd) { "#{fetch(:bundle_cmd, 'bundle')} exec puma" }
_cset(:pumactl_cmd) { "#{fetch(:bundle_cmd, 'bundle')} exec pumactl" }
_cset(:puma_state) { "#{shared_path}/sockets/puma.state" }
_cset(:puma_role) { :app }

namespace :puma do
  desc 'Start puma'
  task :start, :roles => lambda { fetch(:puma_role) }, :on_no_matching_servers => :continue do
    puma_env = fetch(:rack_env, fetch(:rails_env, 'production'))
    run "cd #{current_path} && #{fetch(:puma_cmd)} -q -d -e #{puma_env} -b 'tcp://127.0.0.1:9292' -S #{fetch(:puma_state)} --control 'unix://#{shared_path}/sockets/pumactl.sock'", :pty => false
  end

  desc 'Stop puma'
  task :stop, :roles => lambda { fetch(:puma_role) }, :on_no_matching_servers => :continue do
    run "cd #{current_path} && #{fetch(:pumactl_cmd)} -S #{fetch(:puma_state)} stop"
  end

  desc 'Restart puma'
  task :restart, :roles => lambda { fetch(:puma_role) }, :on_no_matching_servers => :continue do
    run "cd #{current_path} && #{fetch(:pumactl_cmd)} -S #{fetch(:puma_state)} restart"
  end

  desc "Status of puma"
  task :status, :roles => lambda { fetch(:puma_role) }, :on_no_matching_servers => :continue do
    run "cd #{current_path} && #{fetch(:pumactl_cmd)} -S #{fetch(:puma_state)} stats"
  end
end