Capistrano::Puma

Installation

Add this line to your application's Gemfile:

gem 'capistrano3-puma', github: "seuros/capistrano-puma"

or:

gem 'capistrano3-puma' , group: :development

And then execute:

$ bundle

Usage

    # Capfile

    require 'capistrano/puma'
    install_plugin Capistrano::Puma  # Default puma tasks
    install_plugin Capistrano::Puma::Workers  # if you want to control the workers (in cluster mode)
    install_plugin Capistrano::Puma::Jungle # if you need the jungle tasks
    install_plugin Capistrano::Puma::Monit  # if you need the monit tasks
    install_plugin Capistrano::Puma::Nginx  # if you want to upload a nginx site template

You will need to select your service manager

install_plugin Capistrano::Puma::Daemon  # If you using puma daemonized (not supported in Puma 5+)

or

install_plugin Capistrano::Puma::Systemd  # if you use SystemD 

To prevent loading the hooks of the plugin, add false to the load_hooks param.

    # Capfile

    require 'capistrano/puma'
    install_plugin Capistrano::Puma, load_hooks: false  # Default puma tasks without hooks
    install_plugin Capistrano::Puma::Monit, load_hooks: false  # Monit tasks without hooks

To make it work with rvm, rbenv and chruby, install the plugin after corresponding library inclusion.

    # Capfile
    
    require 'capistrano/rbenv'   
    require 'capistrano/puma'
    install_plugin Capistrano::Puma

Config

To list available tasks use cap -T

To upload puma config use:

cap production puma:config

By default the file located in shared/puma.rb

Ensure that tmp/pids and tmp/sockets log are shared (via linked_dirs):

This step is mandatory before deploying, otherwise puma server won't start

Nginx

To upload a nginx site config (eg. /etc/nginx/sites-enabled/) use:

cap production puma:nginx_config

To customize these two templates locally before uploading use:

rails g capistrano:nginx_puma:config

if your nginx server configuration is not located in /etc/nginx, you may need to customize:

set :nginx_sites_available_path, "/etc/nginx/sites-available"
set :nginx_sites_enabled_path, "/etc/nginx/sites-enabled"

By default, nginx_config will be executed with :web role. But you can assign it to a different role:

set :puma_nginx, :foo

or define a standalone one:

role :puma_nginx, %w{[email protected]}

Jungle

For Jungle tasks (beta), these options exist:

    set :puma_jungle_conf, '/etc/puma.conf'
    set :puma_run_path, '/usr/local/bin/run-puma'

Systemd

Install Systemd plugin in Capfile:

install_plugin Capistrano::Puma
install_plugin Capistrano::Puma::Systemd

To generate unit file use:

cap production puma:systemd:config puma:systemd:enable

To use customize environment variables

  set :puma_service_unit_env_file, '/etc/environment'

  set :puma_service_unit_env_vars, %w[
      RAILS_ENV=development
      PUMA_METRICS_HTTP=tcp://0.0.0.0:9393
  ]

Multi bind

Multi-bind can be set with an array in the puma_bind variable

  set :puma_bind, %w(tcp://0.0.0.0:9292 unix:///tmp/puma.sock)

* Listening on tcp://0.0.0.0:9292
* Listening on unix:///tmp/puma.sock

Active Record

For ActiveRecord the following line to your deploy.rb

    set :puma_init_active_record, true

Other configs

Configurable options, shown here with defaults: Please note the configuration options below are not required unless you are trying to override a default setting, for instance if you are deploying on a host on which you do not have sudo or root privileges and you need to restrict the path. These settings go in the deploy.rb file.

    set :puma_user, fetch(:user)
    set :puma_rackup, -> { File.join(current_path, 'config.ru') }
    set :puma_state, "#{shared_path}/tmp/pids/puma.state"
    set :puma_pid, "#{shared_path}/tmp/pids/puma.pid"
    set :puma_bind, "unix://#{shared_path}/tmp/sockets/puma.sock"    #accept array for multi-bind
    set :puma_control_app, false
    set :puma_default_control_app, "unix://#{shared_path}/tmp/sockets/pumactl.sock"
    set :puma_conf, "#{shared_path}/puma.rb"
    set :puma_access_log, "#{shared_path}/log/puma_access.log"
    set :puma_error_log, "#{shared_path}/log/puma_error.log"
    set :puma_role, :app
    set :puma_env, fetch(:rack_env, fetch(:rails_env, 'production'))
    set :puma_threads, [0, 16]
    set :puma_workers, 0
    set :puma_worker_timeout, nil
    set :puma_init_active_record, false
    set :puma_preload_app, false
    set :puma_daemonize, false
    set :puma_plugins, []  #accept array of plugins
    set :puma_tag, fetch(:application)
    set :puma_restart_command, 'bundle exec puma'
    set :puma_service_unit_name, "puma_#{fetch(:application)}_#{fetch(:stage)}"
    set :puma_systemctl_user, :system # accepts :user
    set :puma_enable_lingering, fetch(:puma_systemctl_user) != :system # https://wiki.archlinux.org/index.php/systemd/User#Automatic_start-up_of_systemd_user_instances
    set :puma_lingering_user, fetch(:user)
    set :puma_service_unit_env_file, nil
    set :puma_service_unit_env_vars, []

    set :nginx_config_name, "#{fetch(:application)}_#{fetch(:stage)}"
    set :nginx_flags, 'fail_timeout=0'
    set :nginx_http_flags, fetch(:nginx_flags)
    set :nginx_server_name, "localhost #{fetch(:application)}.local"
    set :nginx_sites_available_path, '/etc/nginx/sites-available'
    set :nginx_sites_enabled_path, '/etc/nginx/sites-enabled'
    set :nginx_socket_flags, fetch(:nginx_flags)
    set :nginx_ssl_certificate, "/etc/ssl/certs/#{fetch(:nginx_config_name)}.crt"
    set :nginx_ssl_certificate_key, "/etc/ssl/private/#{fetch(:nginx_config_name)}.key"
    set :nginx_use_ssl, false
    set :nginx_use_http2, true
    set :nginx_downstream_uses_ssl, false

Notes: If you are setting values for variables that might be used by other plugins, use append instead of set. For example:

append :rbenv_map_bins, 'puma', 'pumactl'

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request