Capistrano::Cable

Capistrano::Cable helps to deploy standalone ActionCable server with Puma over systemd. It doesn't use a specific puma.rb for Puma configuration, it relies on given options.

Installation

Install the gem and add to the application's Gemfile by executing:

$ bundle add capistrano-cable

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install capistrano-cable

Usage

# Capfile

require 'capistrano/cable'
install_plugin Capistrano::Cable::Systemd

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

# Capfile

install_plugin Capistrano::Cable, load_hooks: false  # Default cable 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/cable'
install_plugin Capistrano::Cable

Config

Many options are available to customize the cable server configuration. Here are the main ones:

# config/deploy.rb or config/deploy/<stage>.rb
set :cable_role, :web
set :cable_port, 29292
# set :cable_limit_nofile, 65536 # optional, to customize if `Errno::EMFILE: Too many open files` happens
# set :cable_ssl_certificate
# set :cable_ssl_certificate_key
set :cable_rackup_file, 'cable/config.ru'
set :cable_dir, -> { File.join(release_path, "cable") }
set :cable_pidfile, -> { File.join(shared_path, "tmp", "pids", "cable.pid") }
set :cable_env, -> { fetch(:rack_env, fetch(:rails_env, fetch(:stage))) }
set :cable_access_log, -> { File.join(shared_path, "log", "cable.access.log") }
set :cable_error_log, -> { File.join(shared_path, "log", "cable.error.log") }
set :cable_phased_restart, -> { true }
set :cable_service_unit_env_files, -> { fetch(:service_unit_env_files, []) }
set :cable_service_unit_env_vars, -> { fetch(:service_unit_env_vars, []) }
set :cable_service_templates_path, fetch(:service_templates_path, "config/deploy/templates")

See Capistrao::Cable::Systemd#set_defaults for more details.

To enable SSL, set the cable_ssl_certificate and cable_ssl_certificate_key options. The both are required to enable SSL.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/codeur/capistrano-cable. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

Largely inspired from capistrano-puma gem.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Capistrano::Cable project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.