Capistrano::DelayedJob

Capistrano tasks for automatic DelayedJob configuration.

Goals of this plugin:

• automatic DelayedJob configuration for Rails apps
• no manual ssh to the server required

Specifics:

• generates an init script on the server for Delayed job
• capistrano tasks for management, example: delayed_job:restart
  see below for all available tasks

capistrano-delayed-job works only with Capistrano 3!

Inspired by capistrano-nginx-unicorn and capistrano-recipes.

Installation

Add this to Gemfile:

group :development do
  gem 'capistrano', '~> 3.1'
  gem 'capistrano-delayed-job', '~> 1.0'
end

And then:

$ bundle install

Setup and usage

Add this line to Capfile

require 'capistrano/delayed_job'

Setup task

Make sure the deploy_to path exists and has the right privileges on the server (i.e. /var/www/myapp).
Or just install capistrano-safe-deploy-to plugin and don't think about it.

To setup the DelayedJob on the servers with the delayed_job_server_role (default :app) run:

$ bundle exec cap production setup

This will generate the init script for delayed job.

Configuration

As described in the Usage section, this plugin works with minimal setup. However, configuration is possible.

You'll find the options and their defaults below.

In order to override the default, put the option in the stage file, for example:

# in config/deploy/production.rb
set :delayed_job_workers, 10

Defaults are listed near option name in the first line.

• set :delayed_job_workers # defaults to 1
  The number of workers to run on each server.

• set :delayed_job_server_roles, "[:app]"
  The roles on which the DelayedJob should run.

• set :delayed_job_service, -> { "delayed_job_#{fetch(:application)}_#{fetch(:stage)}" }
  The name of the service that DelayedJob uses.

• set :delayed_job_monit_enabled, false
  Use monit to monitor DelayedJob processes. This is especially useful on roles with constrained memory. On these nodes, DelayedJob processes are regularly killed by the OS. In order to use this setting, install monit on roles that run DelayedJob and start monit's httpd server. See (here)[http://mmonit.com/monit/documentation/monit.html#MONIT-HTTPD] for instructions.

Template customization

If you want to change default templates, you can generate them using rails generator:

$ bundle exec rails g capistrano:delayed_job:config

This will copy default templates to config/deploy/templates directory, so you can customize them as you like, and capistrano tasks will use this templates instead of default.

You can also provide path, where to generate templates:

$ bundle exec rails g capistrano:delayed_job:config config/templates

More Capistrano automation?

If you'd like to streamline your Capistrano deploys, you might want to check these zero-configuration, plug-n-play plugins:

• capistrano-unicorn-nginx
  no-configuration unicorn and nginx setup with sensible defaults
• capistrano-postgresql
  plugin that automates postgresql configuration and setup
• capistrano-rbenv-install
  would you like Capistrano to install rubies for you?
• capistrano-safe-deploy-to
  if you're annoyed that Capistrano does not create a deployment path for the app on the server (default /var/www/myapp), this is what you need!

Bug reports and pull requests

...are very welcome!

Thanks

@bruno- - for his capistrano-unicorn-nginx plugin on which this one is based.