安装

gem install rufus-scheduler

ruby

#!/usr/bin/env ruby
require 'rubygems'
require 'rufus-scheduler'

scheduler = Rufus::Scheduler.new

scheduler.every '3s' do
  puts 'Hello... Rufus'
end

scheduler.join

rails

Gemfile里添加

gem "rufus-scheduler" # 定时器

执行命令
bundle install

新建文件
config/initializers/task.rb

ENV['RAILS_ENV'] = ARGV.first || ENV['RAILS_ENV'] || 'development'
require File.expand_path(File.dirname(__FILE__) + "/../environment")

require 'rubygems'
require 'rufus/scheduler'
scheduler = Rufus::Scheduler.singleton

scheduler.every("2s") do
  puts Time.now
  SendIpInfoWorker.perform_async(true)
end
scheduler.join

https://www.jianshu.com/p/14dc7797d5a8
https://github.com/jmettraux/rufus-scheduler