问题与鲁弗斯，调度，当我们有多个EC2实例 [英] Issue with rufus-scheduler when we have multiple EC2 instances

问题描述

我已经部署的Rails应用上的两个EC2实例。我已安排的作业与鲁弗斯，调度运行，每24小时发送一些电子邮件。

I have deployed rails app on two EC2 instances. I have scheduled on Job with rufus-scheduler to run every 24 hours to send some emails.

不过，调度器上的两个实例独立运行。

But scheduler is running separately on two instances.

我需要的只有一个实例运行调度。所以，你能帮这个问题？

I need run scheduler on only one instance. So can you please help with this issue?

感谢

推荐答案

让我们假设你遵循的 https://github.com/jmettraux/rufus-scheduler#so-rails

您可以修改初始化以这种方式：

You could modify the initializer in this way:

#
# config/initializers/scheduler.rb

require 'rufus-scheduler'

s = Rufus::Scheduler.singleton

unless File.exist?(File.dirname(__FILE__) + '/../../no_scheduling')

  s.every '1m' do
    Rails.logger.info "hello, it's #{Time.now}"
  end
end

然后，在你不想来安排实例的Rails的根，只需触摸no_scheduling文件，然后启动你的Rails。着有no_scheduling文件的情况下，也不会安排。

Then in the Rails root of the instance you don't want to schedule, simply touch the no_scheduling file, then start your Rails. The instances with a "no_scheduling" file will not schedule.

练习1：增强的上方，使得它甚至不实例化调度，如果no_scheduling是present初始化

Exercise 1: enhance the initializer above so that it doesn't even instantiate the scheduler if no_scheduling is present.

练习2：通过IP检查替换文件检查，这样只对指定的IP调度导轨安装

Exercise 2: replace the file check by an IP check so that only the rails setup on a given IP schedules.

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