Skip to main content

Rails crontab with “whenever” gem ?

Rails crontab with “whenever” gem ?

Introduction

gem “whenever“  provides you with the valid cronjob syntax and also writes / updates the crontab file for you.

Installation

1.  Install the gem

gem install whenever

2. Add below line to your config/environment.rb

config.gem ‘whenever’, :lib=>false, :source=>’http://gemcutter.org’

3.  Go to your application root directory and run the below command

wheneverize .

   This will create a “config/schedule.rb” file for you.

  EXAMPLE “config/schedule.rb”

  set :environment, :development

  set :path, "/var/www/MyApp"

  # Scheduled Hourly

   every 4.hours do
   command "/usr/bin/your_command"
   end

  # Scheduled Daily

   every 1.day, :at => '12:00 am' do
   runner "MyModel.yourmethod"
   end

   # Scheduled Weekly

   every :monday, :at => '11:00 pm' do
   rake   "your:rake:task"
   end

Consider the above as the contents of your config/schedule.rb file.

4.  Now from application root directory, run the below command

whenever

The above command will output valid syntax for the crontab as below.

 0 0 * * * /var/www/MyApp/script/runner -e development “Model.your_method”

 0 0,4,8,12,16,20 * * * /usr/bin/your_command

 0 23 * * 1 cd /var/www/MyApp && RAILS_ENV=development /usr/bin/env rake your:rake_task


5. Now, To write the above content in your Crontab file run the below command.

whenever –update-crontab

you can see the above entries in your crontab file by running “crontab -e”.

That’s it, you are ready to go.

Comments

Popular posts from this blog

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).?

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).) In rails?


1)change the gemfile in mysql version
 gem 'mysql2'

2)Change to mysql2 version
 gem 'mysql2','0.3.20'

Active Scaffold : Add radio buttons to your form ruby on rails ?

Active Scaffold : Add radio buttons to your form ruby on rails ?

The way to add radio buttons to your active scaffold create/update from is as shown below

#Controller

class UsersController < ApplicationController
active_scaffold :user do |config|
config.label = “Users”
config.columns = [:name, :gender]
config.columns[:gender].form_ui = :radio
config.columns[:gender].options[:options] = [['Male', '1'], ['Female','2']]
end
end

Get user accessing ip address in rails?

Get user accessing ip address rails?

request.ip ->returns the ip, whether is is a local proxy ip (localhost address) or not.
*request.remote_ip -> is smarter and gets the ip address of the client outside of local proxies.
3)If you are using apache in front of a mongrel, then remote_ip will return the source address of the request, which in this case will be local host because the Apache web server is making the request, so instead put this in your controller:

@remote_ip = request.env["HTTP_X_FORWARDED_FOR"]