Lennakim

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在rails中创建定时任务

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whenever

安装 运行

1 gem “whenever”, “~> 0.8.4”

2 在命令行输入 wheneverize .

生成config/schedule.rb

3 编写 schedule.rb

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env :PATH, ENV['PATH']
set :output, {:error => File.join(Whenever.path, "log", "cron_err.log"), :standard =>File.join(Whenever.path, "log", "cron_out.log")}
set :environment, 'development'

4 执行

whenever #根据schedule.rb 转换成cron语法, 不会写入crontab文件

whenever --update-crontab #写入crontab文件

whenever -s environment=development -w ~/minsheng/config/schedule.rb

whenever --help

linux crontab 命令

crontab -l # 列出某个用户cron服务的详细内容
crontab -e # 修改
crontab -r # 删除某个用户的cron服务

schedule.rb 示例

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every 3.hours do
  runner "MyModel.some_process"
  rake "my:rake:task"
  command "/usr/bin/my_great_command"
end

every 1.day, :at => '4:30 am' do
  runner "MyModel.task_to_run_at_four_thirty_in_the_morning"
end

every :hour do # Many shortcuts available: :hour, :day, :month, :year, :reboot
  runner "SomeModel.ladeeda"
end

every :sunday, :at => '12pm' do # Use any day of the week or :weekend, :weekday
  runner "Task.do_something_great"
end

every '0 0 27-31 * *' do
  command "echo 'you can use raw cron syntax too'"
end

# run this task only on servers with the :app role in Capistrano
# see Capistrano roles section below
every :day, :at => '12:20am', :roles => [:app] do
  rake "app_server:task"
end

定义自己的工作类型

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job_type :awesome, '/usr/local/bin/awesome :task :fun_level'

every 2.hours do
  awesome "party", :fun_level => "extreme"
end

whenever 默认的工作类型与定义

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job_type :command, ":task :output"
job_type :rake,    "cd :path && :environment_variable=:environment bundle exec rake :task --silent :output"
job_type :runner,  "cd :path && script/rails runner -e :environment ':task' :output"
job_type :script,  "cd :path && :environment_variable=:environment bundle exec script/:task :output"

RVM 集成

…

Capistrano 集成

…

资料

What is Cron

Rake + cronjob 创建计划任务

164-cron-in-ruby