Chef infra 厨师执行此食谱的命令

我有以下厨师食谱

lazy_message = 'Hello world'
file 'lazy_message' do
  path '/tmp/lazy.txt'
  content "#{lazy_message}"
end 

execute 'yum-makecache' do
  command 'yum makecache'
  notifies :create, 'file[message]', :immediately
  action :nothing
end

package 'bind-utils' do
  action :install
  notifies :run, 'execute[yum-makecache]', :before
end

file 'message' do
  path '/tmp/message.txt'
  content lazy { "#{lazy_message}" }
end

lazy_message = 'Goodbye world'

当我运行它时，它将按以下顺序执行

Synchronizing Cookbooks:
         - lcd_web (0.1.0)
       Installing Cookbook Gems:
       Compiling Cookbooks...
       Converging 4 resources
       Recipe: lcd_web::default
         * file[lazy_message] action create
           - create new file /tmp/lazy.txt
           - update content in file /tmp/lazy.txt from none to 64ec88
           --- /tmp/lazy.txt    2018-07-28 07:47:39.433257401 +0000
           +++ /tmp/.chef-lazy20180728-296-7usgw7.txt   2018-07-28 07:47:39.433257401 +0000
           @@ -1 +1,2 @@
           +Hello world
         * execute[yum-makecache] action nothing (skipped due to action :nothing)
         * yum_package[bind-utils] action install
           - install version 32:9.9.4-61.el7.x86_64 of package bind-utils
         * file[message] action create
           - create new file /tmp/message.txt
           - update content in file /tmp/message.txt from none to b4dabd
           --- /tmp/message.txt 2018-07-28 07:47:52.115780144 +0000
           +++ /tmp/.chef-message20180728-296-tgnjuk.txt    2018-07-28 07:47:52.115780144 +0000
           @@ -1 +1,2 @@
           +Goodbye world
         * execute[yum-makecache] action run
           - execute yum makecache
         * file[message] action create (up to date)

我不理解使用lazy block、：before和：立即指令的执行顺序

根据我的意见，执行命令如下

• 执行文件“惰性消息”
• 转到yum'makecache'，但由于无操作而跳过它
• 转到绑定utils，但由于：before指令再次跳转执行“yum-makecache”，并运行它

• 由于“yum-makecache”中的immediatelyn运行文件“message”

• 现在运行绑定utils
• 再次运行文件“消息”

---

但实际输出并不像“yum-makecache”之前运行的“bind-utils”

通知非常挑剔，基本上只用于在无法升级正在运行的服务的平台上进行包/文件更新之前停止服务。在计时之前再挂一次通知肯定会做一些不合逻辑的事情，我们不测试也不关心它的行为，因为我从来没有听说过这样做的真正原因。记住，Chef已经对订单敏感了，你不能使用
：在
强制执行订单之前，它只适用于那种升级情况