每次再操作节点进行系统的一些软件包更新时，由于存在ubuntu和centos系统，所以需要对系统判断来使用包管理器，每当后续有些操作需要就要写如下内容，繁琐。。。

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when: ansible_os_family == 'RedHat'

正好最近浏览到ansible可以将任务合成为一个任务组，对组进行判断即可满足我的需求

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---
- hosts: all
  tasks:
    #Install and configure Apache on RHEL/CentOS hosts. 
    - block:
        - yum: name=httpd state=present
        - template: src=httpd.conf.j2 dest=/etc/httpd/conf/httpd.conf 
        - service: name=httpd state=started enabled=yes
      when: ansible_os_family == 'RedHat'
      become: yes

    #Install and configure Apache on Debian/Ubuntu hosts. 
    - block:
        - apt: name=apache2 state=present
        - template: src=httpd.conf.j2 dest=/etc/apache2/apache2.conf 
        - service: name=apache2 state=started enabled=yes
      when: ansible_os_family == 'Debian' 
      become: yes