如何将一组任务分组到一个可用的剧本块中？

Question

我正在创建一个用于配置构建系统的ansible playbook.部分原因是我开始为CentOS编写安装java(开放JDK和Oracle JDK)的角色.通过YUM包管理器可以打开JDK,因此在那里没有幂等问题.对于oracle Java,我需要下载,安装,符号链接和清理.为了创造幂等性,我正在寻找更简洁的方法,例如这里是我的代码.基本上我正在检查符号链接以确定是否安装了java,并注册一个变量以便稍后在WHEN模块中使用它.我不喜欢的是在安装jdk的所有四个步骤中使用When语句.如何将所有四个步骤(下载,安装,符号链接和清理)分组到一个块中,并根据一个when语句使它们全部运行？

- name: Check if Java 8 is instaled
  stat: path=~/java/oraclejdk8
  register: oraclejdk8_sym

- name: Download Java 8
  command: "wget --no-cookies -O {{ jdk_download_path }}/{{ oraclejdk8.jdk_rpm_file }} --no-check-certificate --header 'Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie' {{ oraclejdk8.jdk_rpm_url }}"
  when: oraclejdk8_sym.stat.islnk is not defined

- name: Install Java 8
  yum: name={{ java_archive }} state=present
  when: oraclejdk8_sym.stat.islnk is not defined

- name: Symlink to ~/java/oraclejdk8
  file: path=~/java/ state=directory mode=0755
  command: "ln -s /usr/java/jdk{{ oraclejdk8.jdk_version  }} ~/java/oraclejdk8"
  when: oraclejdk8_sym.stat.islnk is not defined

- name: Clean up
  file: state=absent path={{ jdk_download_path}}/{{ oraclejdk8.jdk_rpm_file }}
  when: oraclejdk8_sym.stat.islnk is not defined

Answer 1

在Ansible 2.x中,你可以这样做:

- name: Check if Java 8 is instaled
  stat: path=~/java/oraclejdk8
  register: oraclejdk8_sym

- block:   
    - name: Download Java 8
      command: "wget --no-cookies -O {{ jdk_download_path }}/{{ oraclejdk8.jdk_rpm_file }} --no-check-certificate --header 'Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie' {{ oraclejdk8.jdk_rpm_url }}"

    - name: Install Java 8
      yum: name={{ java_archive }} state=present

    - name: Symlink to ~/java/oraclejdk8
      file: path=~/java/ state=directory mode=0755
    - command: "ln -s /usr/java/jdk{{ oraclejdk8.jdk_version  }} ~/java/oraclejdk8"


    - name: Clean up
      file: state=absent path={{ jdk_download_path}}/{{ oraclejdk8.jdk_rpm_file }}

  when: oraclejdk8_sym.stat.islnk is not defined