Keep Ansible DRY:如何避免重复变量？

Question

最近刚开始使用Ansible,我遇到了一个问题.在我的一个YAML结构中,我定义了这样的东西:

---
# file: main.yml
#
# Jenkins variables for installation and configuration

jenkins:
  debian:
    # Debian repository containing Jenkins and the associated key for accessing the repository
    repo: 'deb http://pkg.jenkins-ci.org/debian binary/'
    repo_key: 'http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key'

    # Dependencies needed for Jenkins to run properly
    dependencies:
      - 'openjdk-7-jdk'
      - 'git-core'
      - 'curl'

  port: 8080

  # Installation directory
  home: '/opt/jenkins'

  # Path to the location of the main Jenkins-cli binary
  bin_path: '{{jenkins.home}}/jenkins-cli.jar'

  # Path to the location of the Jenkins updates file
  updates_path: '{{jenkins.home}}/updates_jenkins.json'

Ansible从特定任务中给出了这样的错误:

"在模板字符串中检测到递归循环:{{jenkins.home}}/updates_jenkins.json"

我把它缩小到了问题,因为bin_path和updates_path都引用了'home'.有没有解决的办法？有点糟糕,我需要多次定义'/ opt/jenkins'.

Answer 1

据我所知，这是 jinja2 变量的限制。它使用旧的 ${} 并且从 1.4 开始就坏了。我不确定他们是否在 1.5 中修复了这个问题。

我的临时解决方案是从“詹金斯”中移除家

---
# file: main.yml
#
# Jenkins variables for installation and configuration

# Installation directory
jenkins_home: '/opt/jenkins'
jenkins:
  debian:
    # Debian repository containing Jenkins and the associated key for accessing the repository
    repo: 'deb http://pkg.jenkins-ci.org/debian binary/'
    repo_key: 'http://pkg.jenkins-ci.org/debian/jenkins-ci.org.key'

    # Dependencies needed for Jenkins to run properly
    dependencies:
      - 'openjdk-7-jdk'
      - 'git-core'
      - 'curl'

  port: 8080



  # Path to the location of the main Jenkins-cli binary
  bin_path: '{{jenkins_home}}/jenkins-cli.jar'

  # Path to the location of the Jenkins updates file
  updates_path: '{{jenkins_home}}/updates_jenkins.json'