Question

Ansible.com上的这篇文章展示了如何在模板文件中迭代一个组：https://support.ansible.com/hc/en-us/articles/201957887-How-to-loop-over-a-list-of-hosts-in-a-group-inside-of-a-template-

它显示以下代码：

{% for host in groups['db_servers'] %}
   {{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{% endfor %}

它运行得很漂亮，但是我要迭代的服务器是通过多个组来定义的。所以想象一下，我想迭代db_servers和qa组中的所有服务器。我怎么能这样做？

我尝试以与我在剧本中相同的方式指定组的交集，但这不起作用。所以，当我尝试：

{% for host in groups['db_servers:&qa'] %}
   {{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{% endfor %}

我收到以下错误：

fatal: [54.173.247.115] => {'msg': "AnsibleUndefinedVariable: One or more undefined variables: 'dict object' has no attribute 'db_servers:&qa'", 'failed': True}

有关如何在模板文件中迭代多个组的任何建议吗？

Answer 1

Ansible有intersect过滤器。请参阅Set Theory Filters。

{% for host in groups['db_servers'] | intersect(groups['qa']) %}
   {{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{% endfor %}

Answer 2

您可以将循环包装在另一个服务器组中：

{% for svrs in ['db_servers', 'qa'] %}
  {% for host in groups[svrs] %}
    {{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
  {% endfor %}
{% endfor %}

在模板文件中迭代时有多个组

2 个答案: