如何在jinja2模板中构建此循环

Question

我有以下ansible任务

---
- name: Add inventory hosts to hosts file
  template: src=hosts.j2 dest=/etc/hosts owner=root group=root mode=0644
  with_dict: hosts

和jinja模板看起来像这样

{% for host in hosts %}

{{ host }}{% for domain in item.value.domains %} {{ host }}.{{ domain }}{% endfor %}{% if item.value.alias is defined %}{% for domain in item.value.domains %} {{ item.value.alias }}.{{ domain }}{% endfor %}{% endif %}

{% endfor %}

主机dict的地方是

主机：

  'server1':
    domains:
      - 'com'
      - 'net'
    alias: 'opendj'
  'server2':
    domains:
      - 'org'
    alias: 'metadata'

我得到了

server1 server1.org metadata.org
server2 server2.org metadata.org

我应该怎样做才能达到正确的状态，即

server1 server1.com server1.net opendj.com opendj.net
server2 server2.org metadata.org

由于

Answer 1

看起来它会做你想做的事情：

{% for host in hosts %}
{{ host }} {% for d in hosts[host]['domains'] %} {{ host }}.{{ d }}{% endfor %} {% for d in hosts[host]['domains'] %} {{ hosts[host]['alias'] }}.{{ d }}{% endfor %}

{% endfor %}

或者，如果你想要一个稍微漂亮的版本：

{% for host in hosts %}
{{ host -}}
{% for d in hosts[host]['domains'] %} {{ host }}.{{ d }}{% endfor -%}
{% for d in hosts[host]['domains'] %} {{ hosts[host]['alias'] }}.{{ d }}{% endfor %}
{% endfor %}

-和{{ host -}}语句末尾的{% endfor -%}将取消在其他位置发生的跟踪换行符。

如果您只想在定义alias时打印出别名：

{% for host in hosts %}
{{ host -}}
{% for d in hosts[host]['domains'] %} {{ host }}.{{ d }}{% endfor -%}
{% if hosts[host]['alias'] is defined %}
{% for d in hosts[host]['domains'] %} {{ hosts[host]['alias'] }}.{{ d }}{% endfor %}
{% endif %}

{% endfor %}