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Asked: 2016-09-28 03:48:11 +0800 CST

如何为 Ansible 中的变量分配空值？

  • 772

如果firewall_allowed_ports在：

- name: port {{ item }} allowed in firewall
  ufw:
    rule: allow
    port: "{{ item }}"
    proto: tcp
  with_items: 
    - 22
    - "{{ firewall_allowed_ports }}"

未定义，则发生此错误：

fatal: [host.example.com]: FAILED! => {"failed": true, "msg": "the field 'args' 
has an invalid value, which appears to include a variable that is undefined.

尝试解决问题

"{{ firewall_allowed_ports | }}"

结果是：

fatal: [host.example.com]: FAILED! => {"failed": true, "msg": "template error
while templating string: expected token 'name', got 'end of print statement'. 
String: {{ firewall_allowed_ports | }}"}
ansible

1 个回答

  1. Best Answer

    如果未定义，则用于default([])创建一个空列表。空时将跳过它firewall_allowed_ports。with_items

    - name: port {{ item }} allowed in firewall
  ufw:
    rule: allow
    port: "{{ item }}"
    proto: tcp
  with_items: 
    - 22
    - "{{ firewall_allowed_ports | default([]) }}"
    • 26

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