仅运行特定组中盒子上的 Ansible 任务

Question

我正在尝试创建一个任务，该任务只会运行在特定组（称为 pi）中的盒子上。

我使用的是 Ansible 版本：

ansible 2.3.2.0
  config file = /Users/user/Development/raspbian-homeassistant/ansible.cfg
  configured module search path = Default w/o overrides
  python version = 3.6.3 (default, Dec  3 2017, 10:37:53) [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.38)]

这是我当前的代码：

- name: Set up zwave USB dongle
  when: inventory_hostname in groups['pi']
  blockinfile:
    path: /var/local/homeassistant/.homeassistant/configuration.yaml
    marker: "# {mark} ANSIBLE MANAGED BLOCK #"
    insertafter: "# zwave dongle"
    content: |2
      zwave:
        usb_path: /dev/ttyACM0
  tags:
    - config
    - hass

当主机名在组中时似乎可以正常工作，但如果不在组中则会抛出错误。

这是我在我的 vagrant box 上运行时得到的错误（在组 vagrant 中）：

fatal: [192.168.33.123]: FAILED! => {"failed": true, "msg": "The conditional check 'inventory_hostname in groups['pi']' failed. The error was: error while evaluating conditional (inventory_hostname in groups['pi']): Unable to look up a name or access an attribute in template string ({% if inventory_hostname in groups['pi'] %} True {% else %} False {% endif %}).\nMake sure your variable name does not contain invalid characters like '-': argument of type 'StrictUndefined' is not iterable\n\nThe error appears to have been in '/Users/andy/Development/raspbian-homeassistant/ansible/roles/configure-hass/tasks/main.yml': line 21, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Set up zwave USB dongle\n  ^ here\n"}

表明我的语法正确，但我猜这是针对旧版本的 Ansible？

我该如何解决这个问题？

Answer 1

通常，如果您希望任务仅适用于特定组中的主机，您可以通过创建一个针对该组的游戏来实现：

- hosts: pi
  tasks:
    - name: Set up zwave USB dongle
      blockinfile:
        path: /var/local/homeassistant/.homeassistant/configuration.yaml
        marker: "# {mark} ANSIBLE MANAGED BLOCK #"
        insertafter: "# zwave dongle"
        content: |2
          zwave:
            usb_path: /dev/ttyACM0
      tags:
        - config
        - hass

你得到的错误是因为组['pi']is undefined. There are a couple of ways of preventing the error. For example, you can explicitly check that组['pi']`在尝试使用它之前被定义:

- name: set up zwave USB dongle
  when: groups['pi'] is defined and inventory_hostname in groups['pi']

或者您可以使用 default 过滤器提供默认值：

- name: set up zwave USB dongle
  when: inventory_hostname in groups['pi']|default([])

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