更新事实模块ansible

Question

我用 set_fact 创建了一个字典。现在我只想用 update_fact 模块更新值“dnu”。

"PortRCR": [
        {
            "desc": null,
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet0/0",
            "os": "down"
        },
        {
            "desc": "Router",
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet1/0/1",
            "os": "up"
        },
        {
            "desc": null,
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet1/0/10",
            "os": "down"

我的剧本是这样的：

      set_fact:
        PortRCR: "{{ PortRCR + [{'name': item.key, 'desc': item.value.description, 'lp': item.value.lineprotocol | default('down', true), 'os': item.value.operstatus, 'dnu': '' | default('0', true) }] }}"
        PortRCR_length: "{{ PortRCR | length }}"
        cacheable: yes
      loop: "{{ ansible_net_interfaces | dict2items }}"
      vars:
        PortRCR: []

    - name: Update the fact
      ansible.utils.update_fact:
        updates:
        - path: PortRCR{{ item }}['dnu']
          value: "1"
      loop: "{{ range(0, PortRCR_length|int)|list }}"

Ansible 告诉我事实已更改但值未受影响。

Answer 1

如果您查看 the documentation for the update_fact module，您会注意到上面写着：

Variables are not modified in place, instead they are returned by the module.

并且所有示例都显示了使用 register 来捕获更新的值，例如：

- name: Update the fact
  ansible.utils.update_fact:
    updates:
    - path: a.b.c.0
      value: 10
    - path: "a['b']['c'][1]"
      value: 20
  register: updated

您需要向 update_fact 块添加 register 指令，但我们需要 post-process 返回值：因为您在循环，你将在 results 键中有多个结果（每个循环迭代一个）。

这似乎对我有用：

- hosts: localhost
  gather_facts: false
  tasks:
    # Here's the original fact as presented in your question
    - name: set portrcr fact
      set_fact:
        "PortRCR": [
          {
            "desc": null,
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet0/0",
            "os": "down"
          },
          {
            "desc": "Router",
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet1/0/1",
            "os": "up"
          },
          {
            "desc": null,
            "dnu": "0",
            "lp": "down",
            "name": "GigabitEthernet1/0/10",
            "os": "down"
          }]

    # We use update_fact to update the values and register
    # the results in the "updated" variable.
    - name: update portrcr fact
      ansible.utils.update_fact:
        updates:
          - path: "PortRCR[{{item}}].dnu"
            value: 1
      loop: "{{ range(PortRCR|length) }}"
      register: updated

    # The final iteration of the loop will contain all the changes,
    # so we want to replace the value of PortRCR with the value
    # from the final loop iteration.
    - set_fact:
        PortRCR: "{{ updated.results[-1].PortRCR }}"

    - debug:
        var: PortRCR

运行上面的剧本产生：

TASK [debug] ********************************************************************************************
ok: [localhost] => {
    "PortRCR": [
        {
            "desc": null,
            "dnu": 1,
            "lp": "down",
            "name": "GigabitEthernet0/0",
            "os": "down"
        },
        {
            "desc": "Router",
            "dnu": 1,
            "lp": "down",
            "name": "GigabitEthernet1/0/1",
            "os": "up"
        },
        {
            "desc": null,
            "dnu": 1,
            "lp": "down",
            "name": "GigabitEthernet1/0/10",
            "os": "down"
        }
    ]
}

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