Ansible 日期变量

Question

我正在尝试学习如何使用 Ansible 事实作为变量，但我不明白。当我运行时...

$ ansible localhost -m setup

...它列出了我的系统的所有事实。我随机选择了一个来尝试使用它，ansible_facts.ansible_date_time.date，但我不知道如何使用它。当我运行时...

$ ansible localhost -m setup -a "filter=ansible_date_time"
localhost | success >> {
    "ansible_facts": {
        "ansible_date_time": {
            "date": "2015-07-09",
            "day": "09",
            "epoch": "1436460014",
            "hour": "10",
            "iso8601": "2015-07-09T16:40:14Z",
            "iso8601_micro": "2015-07-09T16:40:14.795637Z",
            "minute": "40",
            "month": "07",
            "second": "14",
            "time": "10:40:14",
            "tz": "MDT",
            "tz_offset": "-0600",
            "weekday": "Thursday",
            "year": "2015"
        }
    },
    "changed": false
}

所以，它显然就在那里。但是当我运行时...

$ ansible localhost -a "echo {{ ansible_facts.ansible_date_time.date }}"
localhost | FAILED => One or more undefined variables: 'ansible_facts' is undefined

$ ansible localhost -a "echo {{ ansible_date_time.date }}"
localhost | FAILED => One or more undefined variables: 'ansible_date_time' is undefined

$ ansible localhost -a "echo {{ date }}"
localhost | FAILED => One or more undefined variables: 'date' is undefined

我在这里没有得到什么？如何使用事实作为变量？

Answer 1

命令 ansible localhost -m setup 基本上表示“针对 localhost 运行安装模块”，安装模块会收集您在输出中看到的事实。

当您运行 echo 命令时，这些事实不存在，因为安装模块未运行。测试此类事情的更好方法是使用 ansible-playbook 来运行如下所示的 playbook:

- hosts: localhost
  tasks:
      - debug: var=ansible_date_time

      - debug: msg="the current date is {{ ansible_date_time.date }}"

因为这是作为剧本运行的，所以在运行任务之前会收集本地主机的事实。上述剧本的输出将是这样的:

PLAY [localhost] **************************************************

GATHERING FACTS ***************************************************************
ok: [localhost]

TASK: [debug var=ansible_date_time] *******************************************
ok: [localhost] => {
    "ansible_date_time": {
        "date": "2015-07-09",
        "day": "09",
        "epoch": "1436461166",
        "hour": "16",
        "iso8601": "2015-07-09T16:59:26Z",
        "iso8601_micro": "2015-07-09T16:59:26.896629Z",
        "minute": "59",
        "month": "07",
        "second": "26",
        "time": "16:59:26",
        "tz": "UTC",
        "tz_offset": "+0000",
        "weekday": "Thursday",
        "year": "2015"
    }
}

TASK: [debug msg="the current date is {{ ansible_date_time.date }}"] **********
ok: [localhost] => {
    "msg": "the current date is 2015-07-09"
}

PLAY RECAP ********************************************************************
localhost      : ok=3    changed=0    unreachable=0    failed=0