ansible动态主机拒绝使用自定义解释器

Question

我正在尝试使用ec2模块在AWS上配置新计算机并在本地更新我的主机文件，以便下一个任务已经使用hosts文件。

因此，配置不是问题，甚至是本地主机文件的创建：

- name: Provision a set of instances
      ec2:
         key_name: AWS
         region: eu-west-1
         group: default
         instance_type: t2.micro
         image: ami-6f587e1c # For Ubuntu 14.04 LTS use ami-b9b394ca # For Ubuntu 16.04 LTS use ami-6f587e1c
         wait: yes
         volumes:
          - device_name: /dev/xvda
            volume_type: gp2
            volume_size: 50
            wait: true
         count: 2
         vpc_subnet_id: subnet-xxxxxxxx
         assign_public_ip: yes
         instance_tags:
            Name: Ansible
      register: ec2

    - name: Add all instance private IPs to host group
      add_host:
          hostname: "{{ item.private_ip }}"
          ansible_ssh_user: ubuntu
          groups: aws
      with_items: "{{ ec2.instances }}"

    - local_action: file path=./hosts state=absent
      ignore_errors: yes

    - local_action: file path=./hosts state=touch

    - local_action: lineinfile line="[all]" insertafter=EOF dest=./hosts

    - local_action: lineinfile line="{{ item.private_ip }}  ansible_python_interpreter=/usr/bin/python3" insertafter=EOF dest=./hosts
      with_items: "{{ ec2.instances }}"

    - name: Wait for SSH to come up
      wait_for:
          host: "{{ item.private_ip }}"
          port: 22
          delay: 60
          timeout: 600
          state: started
      with_items: "{{ ec2.instances }}"

    - name: refreshing inventory cache
      meta: refresh_inventory

- hosts: all
  gather_facts: False
  tasks:
    - command: hostname -i

然而，下一个主题名为-i（仅用于测试）的简单打印任务失败，因为它无法在Ubuntu 16.04上找到LTS Python 2.7（有python3）为此，在我的动态主机文件中添加以下行：

ansible_python_interpreter=/usr/bin/python3

但似乎ansible忽略了它并直接转向缺少的python 2.7。

我试图重新加载库存文件

meta: refresh_inventory

但这也没有帮助。我究竟做错了什么 ？

Answer 1

我不确定为什么刷新不起作用但我建议在add_host部分设置它，它需要任何变量。

- name: Add all instance private IPs to host group
  add_host:
      hostname: "{{ item.private_ip }}"
      ansible_ssh_user: ubuntu
      groups: aws
      ansible_python_interpreter: "/usr/bin/python3"
  with_items: "{{ ec2.instances }}"

此外，我发现使用此任务进行调试很有用

- debug: var=hostvars[inventory_hostname]