Ansible 节点列表中的项取决于主机组中主机的当前索引

我有下面的设置

groups_var/all.yml
---
cassandra_restore:
  nodes:
   - 192.168.0.1
   - 192.168.0.2
   - 192.168.0.3


inventory contains,

[just_created]
192.168.0.4
192.168.0.5
192.168.0.6


main.yml

---
# playbook 


- name: setup
  hosts: just_created
  remote_user: ubuntu
  become: true
  become_method: sudo
  gather_facts: yes
  vars:
     current_index: "{{ ansible_play_batch.index(inventory_hostname) }}"
  tasks:
    - debug:
       msg: "current host index: {{ ansible_play_batch.index(inventory_hostname) }} : {{ current_index }}"
    - debug:
       msg: "first target host: {{ cassandra_restore.nodes.0 }}"
    - name: get mapped value
      debug:
       msg: "current target host: {{ cassandra_restore.nodes.current_index }} "

我想根据刚刚创建的主机组中主机的当前索引访问节点列表中的项。 因此，当主机为192.168.0.4时，应打印192.168.0.1；当主机为192.168.0.5时，应打印192.168.0.2，依此类推

---

如何实现这一点？

您必须使用地图表单以动态索引或键进行访问：

- name: get mapped value
  debug:
    msg: "current target host: {{ cassandra_restore.nodes[current_index] }} "

但我不确定主机的顺序是确定的

---
# playbook for creating cassandra setup


- name: setup cassnadra
  hosts: just_created
  remote_user: ubuntu
  become: true
  become_method: sudo
  gather_facts: yes
  vars:
     current_index: "{{ ansible_play_batch.index(inventory_hostname) }}"
  tasks:
    - name: get mapped value
      debug:
        msg: "current_index current target host: {{ item.index }} : {{ item.host }} : {{ current_index }}  "
      when: current_index == item.index
      with_items:
        - "{{ cassandra_restore }}"

我用以下变量得到了这个结果

cassandra_restore:
  - { index: "0", host: 192.168.0.1 }
  - { index: "1", host: 192.168.0.2 }
  - { index: "2", host: 192.168.0.3 }

---

Thx的回复，但这给了我以下错误，“字段'args'有一个无效值，它似乎包括一个未定义的变量。”