简而言之：

- name: Get remote file content
  ansible.builtin.slurp:
    src: /tmp/somefile.txt
  register: somefile

- name: Append remote file content to a local file
  vars:
    target_file: /tmp/fetched.txt
  ansible.builtin.copy:
    content: |-
      {{ lookup('file', target_file) }}
      {{ somefile.content | b64decode }}
    dest: "{{ target_file }}"
  # Fix write concurrency when running on multiple targets
  throttle: 1
  delegate_to: localhost

注：

• 第二个任务不是幂等的（每次运行时都会修改文件，即使要追加的内容相同）
• 这适用于小的目标文件，如果文件变得很大，并且您遇到了很高的执行时间/内存消耗，您可能需要切换到shell来执行第二个任务：

- name: Append remote file content to a local file
  ansible.builtin.shell:
    cmd: echo "{{ somefile.content | b64decode }}" >> /tmp/fetched
  # You might still want to avoid concurrency with multiple targets
  throttle: 1
  delegate_to: localhost

或者，您可以一次性写入从所有目标获取的所有文件的所有内容，以避免并发问题并节省一些时间。

# Copy solution
- name: Append remote files contents to a local file
  vars:
    target_file: /tmp/fetched.txt
    fetched_content: "{{ ansible_play_hosts
      | map('extract', hostvars, 'somefile.content') 
      | map('b64decode')
      | join('\n') }}"
  ansible.builtin.copy:
    content: |-
      {{ lookup('file', target_file) }}
      {{ fetched_content }}
    dest: "{{ target_file }}"
  delegate_to: localhost
  run_once: true

# Shell solution
- name: Append remote files contents to a local file
  vars:
    fetched_content: "{{ ansible_play_hosts
      | map('extract', hostvars, 'somefile.content') 
      | map('b64decode')
      | join('\n') }}"
  ansible.builtin.shell:
    cmd: echo "{{ fetched_content }}" >> /tmp/fetched
  delegate_to: localhost
  run_once: true