local_action:shell 错误连接文件 [英] local_action: shell error concatenate files

问题描述

我的剧本中有这样一个错误.为什么以及如何修复它?(获取远程主机的更新列表，将列表连接到一个文件中)

There is such an error in my playbook. Why and how to fix it? (getting the list of updates of remote-hosts, concatenate lists into one file)

- name: Save update_deb_packs in file on ansible-host
    copy:
      content: "{{ update_deb_packs.stdout }}"
      dest: ~/tmp/{{ inventory_hostname }}_update_deb_packs
    delegate_to: 127.0.0.1

- name: merge files from different hosts in once
    local_action: shell cat ~/tmp/* > ~/tmp/list_update

结果:

TASK [Save update_deb_packs in file on ansible-host] *******************************************
changed: [g33-linux -> 127.0.0.1]
changed: [dell-e6410 -> 127.0.0.1]

TASK [merge files from different hosts in once] ********************************
changed: [g33-linux -> localhost]
fatal: [dell-e6410 -> localhost]: FAILED! => {"changed": true, "cmd": "cat ~/tmp/* > ~/tmp/list_update", "delta": "0:00:00.052968", "end": "2017-12-23 13:48:37.029706", "msg": "non-zero return code", "rc": 1, "start": "2017-12-23 13:48:36.976738", "stderr": "cat: /home/alex/tmp/list_update: input and output in one file", "stderr_lines": ["cat: /home/alex/tmp/list_update: input and output in one file"], "stdout": "", "stdout_lines": []}
    to retry, use: --limit @/home/alex/.ansible/playbooks/update_deb_list.retry

目录 ~/tmp 为空.shell 结果文件 (list_update) 文件存在且为真后.

directory ~/tmp is empty. After shell result file (list_update) file exists and true.

推荐答案

您使用 glob ~/tmp/* 并且其中一个文件是 ~/tmp/list_update，因此您可以有效地命令它通过重定向读取和写入同一个文件，而系统拒绝这样做.

You use a glob ~/tmp/* and one of the files is ~/tmp/list_update, so effectively you order it to read and write to the same file with a redirection and system is refusing to do that.

您也没有指定 run_once，因此 一次合并来自不同主机的文件 任务将运行，因为有为播放定义的主机.

You also didn't specify run_once, so the merge files from different hosts in once task will run as there are hosts defined for the play.

如果您确定 ~/tmp/list_update 事先不存在，则向该任务添加 run_once: true 可以解决问题，但还差得很远以最好的方式.

If you are sure ~/tmp/list_update didn't exist beforehand, adding run_once: true to that task would resolve the problem, but it's far from the best way.

长话短说，例如，您可以在一项任务中实现您想要的

Long story short, you can achieve what you want in one task, for example

• 使用 Jinja2 模板:

• with a Jinja2 template:

- copy:
    content: "{% for host in ansible_play_hosts %}{{ hostvars[host].update_deb_packs.stdout }}\n{% endfor %}"
    dest: ~/tmp/list_update
  delegate_to: localhost
  run_once: true

您可以使用 host-value 添加分隔符以指示哪些数据来自哪个主机:

You can add separators with host-value to indicate what data is coming from which host:

content: "{% for host in ansible_play_hosts %}From host: {{ host }}\n{{ hostvars[host].update_deb_packs.stdout }}\n{% endfor %}"

在列表上使用操作:

using operations on lists:

content: "{{ ansible_play_hosts | map('extract', hostvars, 'update_deb_packs') | map(attribute='stdout') | list }}"

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