在多个任务中注册 ansible 变量

Question

我在 ansible 脚本中使用以下任务，该脚本在各种服务器上安装更新。这些任务适用于 CentOS 机器：

- name: Check for outstanding reboot
  shell: needs-restarting > /dev/null || echo Reboot required
  when: ansible_distribution_major_version|int < 7
  register: result
- name: Check for outstanding reboot
  shell: needs-restarting -r > /dev/null || echo Reboot required
  when: ansible_distribution_major_version|int >= 7
  register: result
- name: Report reboot
  debug: msg="{{ result.stdout_lines }}"

结果：

TASK [Check for outstanding reboot] ***********************************************************************************
skipping: [host1]
skipping: [host2]
skipping: [host5]
changed: [host3]
changed: [host4]

TASK [Check for outstanding reboot] ***********************************************************************************
skipping: [host3]
skipping: [host4]
changed: [host2]
changed: [host1]
changed: [host5]

TASK [Report reboot] **************************************************************************************************
fatal: [host3]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'stdout_lines'\n\nThe error appears to have been in '/path/to/updates.yml': line 52, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n    register: result\n  - name: Report reboot\n    ^ here\n\nexception type: <class 'ansible.errors.AnsibleUndefinedVariable'>\nexception: 'dict object' has no attribute 'stdout_lines'"}
ok: [host1] => {
    "msg": [
        "Reboot required"
    ]
}
fatal: [host4]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'stdout_lines'\n\nThe error appears to have been in '/path/to/updates.yml': line 52, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n    register: result\n  - name: Report reboot\n    ^ here\n\nexception type: <class 'ansible.errors.AnsibleUndefinedVariable'>\nexception: 'dict object' has no attribute 'stdout_lines'"}
ok: [host2] => {
    "msg": [
        "Reboot required"
    ]
}
ok: [host5] => {
    "msg": [
        "Reboot required"
    ]
}
        to retry, use: --limit @/path/to/updates.retry

正如您所看到的，两个检查任务都将结果存储在一个名为“result”的变量中，但仅ansible_distribution_major_version|int >= 7填充了第二个任务中主机的变量（带有），从而导致错误消息。似乎第二个检查任务取消了前一个任务的结果。

是否可以保留两个任务的结果？或者我是否必须复制报告任务并将版本检查添加到两者中？我宁愿把报告放在一个地方。

Ansible 版本是 2.4.4.0

Answer 1

发生这种情况是因为即使任务被跳过，Ansible 也会存储结果：

如果任务失败或被跳过，变量仍以失败或跳过状态注册，避免注册变量的唯一方法是使用标签。

有关注册变量的 Ansible 用户指南

因此，不可能保留这两项任务的结果。

正如您已经建议的那样，我会复制报告任务并向两者添加版本检查。