使用标签运行剧本时，Ansible注册变量为空

问题描述

我想每5分钟在剧本上执行一次特定的复制任务。为此，我将tag用于该特定任务，并使用--tags运行该剧本。当我使用--tags选项时，已注册的变量（预任务）将空传递。

我的剧本

---
- name: DNS Master and Slave Configuration Playbook
  hosts: "{{ host }}"
  become: yes
  become_method: sudo
  gather_facts: no 
  connection: ssh

  pre_tasks:
    - include_tasks: pre_tasks/register_vars.yml
      tags: always

  roles:
    - role1
    - role2 (role with the tagged task)
    - role3

我在任务上使用“何时”条件。没有注册的变量，该任务将无法正常工作。

- name: Copy DNS zone files to the server
  copy:
    src: xx/xx-dns-zones/
    dest: /var/named/data/master/
    owner: named
    group: named
    mode: '0644'
  when: colo.stdout == 'xx' and 'server1' in fqdn.stdout
  notify: reload dns
  tags: xx-zone-files

这是我的pre_tasks，我在其中注册st和colo变量。

---
#pre_tasks
- name: To register colo of the server as variable
  shell: /usr/bin/hostname | /bin/awk -F'.' '{print $2}'
  register: colo

- name: To register fqdn of the server as vairble
  shell: /usr/bin/hostname
  register: fqdn

当我使用--tags来运行剧本时，注册变量将为空。

$ ansible-playbook dns-playbook.yml -e host=xx-server1 --tags "xx-zone-files"

PLAY [Test Playbook] ***************************************************************************************************

TASK [include_tasks] *********************************************************************************************************************************
Thursday 10 September 2020  10:25:21 +0000 (0:00:00.133)       0:00:00.133 **** 
included: /home/ansibleuser/ansible/pre_tasks/register_vars.yml for xx-server1

TASK [dns : Copy DNS zone files to the server] *******************************************************************************************************
Thursday 10 September 2020  10:25:21 +0000 (0:00:00.023)       0:00:00.156 **** 
fatal: [xx-server1]: FAILED! => {"msg": "The conditional check 'colo.stdout == 'xx' and 'server1' in fqdn.stdout' failed. The error was: error while evaluating conditional (colo.stdout == 'xx' and 'server1' in fqdn.stdout): 'colo' is undefined\n\nThe error appears to be in '/home/sselvaraj/test/click_ansible/roles/dns/tasks/main.yml': line 96,column 3,but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n# Copy XX DNS zone files\n- name: Copy DNS zone files to the server\n  ^ here\n"}

运行没有标签的剧本没有问题。变量已成功注册并通过了条件。

TASK [include_tasks] *********************************************************************************************************************************
Thursday 10 September 2020  10:53:49 +0000 (0:00:00.134)       0:00:00.134 **** 
included: /home/ansibleuser/ansible/pre_tasks/register_vars.yml for xx-server1

TASK [To register colo of the server as variable] ****************************************************************************************************
Thursday 10 September 2020  10:53:49 +0000 (0:00:00.021)       0:00:00.156 **** 
changed: [xx-server1] => {"ansible_facts": {"discovered_interpreter_python": "/usr/bin/python"},"changed": true,"cmd": "/usr/bin/hostname | /bin/awk -F'.' '{print $2}'","delta": "0:00:00.015379","end": "2020-09-10 03:53:50.374733","rc": 0,"start": "2020-09-10 03:53:50.359354","stderr": "","stderr_lines": [],**"stdout": "xx"**,"stdout_lines": ["xx"]}

TASK [To register fqdn of the server as vairble] *****************************************************************************************************
Thursday 10 September 2020  10:53:50 +0000 (0:00:00.481)       0:00:00.637 **** 
changed: [xx-server1] => {"changed": true,"cmd": "/usr/bin/hostname","delta": "0:00:00.014439","end": "2020-09-10 03:53:50.553507","start": "2020-09-10 03:53:50.539068",**"stdout": "xx-server1.xx.test.com"**,"stdout_lines": ["xx-server1.xx.test.com"]}

我希望在使用--tags运行剧本时传递注册变量。

解决方法

使用--tags时，仅执行具有那些标记的任务。因此，您可以执行以下操作：

• 将always标记添加到每次将要执行的任务中。它们将运行，而与--tags和--skip-tags无关。
• 在这些任务中添加另一个标签，例如config，并为--tags "xx-zone-files,config"提供命令。
• 将标签xx-zone-files添加到这些标签。

似乎这些变量应该总是被注册，我会选择选项一：

---
#pre_tasks
- name: To register colo of the server as variable
  shell: /usr/bin/hostname | /bin/awk -F'.' '{print $2}'
  register: colo
  tags: always

- name: To register fqdn of the server as vairble
  shell: /usr/bin/hostname
  register: fqdn
  tags: always