当运行个带有标签的剧本时，Ansible 注册变量为空

Question

我想每 5 分钟运行在剧本上执行一个特定的复制任务。为此，我为该特定任务使用了标签，并使用 --tags 运行剧本。当我使用 --tags 选项时，注册变量（预任务）传递为空。

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

我在任务中使用“when”条件。如果没有注册的变量，任务将无法运行。

- 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 注册 st 和 colo 变量的地方。

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

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

当我运行带有 --tags 的剧本时，注册的变量被传递为空。

$ 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"}

当我运行没有标签的剧本时没有问题。变量注册成功，条件通过

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 }'", "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", "rc": 0, "start": "2020-09-10 03:53:50.539068", "stderr": "", "stderr_lines": [], **"stdout": "xx-server1.xx.test.com"**, "stdout_lines": ["xx-server1.xx.test.com"]}

我希望在运行使用 --tags 设置 playbook 时传递已注册的变量。

Answer 1

当您使用 --tags 时，只会执行具有这些标签的任务。那么您可以做的是：

给任务加上always标签，每次都要执行。他们将运行不管 --tags 和 --skip-tags.
为这些任务添加另一个标签，例如 config，并在您的命令中提供 --tags "xx-zone-files,config"。
将标签 xx-zone-files 添加到这些标签中。

因为看起来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 }'
  register: colo
  tags: always

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

当运行个带有标签的剧本时，Ansible 注册变量为空

Ansible registered variables are empty when running playbooks with tags

tags

ansible

ansible-facts

当 运行 个带有标签的剧本时，Ansible 注册变量为空

Ansible registered variables are empty when running playbooks with tags

tags

ansible

ansible-facts

当运行个带有标签的剧本时，Ansible 注册变量为空