ansible - {{ ansible_hostname }} 在直接使用 Ansible 2.3 调用时不起作用

Question

有没有人在直接调用 playbook 任务时遇到过 "{{ ansible_hostname }}" 的以下问题？

请建议是否有其他方法可以做到这一点，或者如果我在这里做错了什么，我已经用 lineinfile 和 replace 模块尝试过:

---
- name: Playbook to Install CollectD
  hosts: servercast01
  gather_facts: False
  remote_user: root
  become: true
  tasks:
  - name: Replacing hostname entry
    lineinfile:
      dest: "/tmp/collectd/etc/collectd.conf"
      regexp: '#Hostname  "myvm01"'
      line: 'Hostname  "{{ ansible_hostname }}"'

2) 使用 replace 模块:

---
- name: Playbook to Install CollectD
  hosts: servercast01
  gather_facts: False
  remote_user: root
  become: true
  tasks:
  - name: Replacing hostname entry
    replace:
      dest: /tmp/collectd/etc/collectd.conf
      regexp: '#Hostname  "myvm01"'
      replace: 'Hostname  "{{ ansible_hostname }}"'
      backup: yes

Below is the error while executing the playbook..

fatal: [servercast01]: FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'ansible_hostname' is undefined\n\nThe error appears to have been in '/etc/ansible/lineinfile3.yml': line 10, column 5, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n  tasks:\n  - name: Replacing hostname entry\n    ^ here\n"}

Answer 1

ansible_hostname 是事实，并且您已明确禁用收集事实 (gather_facts: False)，因此未定义。

删除该行。