"{{ ansible_hostname }}"有没有人在直接调用剧本任务时遇到以下问题？
请建议是否有其他方法可以做到这一点，或者我在这里做错了什么，我已经用lineinfile&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) 带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
以下是执行剧本时的错误..
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"}