可靠的剧本，临时变量不能在两个主机之间使用

Question

无法设置和使用hostvars，在host1中声明了一个var，我想在localhost中使用它。我遵循了许多建议，但没有一个能解决错误The task includes an option with an undefined variable. The error was: "hostvars['host1']" is undefined

步骤为

• host1使用register通过fetch将文件复制到本地
• 然后使用set_fact将目标路径存储为包含主机("dest"："/var/log/assible_runs/10.xxx.xxx.251/tmp/xxxx_env_pin.tmp"(。这在host1下工作
• 下一个localhost使用var"；路径文件"；从host1创建(工作时将使用路径附加到另一个文件(

# Run script on remote machine
---
- hosts: host1
remote_user: one
tasks:
- name: Store file into local
fetch:
src: /tmp/xxx_env_one.tmp
dest: /var/log/ansible_runs
register: fetch_output1
- set_fact: file_n_path="{{fetch_output1.dest}}"
- debug: 
var: fetch_output1
- debug:
msg: " 1a. {{ file_n_path }}"

#   --/ Run on local machine to append copied file
- hosts: localhost
connection: local
vars:
m_var_frm_pin: "{{ hostvars['host1']['file_n_path'] }}"
tasks:
- debug: 
msg: " 2a. {{ m_var_frm_pin }}"

输出

PLAY [host1] *******************************************************************************************************************************************************************************************************************************
TASK [Gathering Facts gather_subset=['all'], gather_timeout=10] **************************************************************************************************************************************************************************
ok: [10.xxx.xxx.251]
TASK [Store file intolocal dest=/var/log/ansible_runs, src=/tmp/xxx_env_pin.tmp] *******************************************************************************************************************
ok: [10.xxx.xxx.251]
TASK [set_fact file_n_path={{fetch_output1.dest}}] ***************************************************************************************************************************************************************************************
ok: [10.xxx.xxx.251]
TASK [debug var=fetch_output1] ***********************************************************************************************************************************************************************************************************
ok: [10.xxx.xxx.251] => {
"fetch_output1": {
"changed": false,
"checksum": "dc828a5f0c48456c72e5849891736135f89b265c",
"dest": "/var/log/ansible_runs/10.xxx.xxx.251/tmp/xxx_env_pin.tmp",
"failed": false,
"file": "/tmp/xxx_env_pin.tmp",
"md5sum": "30a6d5ba55ed78832a978c53298a054c"
}
}
TASK [debug msg= 1a. {{ file_n_path }}] **************************************************************************************************************************************************************************************************
ok: [10.xxx.xxx.251] => {}
MSG:
1a. /var/log/ansible_runs/10.xxx.xxx.251/tmp/xxx_env_pin.tmp

PLAY [localhost] *************************************************************************************************************************************************************************************************************************
TASK [Gathering Facts gather_subset=['all'], gather_timeout=10] **************************************************************************************************************************************************************************
ok: [localhost]
TASK [debug msg= 2a. {{ m_var_frm_pin }}] ************************************************************************************************************************************************************************************************
fatal: [localhost]: FAILED! => {}
MSG:
The task includes an option with an undefined variable. The error was: "hostvars['host1']" is undefined
The error appears to be in '/etc/ansible/Playbook_033a.yml': line 26, column 7, but may
be elsewhere in the file depending on the exact syntax problem.
The offending line appears to be:
tasks:
- debug:
^ here

PLAY RECAP *******************************************************************************************************************************************************************************************************************************
10.xxx.xxx.251             : ok=5    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
localhost                  : ok=1    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0

Answer 1

回顾一下，特别是那些行ok: [10.xxx.xxx.251]，您的问题似乎是host1不是一个主机，而是一组主机。

如果要通过组名称访问组中单个主机的hostvars，可以使用hostvars[groups['group_name'][0]]['var_name']。

所以你当地的部分应该是：

- hosts: localhost
connection: local
vars:
m_var_frm_pin: "{{ hostvars[groups['host1'][0]]['file_n_path'] }}"
tasks:
- debug: 
msg: " 2a. {{ m_var_frm_pin }}"