Comment puis-je utiliser une variable imbriquée Ansible?

Question

J'ai un PlayBook Ansible comme celui ci-dessous, je veux utiliser la variable imbriquée comme ceci: msg={{{{Component}}.community_release_num}}, mais quand je lance PlayBook:

ansible-playbook vartest.yml -e 'version=version_402', it not work 

[es@vpn-server nested-var]$ tree 
. 
├── vars 
│   ├── horizon.yml 
│   └── version_402.yml 
└── vartest.yml 

1 directory, 3 files 
[es@vpn-server nested-var]$ cat vartest.yml 
--- 

- name: test 
    hosts: localhost 
    vars_files: 
    - vars/{{version}}.yml 
    tasks: 
    - debug: msg={{{{Component}}.community_release_num}} 
    - debug: msg={{{{Component}}.release_num}} 

[es@vpn-server nested-var]$ cat vars/horizon.yml 
Component: horizon 

[es@vpn-server nested-var]$ cat vars/version_402.yml 
- horizon: 
    community_release_num: '9.0.1' 
    release_num: '4.0.2' 
[es@vpn-server nested-var]$ 

messages d'erreur

[es@vpn-server nested-var]$ ansible-playbook vartest.yml -e 'version=version_402' 
/usr/lib64/python2.6/site-packages/cryptography/__init__.py:25: DeprecationWarning: Python 2.6 is no longer supported by the Python core team, please upgrade your Python. 
    DeprecationWarning 

PLAY [test] ******************************************************************************************************* 
/usr/lib64/python2.6/site-packages/Crypto/Util/number.py:57: PowmInsecureWarning: Not using mpz_powm_sec. You should rebuild using libgmp >= 5 to avoid timing attack vulnerability. 
    _warn("Not using mpz_powm_sec. You should rebuild using libgmp >= 5 to avoid timing attack vulnerability.", PowmInsecureWarning) 

TASK [debug] ****************************************************************************************************** 
fatal: [localhost]: FAILED! => {"failed": true, "msg": "template error while templating string: expected token 'colon', got '}'. String: {{{{Component}}.community_release_num}}"} 
    to retry, use: --limit @/data/wangqian/artemis-code-test/artemis/ansible/update/nested-var/vartest.retry 

PLAY RECAP ******************************************************************************************************** 
localhost     : ok=0 changed=0 unreachable=0 failed=1 

Peut variable emboîtée utiliser Ansible , si oui, comment l'utiliser?

Answer 1

par Ansible FAQ:

Une autre règle est «ne se cumulent pas les moustaches. Nous voyons souvent ceci:

{{ somevar_{{other_var}} }} 

ci-dessus ne fonctionne pas, si vous avez besoin d'utiliser une variable dynamique utiliser les hostvars ou vars dictionnaire selon le cas:

{{ hostvars[inventory_hostname]['somevar_' + other_var] }} 

Donc dans votre cas:

- debug: msg={{hostvars[inventory_hostname][Component].community_release_num}} 

Ou

- debug: msg={{vars[Component].community_release_num}}