Use variable to construct dictionary key in Ansible

TSG

1/11/23, 6:13 PM

I am trying to update a dict in a hostvar, and the name of the key is constructed using a variable (node). For example, if 'node' is 1 then I want to update hostvars['fakehost']['mydict']['localaddress1']. Here's my code:

- name: Read IPv4 of first interface
    add_host:
      name: "fakehost"
      telium: "{{ hostvars['fakehost']['mydict'] | combine ({ 'localaddress{{ node }}' : ansible_all_ipv4_addresses[0] }) }}"

I can't figure out how to construct localaddress{{node}} with ansible complaining about the syntax.

1064

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ansible

variables

Zeitounator

1/12/23, 4:06 PM

[mustaches don't stack](https://docs.ansible.com/ansible/latest/reference_appendices/faq.html#when-should-i-use-also-how-to-interpolate-variables-or-dynamic-variable-names)

Score:0

Server

flowerysong

1/11/23, 7:34 PM

Don't nest moustaches ({{ }}). Once you're inside an expression, you're already in a Jinja context and should not use additional delimiters when accessing a variable.

      telium: "{{ hostvars['fakehost']['mydict'] | combine ({ 'localaddress' ~ node: ansible_all_ipv4_addresses[0] }) }}

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Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Use variable to construct dictionary key in Ansible

TH: ใช้ตัวแปรเพื่อสร้างคีย์พจนานุกรมใน Ansible

RO: Utilizați variabila pentru a construi cheia de dicționar în Ansible

RU: Используйте переменную для создания ключа словаря в Ansible

VI: Sử dụng biến để tạo khóa từ điển trong Ansible

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