在 ansible 中，如何连接设置文件 yaml 中已定义的变量和额外变量？

Question

I created a settings file called settings.yaml that looks like this:

cust_int: 'ens224'
cust_sub_int: '{{ cust_int }}.{{ cust }}

• cust_int, is the already defined variable above
• cust, Is a variable provided with --extra-var

here is the playbook:

- name: Include vars
  include_vars:
      file: ../../../settings.yaml
      name: settings

- debug: msg="{{ settings.cust_sub_int }}"

When trying to concatenate this way I get unclear error that the playbook "did not find the expected key".

My question is, how can I combine these two variables in my settings file? I dont want to have to use set_fact in all my playbooks.

Answer 1

See ansible cannot use variable to learn details why this is not working. The solution is rather simple. Split the settings into common variables and the dictionary. For example,

shell> cat settings-common.yaml
_cust_int: 'ens224'

shell> cat settings.yaml
cust_int: '{{ _cust_int }}'
cust_sub_int: '{{ _cust_int }}.{{ cust }}'

Include both files

    - include_vars:
        file: settings-common.yaml
    - include_vars:
        file: settings.yaml
        name: settings

Running the play with extra var cust=foo gives the expected result

  settings:
    cust_int: ens224
    cust_sub_int: ens224.foo

Example of a complete project for testing

shell> tree. . ├── ansible.cfg ├── hosts ├── pb.yml ├── settings-common.yaml └── settings.yaml 0 directories, 5 files

 shell> cat ansible.cfg [defaults] gathering = explicit inventory = $PWD/hosts retry_files_enabled = false stdout_callback = yaml

 shell> cat hosts localhost

 shell> cat pb.yml - hosts: localhost tasks: - include_vars: file: settings-common.yaml - include_vars: file: settings.yaml name: settings - debug: var: settings - debug: msg: "{{ settings.cust_sub_int }}"

gives

shell> ansible-playbook pb.yml -e cust=foo PLAY [localhost] ***************************************************************************************************************** TASK [include_vars] ************************************************************************************************************** ok: [localhost] TASK [include_vars] ************************************************************************************************************** ok: [localhost] TASK [debug] ********************************************************************************************************************* ok: [localhost] => settings: cust_int: ens224 cust_sub_int: ens224.foo TASK [debug] ********************************************************************************************************************* ok: [localhost] => msg: ens224.foo PLAY RECAP *********************************************************************************************************************** localhost: ok=4 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0