Nginx Question posted in
The official documentation can be found here.

Nginx – Dynamically load environment variables from config file in Ansible

I have the following (simplified) play:

- hosts: testing

  roles:
     - nginx
  vars_files:
     - config.yml
  environment:
    http_proxy: http://proxy.example.com:8080

Now, when I run my code, I can read process.env.http_proxy. I would however like to be able to set other environment variables dynamically under environment. For example, in my config.yml I have the following:

application_variables:
  - key: "NODE_ENV"
    value: "production"
  - key: "PORT"
    value: "3000"

How would I get the values from application_variables to be dynamically created under environment? I’ve tried a few different solutions I found out there to no avail.

Tags:

2

Answers


  1. 0

    You can feed the environment parameter from a templated Jinja expression, in your case:

    environment: "{{ application_variables | items2dict }}"

    Then you have the choice to:

    • either add the HTTP proxy variable to your application_variables list: 
      application_variables:
  - key: http_proxy
    value: http://proxy.example.com:8080
  - key: NODE_ENV
    value: production
  - key: PORT
    value: 3000
    • or combine the dictionary created from the application_variables with a variable defined at the in your playbook: 
      - hosts: testing

  environment: >-
    {{ 
      default_env | combine(
        application_variables | items2dict
      )
    }}
  vars:
    default_env:
      http_proxy: http://proxy.example.com:8080

    As an example, the playbook:

    - hosts: localhost
  gather_facts: true

  environment: >-
    {{ 
      default_env | combine(
        application_variables | items2dict
      ) 
    }}
  vars_files: config.yml
  vars:
    default_env:
      http_proxy: http://proxy.example.com:8080

  tasks:
    - debug:
        msg:
          http_proxy: "{{ ansible_facts.env.http_proxy }}"
          NODE_ENV: "{{ ansible_facts.env.NODE_ENV }}"

    Would give you:

    ok: [localhost] => 
  msg:
    NODE_ENV: production
    http_proxy: http://proxy.example.com:8080
    Login or Signup to reply.
  2. 0

    Combine the environment

      env_static:
    http_proxy: http://proxy.example.com:8080
  env_dynamic: "{{ application_variables | items2dict }}"
  env: "{{ env_static | combine(env_dynamic) }}"

    gives

      env:
    NODE_ENV: production
    PORT: '3000'
    http_proxy: http://proxy.example.com:8080

    Import the role

        - import_role:
        name: nginx
      environment: "{{ env }}"

    For example, given the simplified role

    shell> cat roles/nginx/tasks/main.yml 
- command: echo $NODE_ENV $PORT $http_proxy
  register: out
- debug:
    var: out.stdout

    gives

      out.stdout: production 3000 http://proxy.example.com:8080

    Example of a complete playbook for testing

    - hosts: test

  vars_files:
    - config.yml

  vars:

    env_static:
      http_proxy: http://proxy.example.com:8080
    env_dynamic: "{{ application_variables | items2dict }}"
    env: "{{ env_static | combine(env_dynamic) }}"

  tasks:

    - debug:
        var: env

    - import_role:
        name: nginx
      environment: "{{ env }}"

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search