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Ansible Convert List to String


I noticed many users are using different and wrong methods to convert a list data to string format. You can use existing filters and functions in Ansible to achieve the same.

Here is our list

  vars:
    my_list:
      - "apple"
      - "mango"
      - "orange"

Now we need to convert this to a single string with comma separated (or separated by any other character). I found users are using loops and adding to a string value but there is a simple way to do this as shown below.

    - name: Concatenate a list to string
      set_fact:
        my_string: "{{ my_list | join(',') }}"

Find the full playbook below.

---
- name: List to String Conversion
  hosts: localhost
  vars:
    my_list:
      - "apple"
      - "mango"
      - "orange"
  tasks:
    - name: Print the List
      debug:
        msg: "{{ my_list }}"

    - name: Concatenate a list to string
      set_fact:
        my_string: "{{ my_list | join(',') }}"

    - name: Print the String
      debug:
        msg: "{{ my_string }}"

Sample execution

$ ansible-playbook site.yml

PLAY [List to String Conversion] *********************************************************************************

TASK [Gathering Facts] *******************************************************************************************

ok: [localhost]

TASK [Print the List] ********************************************************************************************
ok: [localhost] => {
    "msg": [
        "apple",
        "mango",
        "orange"
    ]
}

TASK [Concatenate a list to string] ******************************************************************************
ok: [localhost]

TASK [Print the String] ******************************************************************************************
ok: [localhost] => {
    "msg": "apple,mango,orange"
}

PLAY RECAP *******************************************************************************************************
localhost                  : ok=4    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

Check Ansible Real Life GitHub repository for all use cases.

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Disclaimer: The views expressed and the content shared are those of the author and do not reflect the views of the author’s employer or techbeatly platform.

Gineesh Madapparambath is the author of the book - 𝗔𝗻𝘀𝗶𝗯𝗹𝗲 𝗳𝗼𝗿 𝗥𝗲𝗮𝗹-𝗟𝗶𝗳𝗲 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻. He has worked as a Systems Engineer, Automation Specialist, and content author. His primary focus is on Ansible Automation, Containerisation (OpenShift & Kubernetes), and Infrastructure as Code (Terraform). (aka Gini Gangadharan - iamgini.com)

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