CODEWITHSUNDEEP
ansible
user14373743
user14373743

Reputation: 51

How to get variables from all hosts in Ansible?

I want to get an array of values of the specific variable from all hosts. For example: let's say I have host dc1.com with variable test_var = "value1" and host dc2.com with variable test_var = "value2". I want to get an array of these values that looks like this [ "value1", "value2" ]. Is it possible?

Upvotes: 2

Views: 2888

Answers (1)

Zeitounator
Zeitounator

Reputation: 44808

You can fetch any existing var from any available host through the hostvars dict available as a magic var

e.g.:

hostvars["dc1.com"].test_var

If you want a list of all found values, the following will go through all hosts in your inventory and extract the defined values in a list. Check the documentation on filters for more details and to arrange to your exact requirements.

- name: Show a list of all test_var values in my inventory
  debug:
    msg: "{{ hostvars | dict2items | selectattr('value.test_var', 'defined') | map(attribute='value.test_var') }}"

Bonus (once more study the documentation above for more explanation), almost the same as above but only for your two example hosts. Note I dropped the attribute defined filter taking for granted the var will exist.

- name: Show list of test_var valuse for dc1 and dc2 hosts
  vars:
    host_list:
      - dc1.com
      - dc2.com
  debug:
    msg: "{{ host_lists | map('extract', hostvars) | map(attribute='test_var') }}"

Upvotes: 4

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