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How to run tasks on some nodes only

Only on first node in group

Check the group array

For example

- name: Ping first node listed in group "tower"
  when: inventory_hostname == groups['tower'][0]

Only if node is in group

Is the host in group node_b?

- hosts:
  - node_a
  - node_b
  gather_facts: no

  - ping:
    when: inventory_hostname in groups['node_b']

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