handle_unreachable_hosts_method_1.yml

---

# in this method, no system will report as failed or unreachable
# unreachable systems identified in the first play
# any tasks/roles can be executed in the 2nd play on reachable systems
# result: all tasks are executed on all reachable systems

- name: ping hosts
  hosts: all
  gather_facts: no
  tasks:
    - block:
        - wait_for:
            timeout: 10 # you can increase this timeout as appropriate for your environment
            host: "{{ inventory_hostname }}"
            port: "{{ ansible_port }}"
          delegate_to: localhost
      rescue:
        - set_fact:
            unreachable: true
      always:
        - name: add reachable hosts to a new group
          add_host:
            name: "{{ inventory_hostname }}"
            group: reachable_hosts

    - debug:
        msg: "failed hosts: {{ ansible_play_hosts | map('extract', hostvars) | list | json_query(query) }}"
      run_once: true
      vars:
        query: "@[?unreachable].inventory_hostname"

    # you can take any action here on behalf of failed hosts
    # remember to use (run_once: true) and (delegate_to: localhost) as appropriate
    # why delegate_to: localhost? you might ask. Imagine a scenario where all hosts failed.
    # in that case, there are no hosts to execute any tasks on, you can delegate_to: localhost for any action needed
    # for example send email, make api call to update a record somewhere etc.


- name: other play
  hosts: reachable_hosts
  tasks:
    - debug:
        msg: "{{ inventory_hostname }} is reachable"