test-conn-master.yml

---
- name:
  hosts: localhost
  gather_facts: false
  become: true

  tasks:

   - debug:
       msg: START - Testing conn from {{ host_src }} to {{ host_dst}} using port {{ port_dst }}

   - name: Verify if the port is open on dst host and register variable
     command: timeout 1 bash -c "</dev/tcp/{{host_dst}}/{{port_dst}}"
     ignore_errors: True
     register: listen_cmd

   - name: Creating template to open sockets on dst servers
     template:
      src: open_socket_script.j2
      dest: /tmp/open_socket_script.py
      mode: '0777'
     delegate_to: '{{host_dst}}'
     vars:
      port_dst: '{{ port_dst }}'
     when: listen_cmd is failed
     register: create_listen_script

   - name: Open listen ports that is not listening
     shell: "(cd /tmp; python /tmp/open_socket_script.py >/dev/null 2>&1 &)"
     async: 10
     poll: 0
     delegate_to: '{{host_dst}}'
     when: create_listen_script is succeeded and listen_cmd is failed
     register: open_port

   - debug: var=create_listen_script

   - name: Verify if the port is open on dst host and register variable
     command: timeout 1 bash -c "</dev/tcp/{{host_dst}}/{{port_dst}}"
     delegate_to: '{{host_src}}'
     ignore_errors: True
     register: run_test_on_src

   - name: Kill the python socket process and the listen port after test
     command: pkill -f /tmp/open_socket_script.py
     delegate_to: '{{host_dst}}'
     when: "not create_listen_script|skipped"

   - name: Removing socket script file
     file:
      path: /tmp/open_socket_script.py
      state: absent
     delegate_to: '{{host_dst}}'
     ignore_errors: True
     when: create_listen_script is success or create_listen_script is not skipped

   - debug:
       msg: END - SUCCESS - Testing conn from {{ host_src }} to {{ host_dst}} using port {{ port_dst }}
     when: run_test_on_src is succeeded

   - fail:
      msg: END - FAIL - Testing conn from {{ host_src }} to {{ host_dst}} using port {{ port_dst }}
     when: run_test_on_src is failed