udp.yml

---
- name: start UDP server
  hosts: server
  vars:
    server_port: "{{ server.port }}"
  gather_facts: false
  become: true
  tasks:
    - name: start ncat as UDP server
      shell: ncat -u -k -c 'echo hello' -l "{{ server_port }}" &
      register: result
      changed_when: false

    - name: print out the result
      debug: var=result

- name: UDP connection between two droplets
  hosts: client
  vars:
    server_port: "{{ server.port }}"
    timeout: 3
    debug: false
  gather_facts: false
  become: true
  tasks:
    - name: check the UDP port reachability (IPv4)
      shell: nc -4 -v -u -w "{{ timeout }}" "{{ server.ipv4 }}" "{{ server_port }}" 2>/dev/null
      register: result
      changed_when: false
      failed_when: "result.rc != 0 or 'hello' not in result.stdout"
      ignore_errors: "{{ debug }}"

    - name: print out the result
      debug: var=result

    - name: check the UDP port reachability (private IPv4)
      shell: nc -4 -v -u -w "{{ timeout }}" "{{ server.ipv4_private }}" "{{ server_port }}" 2>/dev/null
      register: result
      changed_when: false
      failed_when: "result.rc != 0 or 'hello' not in result.stdout"
      ignore_errors: "{{ debug }}"

    - name: print out the result
      debug: var=result

    - name: check the UDP port reachability (IPv6)
      shell: nc -6 -v -u -w "{{ timeout }}" "{{ server.ipv6 }}" "{{ server_port }}" 2>/dev/null
      register: result
      changed_when: false
      failed_when: "result.rc != 0 or 'hello' not in result.stdout"
      ignore_errors: "{{ debug }}"

    - name: print out the result
      debug: var=result

    - name: check the UDP port reachability (Floating IP)
      shell: nc -4 -v -u -w "{{ timeout }}" "{{ server.flip }}" "{{ server_port }}" 2>/dev/null
      register: result
      changed_when: false
      failed_when: "result.rc != 0 or 'hello' not in result.stdout"
      ignore_errors: true

    - name: print out the result
      debug: var=result

    - fail: msg="finish the test without stopping the UDP server"
      when: debug

- name: stop UDP server
  hosts: server
  gather_facts: false
  become: true
  tasks:
    - name: stop ncat
      command: killall ncat
      changed_when: false