perf.yml

- hosts: servers
  remote_user: centos
  tasks:
  - name: start server iperf
    shell: iperf3 --server --one-off --daemon

- hosts: clients
  remote_user: centos
  tasks:
  - name: set iperf server
    set_fact: iperf_server="{{ groups['servers'][groups['clients'].index(inventory_hostname)] }}"
  - name: set output base
    set_fact: output_base="{{ ansible_date_time.date }}_{{ ansible_date_time.hour }}{{ ansible_date_time.minute }}_{{ iperf_server }}.out"
  - name: set iperf out
    set_fact: iperf_out="iperf_{{ output_base }}"
  - name: set mtr out
    set_fact: mtr_out="mtr_{{ output_base }}"
  - name: start client iperf
    shell: "iperf3 --client {{ iperf_server }} --time 600 >> {{ iperf_out }}"
  - name: start client mtr
    shell: "/usr/sbin/mtr --report {{ iperf_server }} -c 100 >> {{ mtr_out }}"
  - name: grab iperf output
    fetch: src={{ iperf_out }} dest=results/ flat=yes
  - name: grab mtr output
    fetch: src={{ mtr_out }} dest=results/ flat=yes

- hosts: localhost
  connection: local
  tasks:
  - name: stats
    tags: stats
    shell: "tail -3 results/iperf*.out | awk '/Gbits/ { sum += $7; n++} END { print sum / n }'"
    register: stats
  - name: print stats
    tags: stats
    debug: msg="Average iperf bandwidth {{ stats.stdout }} Gbits/s"