iperf server and client

iperf3.service

[Unit]
Description=iperf3 server
After=network.target

[Service]
User=nobody
ExecStart=/usr/bin/iperf3 -s --rsa-private-key-path /etc/iperf3/private_not_protected.pem --authorized-users-path /etc/iperf3/iperf.auth

[Install]
WantedBy=multi-user.target

iperf3.sh

#!/bin/bash

host=some.host
user=username
public_key=/path/to/public.key 
t=timelimit

iperf3 -c $host --rsa-public-key-path $public_key --username $user -t $t