I have a file containing list of servers:

server1.me.com
server2.me.com
server3.me.com

And this is my bash file:

#!/usr/bin/bash

while read -r line
do
    ssh -np2222 -o GlobalKnownHostsFile=/dev/null -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no "$line" 
    'mkdir -pv /root/newimages/'
    rsync -Ptrave 'ssh -p2222' /root/*.tar "$line":/root/newimages/
    ssh -np2222 -o GlobalKnownHostsFile=/dev/null -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no "$line" 
    'find /root/newimages/ -name "*.tar" -exec docker load -i {} ;'
   
done < servers.txt

In a normal run, it runs line by line, which takes a lot of time.

How can I run it in a less time, so that let’s say 5 lines run at the same time instead of 1 line?

I mean, at the same time it should create an SSH connection to server1, server2, server3, server4 and server5 at the same time.

I don’t know what words to google, if it’s been asked before.