Vagrant execute long running command via ssh or via provisioning

I have a script that surely will take a long time to execute. I have a multi-machine installation. On boot (preferably) I would like to have the script running on every one of the machines. However, I would like to do this asynchronously.

Alteatively I could execute vagrant ssh for each machine.

In the first case I add in the Vagrant file:

Vagrant.configure("2") do |config|
config.vm.provision "shell", run: "always", inline: 'bash /home/vagrant/shared_folder/script.sh  &'
...

Yet, although I can see a process running on each guest, it is not executed.

For the second case:

vagrant ssh client5 -c "/home/vagrant/shared_folder/script.sh  & sleep 1"

The sleep 1 is a "hack" suggested on another post. Yet, it runs only once and then exits.

The contents of the script are:

while [ true ];
do
        rand=`shuf -i 10-200 -n 1`
        curl "192.168.56.10/pages/"$rand"K.html"
        sleep 5
done

When I execute the script from inside the guest everything runs perfectly.

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