Question regarding restart a juju cluster

Hi everyone, I experiment juju on maas. I deployed a k8s cluster with juju on 10 nvm machines. Deployment is ok. For some reason I need to shutdown the hole cluster: Power off the Motherboard + MaaS + cluster inside the VMs. Is there a way to shutdown softly the juju cluster? So I can power off the bare metal? If I reboot the bare metal, juju k8s cluster doesn’t restart: machines are stuck in “down state”. I tried to restart the 10 lxc vm one by one but juju k8s cluster stays “down” Regards,