useful_scripts/shutdown_nodes.sh

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#!/bin/bash
rcmd="ssh"
cmd="sudo halt -p"
if [[ "$1" == "asrock" ]] ; then
hosts="192.168.1.21[1-4]"
elif [[ "$1" == "pi-k8s" ]] ; then
hosts="192.168.1.8[1-6]"
fi
pdsh -R $rcmd -l ubuntu -w $hosts -- $cmd