Script to detect hot-plugged CPU and RAM in VM. Tested on Ubuntu 16.04

hotaddcpuram.sh

#!/bin/bash
# Based on script by William Lam - http://engineering.ucsb.edu/~duonglt/vmware/
# Found at http://askubuntu.com/questions/764620/how-do-you-hotplug-enable-new-cpu-and-ram-in-a-virtual-machine

# Bring CPUs online
for CPU in $(ls /sys/devices/system/cpu/ |grep -E '(cpu[0-9])')
do
        CPU_DIR="/sys/devices/system/cpu/${CPU}"
        echo "Found cpu: \"${CPU_DIR}\" ..."
        CPU_STATE_FILE="${CPU_DIR}/online"
        if [ -f "${CPU_STATE_FILE}" ]; then
                STATE=$(cat "${CPU_STATE_FILE}" | grep 1)
                if [ "${STATE}" == "1" ]; then
                        echo -e "\t${CPU} already online"
                else
                         echo -e "\t${CPU} is new cpu, onlining cpu ..."
                         echo 1 > "${CPU_STATE_FILE}"
                fi
        else 
                echo -e "\t${CPU} already configured prior to hot-add"
        fi
done

# Bring all new Memory online
for RAM in $(grep line /sys/devices/system/memory/*/state)
do
        echo "Found ram: ${RAM} ..."
        if [[ "${RAM}" == *":offline" ]]; then
                echo "Bringing online"
                echo $RAM | sed "s/:offline$//"|sed "s/^/echo online > /"|source /dev/stdin
        else
                echo "Already online"
        fi
done