capsul-flask/capsulflask/shell_scripts/capacity-avaliable.sh

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#!/bin/sh
#
# check available RAM and IPv4s
RAM_BYTES_TO_ALLOCATE="$1"
RAM_BYTES_AVAILABLE=$(grep -E "^(size|memory_available_bytes)" /proc/spl/kstat/zfs/arcstats | awk '{sum+=$3} END {printf "%.0f", sum}')
RAM_BYTES_REMAINDER="$((RAM_BYTES_AVAILABLE - RAM_BYTES_TO_ALLOCATE))"
if echo "$RAM_BYTES_TO_ALLOCATE" | grep -vqE "^[0-9]+$"; then
echo "RAM_BYTES_TO_ALLOCATE \"$RAM_BYTES_TO_ALLOCATE\" must be an integer"
exit 1
fi
# 20GB
if [ "$RAM_BYTES_REMAINDER" -le $((20 * 1024 * 1024 * 1024)) ]; then
echo "VM is requesting more RAM than $(hostname -f) has available."
echo "Bytes requested: $RAM_BYTES_TO_ALLOCATE"
echo "Bytes available: $RAM_BYTES_AVAILABLE"
exit 1
fi
IPV4_LIMIT=60
IPV4_COUNT=$(grep ip-add /var/lib/libvirt/dnsmasq/virbr2.status | wc -l)
if [ "$IPV4_COUNT" -ge "$IPV4_LIMIT" ]; then
echo "IPv4 address limit reached"
exit 1
fi
echo "yes"