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: $ram_bytes_available"
exit 1
fi
ipv4_limit=61
total_addresses_used=$(virsh net-dhcp-leases public2 | grep -E '.+' | tail -n +3 | wc -l)
if [ "$total_addresses_used" -ge "$ipv4_limit" ]; then
echo "IPv4 address limit reached"
exit 1
fi
echo "yes"