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

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#!/bin/sh
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#
# check available RAM and IPv4s
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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))"
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if echo "$ram_bytes_to_allocate" | grep -vqE "^[0-9]+$"; then
echo "ram_bytes_to_allocate \"$ram_bytes_to_allocate\" must be an integer"
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exit 1
fi
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# 20GB
if [ "$ram_bytes_remainder" -le $((20 * 1024 * 1024 * 1024)) ]; then
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echo "VM is requesting more RAM than $(hostname -f) has available."
echo "Bytes requested: $ram_bytes_to_allocate"
echo "Bytes available: $ram_bytes_available"
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exit 1
fi
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ipv4_limit=28
used_ips=$(grep ip-add "/var/lib/libvirt/dnsmasq/virbr1.status" | cut -d '"' -f 4)
reserved_ips=$(cat "/var/lib/libvirt/dnsmasq/public1.hostsfile" | cut -d ',' -f 2)
total_addresses_used=$(printf "$used_ips\n$reserved_ips" | sort | uniq | wc -l)
ipv4_count=$(printf "$total_addresses_used")
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if [ "$ipv4_count" -ge "$ipv4_limit" ]; then
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echo "IPv4 address limit reached"
exit 1
fi
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echo "yes"