Start multiprocess chrony NTP server

multichronyd.sh

#!/bin/bash

servers=$(nproc)
chronyd="/usr/sbin/chronyd"

trap terminate SIGINT SIGTERM

terminate()
{
	for p in /var/run/chrony/chronyd*.pid; do
		pid=$(cat "$p" 2> /dev/null)
		[[ "$pid" =~ [0-9]+ ]] && kill "$pid"
	done
}

conf=""
for c in /etc/chrony.conf /etc/chrony/chrony.conf; do
	[ -f "$c" ] && conf=$c
done

case "$("$chronyd" --version | grep -o -E '[1-9]\.[0-9]+')" in
	1.*|2.*|3.*)
		echo "chrony version too old to run multiple instances"
		exit 1;;
	4.0)	opts="";;
	4.1)	opts="xleave copy";;
	*)	opts="xleave copy extfield F323";;
esac

for i in $(seq 1 "$servers"); do
	echo "Starting server instance #$i"
	"$chronyd" "$@" -n -x \
		"server 127.0.0.1 port 11123 minpoll 0 maxpoll 0 $opts" \
	       	"allow" \
	       	"cmdport 0" \
	       	"bindcmdaddress /var/run/chrony/chronyd-server$i.sock" \
	       	"pidfile /var/run/chrony/chronyd-server$i.pid" &
done

echo "Starting client instance"
"$chronyd" "$@" -n \
	"include $conf" \
	"port 11123" \
	"bindaddress 127.0.0.1" \
	"allow 127.0.0.1" &

wait

echo Exiting