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<p>Following up my chat with Mr. Markwalkder (from the isc gitlab),
the delay seems to be caused by the systemd start script. When
starting isc-dhcp-server via `service isc-dhcp-server start`, I
get the following syslog output</p>
<pre class="code highlight" lang="plaintext"><span id="LC1" class="line" lang="plaintext">Aug 26 17:10:18 host systemd[1]: Starting LSB: DHCP server...</span>
<span id="LC2" class="line" lang="plaintext">Aug 26 17:10:18 host isc-dhcp-server[27031]: Launching IPv4 server only.</span>
<span id="LC3" class="line" lang="plaintext">Aug 26 17:10:18 host dhcpd[27051]: Wrote 0 deleted host decls to leases file.</span>
<span id="LC4" class="line" lang="plaintext">Aug 26 17:10:18 host dhcpd[27051]: Wrote 0 new dynamic host decls to leases file.</span>
<span id="LC5" class="line" lang="plaintext">Aug 26 17:10:18 host dhcpd[27051]: Wrote 7 leases to leases file.</span>
<span id="LC6" class="line" lang="plaintext">Aug 26 17:10:18 host dhcpd[27053]: Server starting service.</span>
<span id="LC1" class="line" lang="plaintext">Aug 26 17:10:20 host isc-dhcp-server[27031]: Starting ISC DHCPv4 server: dhcpd.</span>
<span id="LC2" class="line" lang="plaintext">Aug 26 17:10:20 host systemd[1]: Started LSB: DHCP server.</span>
# cat /etc/init.d/isc-dhcp-server
#!/bin/sh
### BEGIN INIT INFO
# Provides: isc-dhcp-server
# Required-Start: $remote_fs $network $syslog
# Required-Stop: $remote_fs $network $syslog
# Should-Start: $local_fs slapd $named
# Should-Stop: $local_fs slapd
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: DHCP server
# Description: Dynamic Host Configuration Protocol Server
### END INIT INFO
PATH=/sbin:/bin:/usr/sbin:/usr/bin
test -f /usr/sbin/dhcpd || exit 0
DHCPD_DEFAULT="${DHCPD_DEFAULT:-/etc/default/isc-dhcp-server}"
# It is not safe to start if we don't have a default configuration...
if [ ! -f "$DHCPD_DEFAULT" ]; then
echo "$DHCPD_DEFAULT does not exist! - Aborting..."
if [ "$DHCPD_DEFAULT" = "/etc/default/isc-dhcp-server" ]; then
echo "Run 'dpkg-reconfigure isc-dhcp-server' to fix the problem."
fi
exit 0
fi
. /lib/lsb/init-functions
# Read init script configuration
[ -f "$DHCPD_DEFAULT" ] && . "$DHCPD_DEFAULT"
NAME4=dhcpd
NAME6=dhcpd6
DESC4="ISC DHCPv4 server"
DESC6="ISC DHCPv6 server"
# use already specified config file or fallback to defaults
DHCPDv4_CONF=${DHCPDv4_CONF:-/etc/dhcp/dhcpd.conf}
DHCPDv6_CONF=${DHCPDv6_CONF:-/etc/dhcp/dhcpd6.conf}
# try to read pid file name from config file or fallback to defaults
if [ -z "$DHCPDv4_PID" ]; then
DHCPDv4_PID=$(sed -n -e 's/^[ \t]*pid-file-name[ \t]*"\(.*\)"[ \t]*;.*$/\1/p' < "$DHCPDv4_CONF" 2>/dev/null | head -n 1)
fi
if [ -z "$DHCPDv6_PID" ]; then
DHCPDv6_PID=$(sed -n -e 's/^[ \t]*dhcpv6-pid-file-name[ \t]*"\(.*\)"[ \t]*;.*$/\1/p' < "$DHCPDv6_CONF" 2>/dev/null | head -n 1)
fi
DHCPDv4_PID="${DHCPDv4_PID:-/var/run/dhcpd.pid}"
DHCPDv6_PID="${DHCPDv6_PID:-/var/run/dhcpd6.pid}"
test_config()
{
VERSION="$1"
CONF="$2"
if ! /usr/sbin/dhcpd -t $VERSION -q -cf "$CONF" > /dev/null 2>&1; then
echo "dhcpd self-test failed. Please fix $CONF."
echo "The error was: "
/usr/sbin/dhcpd -t $VERSION -cf "$CONF"
exit 1
fi
}
check_status()
{
OPTION="$1"
PIDFILE="$2"
NAME="$3"
if [ ! -r "$PIDFILE" ]; then
test "$OPTION" != -v || echo "$NAME is not running."
return 3
fi
if read pid < "$PIDFILE" && ps -p "$pid" > /dev/null 2>&1; then
test "$OPTION" != -v || echo "$NAME is running."
return 0
else
test "$OPTION" != -v || echo "$NAME is not running but $PIDFILE exists."
return 1
fi
}
start_daemon()
{
VERSION="$1"
CONF="$2"
NAME="$3"
PIDFILE="$4"
DESC="$5"
shift 5
INTERFACES="$*"
test_config "$VERSION" "$CONF"
log_daemon_msg "Starting $DESC" "$NAME"
if [ -e "$PIDFILE" ]; then
log_failure_msg "dhcpd service already running (pid file $PIDFILE currenty exists)"
exit 1
fi
touch /var/lib/dhcp/$NAME.leases
start-stop-daemon --start --quiet --pidfile $PIDFILE \
--exec /usr/sbin/dhcpd -- $VERSION -q -cf $CONF $INTERFACES
sleep 2
if check_status -q $PIDFILE $NAME; then
log_end_msg 0
else
log_failure_msg "check syslog for diagnostics."
log_end_msg 1
exit 1
fi
}
stop_daemon()
{
if check_status -q $DHCPDv4_PID $NAME4; then
log_daemon_msg "Stopping $DESC4" "$NAME4"
start-stop-daemon --stop --quiet --pidfile $DHCPDv4_PID
log_end_msg $?
rm -f "$DHCPDv4_PID"
fi
if check_status -q $DHCPDv6_PID $NAME6; then
log_daemon_msg "Stopping $DESC6" "$NAME6"
start-stop-daemon --stop --quiet --pidfile $DHCPDv6_PID
log_end_msg $?
rm -f "$DHCPDv6_PID"
fi
}
case "$1" in
start)
if test -n "$INTERFACES" -a -z "$INTERFACESv4"; then
echo "DHCPv4 interfaces are no longer set by the INTERFACES variable in" >&2
echo "/etc/default/isc-dhcp-server. Please use INTERFACESv4 instead." >&2
echo "Migrating automatically for now, but this will go away in the future." >&2
INTERFACESv4="$INTERFACES"
fi
if test -n "$INTERFACESv4"; then
echo "Launching IPv4 server only."
start_daemon "-4" "$DHCPDv4_CONF" "$NAME4" \
"$DHCPDv4_PID" "$DESC4" "$INTERFACESv4"
fi
if test -n "$INTERFACESv6"; then
echo "Launching IPv6 server only."
start_daemon "-6" "$DHCPDv6_CONF" "$NAME6" \
"$DHCPDv6_PID" "$DESC6" "$INTERFACESv6"
fi
if test -z "$INTERFACESv4" -a -z "$INTERFACESv6"; then
echo "Launching both IPv4 and IPv6 servers (please configure INTERFACES in /etc/default/isc-dhcp-server if you only want one or the other)."
start_daemon "-4" "$DHCPDv4_CONF" "$NAME4" \
"$DHCPDv4_PID" "$DESC4" ""
start_daemon "-6" "$DHCPDv6_CONF" "$NAME6" \
"$DHCPDv6_PID" "$DESC6" ""
fi
;;
stop)
stop_daemon
;;
restart | force-reload)
$0 stop
sleep 2
$0 start
if [ "$?" != "0" ]; then
exit 1
fi
;;
status)
if test -n "$INTERFACES" -a -z "$INTERFACESv4"; then
INTERFACESv4="$INTERFACES"
fi
if test -n "$INTERFACESv4"; then
echo -n "Status of $DESC4: "
check_status -v $DHCPDv4_PID $NAME4 || exit $?
fi
if test -n "$INTERFACESv6"; then
echo -n "Status of $DESC6: "
check_status -v $DHCPDv6_PID $NAME6 || exit $?
fi
;;
*)
echo "Usage: $0 {start|stop|restart|force-reload|status}"
exit 1
esac
exit 0
Has anyone already experienced this issue?
</pre>
Thanks in advanve for your help.<br>
<br>
<div class="moz-cite-prefix">Am 26.08.19 um 14:55 schrieb Max
Uetrecht:<br>
</div>
<blockquote type="cite"
cite="mid:dTNbBCQIqlXIeabmTgtpBUAfq7hBDv7vjd-WagwwiLq8MZVP-fMLd47OD2Ln6eWb01y2P7vY4Ye0EEcLfO1s58BA2jV69QEm5RnX-PJtcBU=@protonmail.com">
<pre class="moz-quote-pre" wrap="">Hi,
after setting up a rather minor isc-dhcp-server configuration, I noticed
a long restart time (about 2s). I've created an issue on the ISC git:
<a class="moz-txt-link-freetext" href="https://gitlab.isc.org/isc-projects/dhcp/issues/42">https://gitlab.isc.org/isc-projects/dhcp/issues/42</a>
Can you reproduce my issue / help me reduce restart time?
</pre>
</blockquote>
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