Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: isc-dhcp (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1368688
Title:
Inconsistence between /etc/init and /etc/init.d files
Status in “isc-dhcp” package in Ubuntu:
Confirmed
Bug description:
After upgrade Ubuntu server from 12.04 LTS to 14.04 LTS (with
do-release-upgrade) I found a strange behavior in /var/log/messages from
isc-dhcp-server. It had doubled DHCPREQUESTS/OFFERS/ACKs... It was like:
~~
dhcpd: DHCPDISCOVER from 00:0b:82:27:be:d1 via eth0
dhcpd: DHCPDISCOVER from 00:0b:82:27:be:d1 via eth0
DHCPREQUEST for 192.168.1.102 (10.112.1.252) from 00:0b:82:27:be:d1 via eth0
DHCPREQUEST for 192.168.1.102 (10.112.1.252) from 00:0b:82:27:be:d1 via eth0
DHCPACK on 192.168.1.102 to 00:0b:82:27:be:d1 via eth0
DHCPACK on 192.168.1.102 to 00:0b:82:27:be:d1 via eth0
~~
Futher investigation show that there was actually two dhcpd processes:
~~
dhcpd -q -cf /etc/dhcp/dhcpd.conf -pf /var/run/dhcp-server/dhcpd.pid
/usr/sbin/dhcpd -q -cf /etc/dhcp/dhcpd.conf -pf /var/run/dhcpd.pid
~~
The first one was executed from "/etc/init/isc-dhcp-server.conf" and second
from "/etc/init.d/isc-dhcp-server".
Looking inside "init/isc-dhcp-server.conf" I found:
~~
respawn
script
. /etc/default/isc-dhcp-server
......
exec dhcpd -user dhcpd -group dhcpd -f -q -4 -pf /run/dhcp-server/dhcpd.pid
-cf $CONFIG_FILE $INTERFACES
~~
As you can see path to PID file is hardcoded.
But in "init.d/isc-dhcp-server" startup script:
~~
# try to read pid file name from config file, with fallback to
/var/run/dhcpd.pid
if [ -z "$DHCPD_PID" ]; then
DHCPD_PID=$(sed -n -e 's/^[ \t]*pid-file-name[ \t]*"(.*)"[
\t]*;.*$/\1/p' < "$DHCPD_CONF" 2>/dev/null | head -n 1)
fi
DHCPD_PID="${DHCPD_PID:-/var/run/dhcpd.pid}"
......
case "$1" in
start)
test_config
log_daemon_msg "Starting $DESC" "$NAME"
start-stop-daemon --start --quiet --pidfile "$DHCPD_PID" \
--exec /usr/sbin/dhcpd -- \
-q $OPTIONS -cf "$DHCPD_CONF" -pf "$DHCPD_PID"
$INTERFACES
~~
So obivous is to either change init script to NOT use hardcoded path to PID
file and use $DHCP_PID (from /etc/default/isc-dhcp-server, which is sourced
inside this script), or at least change it to "default" one: /var/run/dhcpd.pid
OR
change init.d script to fallback to "/run/dhcp-server/dhcpd.pid"
instead of "/var/run/dhcpd.pid"
P.S. /var/run is a link to /run
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