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[Artyom <1368688@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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
~~

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: New

-- 
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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:
  New

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
  ~~

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