Public bug reported:
The init script in the zookeeperd package is not able to stop the
service once started. This is because do_stop calls the is_running
function, which will return and the remainder of the do_stop function is
not executed (which does crucial start-stop-daemon invocation).
Steps to repro:
------------------------
# Start zookeeper , then query to see it is running
root@2d88cb921d2a:/# /etc/init.d/zookeeper status
* zookeeper is running
# Ensure that it is running... (snipped for brevity
root@2d88cb921d2a:/# ps aux | grep zookeeper
root 336 0.0 0.0 34048 8524 ? T 07:43 0:00 zile
/etc/init.d/zookeeper
zookeep+ 357 0.1 0.8 4682800 106684 ? Sl 07:51 0:01 /usr/bin/java
-cp /etc/zookeeper/conf:/usr/share/java/jline.jar...
# Now try to stop it
root@2d88cb921d2a:/# /etc/init.d/zookeeper stop
root@2d88cb921d2a:/# echo $?
0
# Check if its still running
root@2d88cb921d2a:/# ps aux | grep zookeeper
root 336 0.0 0.0 34048 8524 ? T 07:43 0:00 zile
/etc/init.d/zookeeper
zookeep+ 357 0.1 0.8 4682800 106684 ? Sl 07:51 0:02 /usr/bin/java
-cp /etc/zookeeper/conf:/usr/share/java/jline.jar...
# Instead invoke the correct start-stop daemon invocation
root@2d88cb921d2a:/# start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5
--pidfile /var/run/zookeeper/zookeeper.pid
root@2d88cb921d2a:/# ps aux | grep zookeeper
root 452 0.0 0.0 11984 912 ? S+ 08:21 0:00 grep
--color=auto zookeeper
Possible solution:
----------------------------
A more robust alternative to these functions can be found in the
cassandra package, whose functions are as follows:
is_running()
{
if [ -f $PIDFILE ]; then
pid=`cat $PIDFILE`
grep -Eq "$CMD_PATT" "/proc/$pid/cmdline" 2>/dev/null && return 0
return 1
fi
return 3
}
... and ...
do_stop()
{
# Return
# 0 if daemon has been stopped
# 1 if daemon was already stopped
# 2 if daemon could not be stopped
# other if a failure occurred
start-stop-daemon -K -p "$PIDFILE" -R TERM/30/KILL/5 >/dev/null
RET=$?
rm -f "$PIDFILE"
return $RET
}
** Affects: zookeeper (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1433469
Title:
zookeeper init script fails to stop service
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