script de inicialização para zookeeper

Question

eu vi que os desenvolvedores do zookeeper têm um ótimo script zkServer.sh para iniciar, parar, reiniciar o zookeeper etc., mas eu não tenho idéia do porquê eles decidiram pular o script init para usar.

Com o script zkServer.sh não é possível definir o zookeeper para ser executado na inicialização do servidor, por exemplo.

Então, alguém sabe como envolver ou usar um script de inicialização do zookeeper que funcione corretamente?

aqui está o link para o arquivo zkServer.sh https://github.com/apache/zookeeper/blob/master/bin/zkServer.sh

Obrigado pela sua ajuda

Aqui está o meu script de inicialização de exemplo que eu só preciso de ajuda para tunning

#!/bin/bash
#
# /etc/init.d/zookeeper
#
# Startup script for Zookeeper
#
# chkconfig: 2345 80 20
# description: Starts and stops Zookeeper
# pidfile: /var/run/zookeeper/zookeeper.pid

### BEGIN INIT INFO
# Provides:          zookeeper
# Required-Start:    $remote_fs $network $named $time
# Required-Stop:     $remote_fs $network $named $time
# Should-Start:      ntp mdadm
# Should-Stop:       ntp mdadm
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: distributed storage system for structured data
# Description:       Zookeeper is a distributed (peer-to-peer) system for
#                    the management and storage of structured data.
### END INIT INFO

. /etc/rc.d/init.d/functions

#export ZK_HOME=/usr/share/zookeeper
#export ZK_CONF=/etc/zookeeper/conf
#export ZK_INCLUDE=$ZK_HOME/zookeeper.in.sh
export ZK_HOME=/zookeeper/opt/zookeeper
export ZK_CONF=/zookeeper/opt/zookeeper/conf
export ZK_INCLUDE=$ZK_HOME/bin/zookeeper.in.sh

#export ZK_OWNR=zookeeper
export ZK_OWNR=root
NAME="zookeeper"
log_file=/var/log/zookeeper/zookeeper.log
pid_file=/var/run/zookeeper/zookeeper.pid
lock_file=/var/lock/subsys/$NAME
#ZK_PROG=/usr/sbin/zookeeper
ZK_PROG=/zookeeper/opt/zookeeper/bin/zkServer.sh

# The first existing directory is used for JAVA_HOME if needed.
JVM_SEARCH_DIRS="/usr/lib/jvm/jre /usr/lib/jvm/jre-1.7.* /usr/lib/jvm/java-1.7.*/jre"

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# If JAVA_HOME has not been set, try to determine it.
if [ -z "$JAVA_HOME" ]; then
    # If java is in PATH, use a JAVA_HOME that corresponds to that. This is
    # both consistent with how the upstream startup script works, and with
    # the use of alternatives to set a system JVM (as is done on Debian and
    # Red Hat derivatives).
    java="'/usr/bin/which java 2>/dev/null'"
    if [ -n "$java" ]; then
        java='readlink --canonicalize "$java"'
        JAVA_HOME='dirname "\'dirname \$java\'"'
    else
        # No JAVA_HOME set and no java found in PATH; search for a JVM.
        for jdir in $JVM_SEARCH_DIRS; do
            if [ -x "$jdir/bin/java" ]; then
                JAVA_HOME="$jdir"
                break
            fi
        done
        # if JAVA_HOME is still empty here, punt.
    fi
fi
JAVA="$JAVA_HOME/bin/java"
export JAVA_HOME JAVA

case "$1" in
    start)
        # Zookeeper startup
        echo -n "Starting Zookeeper: "
        [ -d 'dirname "$pid_file"' ] || \
            install -m 755 -o $ZK_OWNR -g $ZK_OWNR -d 'dirname $pid_file'
        $ZK_PROG start /zookeeper/opt/zookeeper/conf/zoo.cfg $ZK_CONF -p $pid_file > $log_file 2>&1
        retval=$?
        [ $retval -eq 0 ] && touch $lock_file
        echo "OK"
        ;;
    stop)
        # Zookeeper shutdown
        echo -n "Shutdown Zookeeper: "
        kill 'cat $pid_file'
        retval=$?
        [ $retval -eq 0 ] && rm -f $lock_file
        for t in 'seq 40'; do
            status -p $pid_file zookeeper > /dev/null 2>&1
            retval=$?
            if [ $retval -eq 3 ]; then
                echo "OK"
                exit 0
            else
                sleep 0.5
            fi;
        done
        # Adding a sleep here to give jmx time to wind down (ZK-4483). Not ideal...
        # Adam Holmberg suggests this, but that would break if the jmx port is changed
        # for t in 'seq 40'; do netstat -tnlp | grep "0.0.0.0:7199" > /dev/null 2>&1 && sleep 0.1 || break; done
        sleep 5
        status -p $pid_file zookeeper > /dev/null 2>&1
        retval=$?
        if [ $retval -eq 3 ]; then
            echo "OK"
        else
            echo "ERROR: could not stop $NAME"
            exit 1
        fi
        ;;
    reload|restart)
        $0 stop
        $0 start
        ;;
    status)
        status -p $pid_file zookeeper
        exit $?
        ;;
    *)
        echo "Usage: 'basename $0' start|stop|status|restart|reload"
        exit 1
esac

exit 0

O problema agora é se eu faço service zookeerper start ele nunca completa e se eu for olhar os serviços zookeeper em execução de outra sessão de terminal, eu vejo como 3 deles..e quando eu faço service zookeeper status i obter o seguinte

● zookeeper.service - LSB: distributed storage system for structured data
   Loaded: loaded (/etc/rc.d/init.d/zookeeper; bad; vendor preset: disabled)
   Active: failed (Result: timeout) since Thu 2017-08-24 18:11:00 UTC; 2min 3s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 19673 ExecStart=/etc/rc.d/init.d/zookeeper start (code=exited, status=0/SUCCESS)
   CGroup: /system.slice/zookeeper.service
           └─19691 /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-2.b16.el7_4.x86_64/jre/bin/java -Dzookeeper.log.dir=. -Dzookeepe...

Aug 24 18:06:00 10.34.227.131 systemd[1]: Starting LSB: distributed storage system for structured data...
Aug 24 18:06:01 10.34.227.131 zookeeper[19673]: Starting Zookeeper: OK
Aug 24 18:06:01 10.34.227.131 systemd[1]: PID file /var/run/zookeeper/zookeeper.pid not readable (yet?) after start.
Aug 24 18:11:00 10.34.227.131 systemd[1]: zookeeper.service start operation timed out. Terminating.
Aug 24 18:11:00 10.34.227.131 systemd[1]: Failed to start LSB: distributed storage system for structured data.
Aug 24 18:11:00 10.34.227.131 systemd[1]: Unit zookeeper.service entered failed state.
Aug 24 18:11:00 10.34.227.131 systemd[1]: zookeeper.service failed.

    

Answer 1

Isso que funcionou

# ZooKeeper install path (where you extracted the tarball)
ZOOKEEPER='/zookeeper/opt/zookeeper'
ZOOUSER=root

source /etc/rc.d/init.d/functions
source $ZOOKEEPER/bin/zkEnv.sh

RETVAL=0
PIDFILE="/var/run/zookeeper/zookeeper.pid"
desc="ZooKeeper daemon"

start() {
  echo -n $"Starting $desc (zookeeper): "
  daemon --user $ZOOUSER $ZOOKEEPER/bin/zkServer.sh start
  RETVAL=$?
  echo
  [ $RETVAL -eq 0 ] && touch /var/lock/subsys/zookeeper
  return $RETVAL
}

stop() {
  echo -n $"Stopping $desc (zookeeper): "
  daemon --user $ZOOUSER $ZOOKEEPER/bin/zkServer.sh stop
  RETVAL=$?
  sleep 5
  echo
  [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/zookeeper $PIDFILE
}

restart() {
  stop
  start
}

get_pid() {
  cat "$PIDFILE"
}

checkstatus(){
  status -p $PIDFILE ${JAVA_HOME}/bin/java
  RETVAL=$?
}

condrestart(){
  [ -e /var/lock/subsys/zookeeper ] && restart || :
}

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    checkstatus
    ;;
  restart)
    restart
    ;;
  condrestart)
    condrestart
    ;;
  *)
    echo $"Usage: $0 {start|stop|status|restart|condrestart}"
    exit 1
esac

exit $RETVAL

    

Answer 2

Você pode precisar instalar o lsb-core (apt-get install lsb-core) para utilizar as funções incluídas em "source /etc/rc.d/init.d/functions". O caminho será diferente. Para mim (Ubuntu Server 16.04.5 LTS), o caminho era "/ lib / lsb / init-functions" não "/etc/rc.d/init.d/functions"