zookeeper 3.5.5启动默认会把AdminService服务启动，这个服务默认是8080端口，是一个通过jetty启动的管理控制台，一般不会用到，网上的复制粘贴就是来自同一个办法如下：

方法一、删除jetty

方法二、修改端口。

修改方法的方法有两种：

在启动脚本中增加 -Dzookeeper.admin.serverPort=你的端口号.

-Dzookeeper.admin.serverPort=你的未使用端口号

在zoo.cfg中增加admin.serverPort=没有被占用的端口号

admin.serverPort=没有被占用的端口号

方法三：停用这个服务。

在启动脚本中增加-Dzookeeper.admin.enableServer=false

-Dzookeeper.admin.enableServer=false

建议选择方法三，因为没有端口需求。
但是问题来了，到底在哪里改，笔者找了很久：
找到 zookeeper/bin 目录下的启动脚本 zkServer.sh

vim /bin/zkServer.sh

1、在哪里改取决于你启动zkServer.sh跟的参数，比如: ./zkServer.sh start-foreground，使用这个命令启动zookeeper可以查看错误信息
2、找到脚本中case语句的start-foreground分支，新增 -Dzookeeper.admin.enableServer=false
重新启动：./zkServer.sh start-foreground

case $1 in
start)
    echo  -n "Starting zookeeper ... "
    if [ -f "$ZOOPIDFILE" ]; then
      if kill -0 `cat "$ZOOPIDFILE"` > /dev/null 2>&1; then
         echo $command already running as process `cat "$ZOOPIDFILE"`.
         exit 1
      fi
    fi
    nohup "$JAVA" $ZOO_DATADIR_AUTOCREATE "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" \
    "-Dzookeeper.log.file=${ZOO_LOG_FILE}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \
    -XX:+HeapDumpOnOutOfMemoryError -XX:OnOutOfMemoryError='kill -9 %p' \
    -cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" > "$_ZOO_DAEMON_OUT" 2>&1 < /dev/null &
    if [ $? -eq 0 ]
    then
      case "$OSTYPE" in
      *solaris*)
        /bin/echo "${!}\\c" > "$ZOOPIDFILE"
        ;;
      *)
        /bin/echo -n $! > "$ZOOPIDFILE"
        ;;
      esac
      if [ $? -eq 0 ];
      then
        sleep 1
        pid=$(cat "${ZOOPIDFILE}")
        if ps -p "${pid}" > /dev/null 2>&1; then
          echo STARTED
        else
          echo FAILED TO START
          exit 1
        fi
      else
        echo FAILED TO WRITE PID
        exit 1
      fi
    else
      echo SERVER DID NOT START
      exit 1
    fi
    ;;
start-foreground)
    ZOO_CMD=(exec "$JAVA")
    if [ "${ZOO_NOEXEC}" != "" ]; then
      ZOO_CMD=("$JAVA")
    fi
    "${ZOO_CMD[@]}" $ZOO_DATADIR_AUTOCREATE "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" \
    "-Dzookeeper.log.file=${ZOO_LOG_FILE}" "-Dzookeeper.admin.enableServer=false" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \
    -XX:+HeapDumpOnOutOfMemoryError -XX:OnOutOfMemoryError='kill -9 %p' \
    -cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG"
    ;;
print-cmd)
    echo "\"$JAVA\" $ZOO_DATADIR_AUTOCREATE -Dzookeeper.log.dir=\"${ZOO_LOG_DIR}\" \
    -Dzookeeper.log.file=\"${ZOO_LOG_FILE}\" -Dzookeeper.root.logger=\"${ZOO_LOG4J_PROP}\" \
    -XX:+HeapDumpOnOutOfMemoryError -XX:OnOutOfMemoryError='kill -9 %p' \
    -cp \"$CLASSPATH\" $JVMFLAGS $ZOOMAIN \"$ZOOCFG\" > \"$_ZOO_DAEMON_OUT\" 2>&1 < /dev/null"
    ;;
stop)
    echo -n "Stopping zookeeper ... "
    if [ ! -f "$ZOOPIDFILE" ]
    then
      echo "no zookeeper to stop (could not find file $ZOOPIDFILE)"
    else
      $KILL $(cat "$ZOOPIDFILE")
      rm "$ZOOPIDFILE"
      sleep 1
      echo STOPPED
    fi
    exit 0
    ;;
version)
    ZOOMAIN=org.apache.zookeeper.version.VersionInfoMain
    $JAVA -cp "$CLASSPATH" $ZOOMAIN 2> /dev/null
    ;;
restart)
    shift
    "$0" stop ${@}
    sleep 3
    "$0" start ${@}
    ;;
status)
    # -q is necessary on some versions of linux where nc returns too quickly, and no stat result is output
    clientPortAddress=`$GREP "^[[:space:]]*clientPortAddress[^[:alpha:]]" "$ZOOCFG" | sed -e 's/.*=//'`
    if ! [ $clientPortAddress ]
    then
	clientPortAddress="localhost"
    fi
    clientPort=`$GREP "^[[:space:]]*clientPort[^[:alpha:]]" "$ZOOCFG" | sed -e 's/.*=//'`
    if ! [[ "$clientPort"  =~ ^[0-9]+$ ]]
    then
       dataDir=`$GREP "^[[:space:]]*dataDir" "$ZOOCFG" | sed -e 's/.*=//'`
       myid=`cat "$dataDir/myid"`
       if ! [[ "$myid" =~ ^[0-9]+$ ]] ; then
         echo "clientPort not found and myid could not be determined. Terminating."
         exit 1
       fi
       clientPortAndAddress=`$GREP "^[[:space:]]*server.$myid=.*;.*" "$ZOOCFG" | sed -e 's/.*=//' | sed -e 's/.*;//'`
       if [ ! "$clientPortAndAddress" ] ; then
           echo "Client port not found in static config file. Looking in dynamic config file."
           dynamicConfigFile=`$GREP "^[[:space:]]*dynamicConfigFile" "$ZOOCFG" | sed -e 's/.*=//'`
           clientPortAndAddress=`$GREP "^[[:space:]]*server.$myid=.*;.*" "$dynamicConfigFile" | sed -e 's/.*=//' | sed -e 's/.*;//'`
       fi
       if [ ! "$clientPortAndAddress" ] ; then
          echo "Client port not found. Terminating."
          exit 1
       fi
       if [[ "$clientPortAndAddress" =~ ^.*:[0-9]+ ]] ; then
          clientPortAddress=`echo "$clientPortAndAddress" | sed -e 's/:.*//'`
       fi
       clientPort=`echo "$clientPortAndAddress" | sed -e 's/.*://'`
       if [ ! "$clientPort" ] ; then
          echo "Client port not found. Terminating."
          exit 1
       fi
    fi
    echo "Client port found: $clientPort. Client address: $clientPortAddress."
    STAT=`"$JAVA" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" "-Dzookeeper.log.file=${ZOO_LOG_FILE}" \
             -cp "$CLASSPATH" $JVMFLAGS org.apache.zookeeper.client.FourLetterWordMain \
             $clientPortAddress $clientPort srvr 2> /dev/null    \
          | $GREP Mode`
    if [ "x$STAT" = "x" ]
    then
        echo "Error contacting service. It is probably not running."
        exit 1
    else
        echo $STAT
        exit 0
    fi
    ;;
*)