在 CentOS7 上安装 zookeeper-3.4.9 服务1、创建 /usr/local/services/zookeeper 文件夹：	mkdir -p /usr/local/services/zookeeper2、进入到 /usr/local/services/zookeeper 目录中：	cd /usr/local/services/zookeeper3、下载 zookeeper-3.4.9.tar.gz：	wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.4.9/zookeeper-3.4.9.tar.gz4、解压缩 zookeeper-3.4.9.tar.gz：	tar -zxvf zookeeper-3.4.9.tar.gz5、进入到 /usr/local/services/zookeeper/zookeeper-3.4.9/conf 目录中：	cd zookeeper-3.4.9/conf/6、复制 zoo_sample.cfg 文件的并命名为为 zoo.cfg：	cp zoo_sample.cfg zoo.cfg7、用 vim 打开 zoo.cfg 文件并修改其内容为如下：	# The number of milliseconds of each tick	# zookeeper 定义的基准时间间隔，单位：毫秒	tickTime=2000	# The number of ticks that the initial 	# synchronization phase can take	initLimit=10	# The number of ticks that can pass between 	# sending a request and getting an acknowledgement	syncLimit=5	# the directory where the snapshot is stored.	# do not use /tmp for storage, /tmp here is just 	# example sakes.	# dataDir=/tmp/zookeeper	# 数据文件夹	dataDir=/usr/local/services/zookeeper/zookeeper-3.4.9/data	# 日志文件夹	dataLogDir=/usr/local/services/zookeeper/zookeeper-3.4.9/logs	# the port at which the clients will connect	# 客户端访问 zookeeper 的端口号	clientPort=2181	# the maximum number of client connections.	# increase this if you need to handle more clients	#maxClientCnxns=60	#	# Be sure to read the maintenance section of the 	# administrator guide before turning on autopurge.	#	# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance	#	# The number of snapshots to retain in dataDir	#autopurge.snapRetainCount=3	# Purge task interval in hours	# Set to "0" to disable auto purge feature	#autopurge.purgeInterval=18、保存并关闭 zoo.cfg 文件:	9、进入到 /usr/local/services/zookeeper/zookeeper-3.4.9/bin 目录中：	cd ../bin/10、用 vim 打开 /etc/ 目录下的配置文件 profile：	vim /etc/profile    并在其尾部追加如下内容：	# idea - zookeeper-3.4.9 config start - 2016-09-08	export ZOOKEEPER_HOME=/usr/local/services/zookeeper/zookeeper-3.4.9/	export PATH=$ZOOKEEPER_HOME/bin:$PATH	export PATH	# idea - zookeeper-3.4.9 config start - 2016-09-0811、使 /etc/ 目录下的 profile 文件即可生效：	source /etc/profile12、启动 zookeeper 服务：	zkServer.sh start    如打印如下信息则表明启动成功：	ZooKeeper JMX enabled by default	Using config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfg	Starting zookeeper ... STARTED13、查询 zookeeper 状态：	zkServer.sh status14、关闭 zookeeper 服务：	zkServer.sh stop    如打印如下信息则表明成功关闭：	ZooKeeper JMX enabled by default	Using config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfg	Stopping zookeeper ... STOPPED15、重启 zookeeper 服务：	zkServer.sh restart    如打印如下信息则表明重启成功：	ZooKeeper JMX enabled by default	Using config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfg	ZooKeeper JMX enabled by default	Using config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfg	Stopping zookeeper ... STOPPED	ZooKeeper JMX enabled by default	Using config: /usr/local/services/zookeeper/zookeeper-3.4.9/bin/../conf/zoo.cfg	Starting zookeeper ... STARTED