参考尚硅谷07_尚硅谷_zk_本地_安装_哔哩哔哩_bilibili，感谢尚硅谷！

安装

以Cent OS 7（CentOS-7-x86_64-DVD-2009）和ZooKeeper-3.5.7（https://wwrj.lanzoue.com/i7fqz0tfeula 密码是dqp9）为例。

我以集群部署为例，目前有三台主机，分别为hadoop1、hadoop2和hadoop3，他们的ip地址分别为（192.168.117.128，192.168.117.129，192.168.117.130）。

安装JDK（各种方式都可以），我这里采用yum安装

使用yum命令yum install -y java-1.8.0-openjdk.x86_64.
将ZooKeeper-3.5.7压缩包拷贝到/opt/software下
使用解压缩命令，将这个压缩包解压到/opt/module下，tar -zxvf apache-zookeeper-3.5.7-bin.tar.gz -C /opt/module
因为原ZooKeeper文件名过长，所以进行重命名操作mv apache-zookeeper-3.5.7-bin/ zookeeper-3.5.7,此步骤也可以省略。
进入zookeeper-3.5.7文件夹，新建一个zkData目录，用于存储ZooKeeper的信息，即/opt/module/zookeeper-3.5.7/zkData.
1. 在该目录下创建一个文件myid，随后向myid写入编号，该编号唯一标识集群中的ZooKeeper，这里，hadoop1,2,3的myid分别为1，2，3
进入/opt/module.zookeeper-3.5.7/conf目录下，使用命令mv zoo_sample.cfg zoo.cfg，将sample的配置文件改成正式的

将zoo.cfg文件中的改成如下：

# The number of milliseconds of each tick
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=/opt/module/zookeeper-3.5.7/zkData
# the port at which the clients will connect
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=1
server.1=192.168.117.128:2888:3888
server.2=192.168.117.129:2888:3888
server.3=192.168.117.130:2888:3888