搭建ZooKeeper集群
1、真实的集群是需要部署在不同的服务器上的，但是我们一个机器安装多个虚拟机会导致系统内存开销过大，所以我们本篇文章介绍下伪集群的搭建，也就是把所有的服务都搭建在一台虚拟机上，用端口进行区分，搭建三个节点的ZooKeeper集群(伪集群).
2、准备工作
1>、在虚拟机中安装JDK，文章见：Linux系统下安装jdk8_taibaishenlong的专栏-CSDN博客
2>、ZooKeeper压缩包上传到服务器，文章参考：Dubbo注册中心zooKeeper在linux下安装_taibaishenlong的专栏-CSDN博客
3>、将ZooKeeper解压，建立/usr/local/zookeeper-cluster目录，将解压后的Zookeeper复制到以下三个目录/usr/local/zookeeper-cluster/zookeeper-1，/usr/local/zookeeper-cluster/zookeeper-2，/usr/local/zookeeper-cluster/zookeeper-3
[root@localhost ~]# mkdir /usr/local/zookeeper-cluster
[root@localhost ~]# cp -r apache-zookeeper-3.5.6-bin /usr/local/zookeeper-cluster/zookeeper-1
[root@localhost ~]# cp -r apache-zookeeper-3.5.6-bin /usr/local/zookeeper-cluster/zookeeper-2
[root@localhost ~]# cp -r apache-zookeeper-3.5.6-bin /usr/local/zookeeper-cluster/zookeeper-34>、创建data目录，并将conf下的zoo_sample.cfg 文件改名为 zoo.cfg
mkdir /usr/local/zookeeper-cluster/zookeeper-1/data
mkdir /usr/local/zookeeper-cluster/zookeeper-2/data
mkdir /usr/local/zookeeper-cluster/zookeeper-3/data
mv /usr/local/zookeeper-cluster/zookeeper-1/conf/zoo_sample.cfg /usr/local/zookeeper-cluster/zookeeper-1/conf/zoo.cfg
mv /usr/local/zookeeper-cluster/zookeeper-2/conf/zoo_sample.cfg /usr/local/zookeeper-cluster/zookeeper-2/conf/zoo.cfg
mv /usr/local/zookeeper-cluster/zookeeper-3/conf/zoo_sample.cfg /usr/local/zookeeper-cluster/zookeeper-3/conf/zoo.cfg5>、 配置每一个Zookeeper 的dataDir 和 clientPort 分别为2181 2182 2183
修改/usr/local/zookeeper-cluster/zookeeper-1/conf/zoo.cfg
vim /usr/local/zookeeper-cluster/zookeeper-1/conf/zoo.cfg
clientPort=2181
dataDir=/usr/local/zookeeper-cluster/zookeeper-1/data修改/usr/local/zookeeper-cluster/zookeeper-2/conf/zoo.cfg
vim /usr/local/zookeeper-cluster/zookeeper-2/conf/zoo.cfg
clientPort=2182
dataDir=/usr/local/zookeeper-cluster/zookeeper-2/data修改/usr/local/zookeeper-cluster/zookeeper-3/conf/zoo.cfg
vim /usr/local/zookeeper-cluster/zookeeper-3/conf/zoo.cfg
clientPort=2183
dataDir=/usr/local/zookeeper-cluster/zookeeper-3/data3、配置集群
1>、在每个zookeeper的 data 目录下创建一个 myid 文件，内容分别是1、2、3 。这个文件就是记录每个服务器的ID
echo 1 >/usr/local/zookeeper-cluster/zookeeper-1/data/myid
echo 2 >/usr/local/zookeeper-cluster/zookeeper-2/data/myid
echo 3 >/usr/local/zookeeper-cluster/zookeeper-3/data/myid2>、在每一个zookeeper 的 zoo.cfg配置客户端访问端口（clientPort）和集群服务器IP列表 集群服务器IP列表：
vim /usr/local/zookeeper-cluster/zookeeper-1/conf/zoo.cfg
vim /usr/local/zookeeper-cluster/zookeeper-2/conf/zoo.cfg
vim /usr/local/zookeeper-cluster/zookeeper-3/conf/zoo.cfg
server.1=192.168.149.135:2881:3881
server.2=192.168.149.135:2882:3882
server.3=192.168.149.135:2883:3883解释：server.服务器ID=服务器IP地址：服务器之间通信端口：服务器之间投票选举端口
4、启动集群
启动集群就是分别启动每个实例
/usr/local/zookeeper-cluster/zookeeper-1/bin/zkServer.sh start
/usr/local/zookeeper-cluster/zookeeper-2/bin/zkServer.sh start
/usr/local/zookeeper-cluster/zookeeper-3/bin/zkServer.sh start启动后我们查询一下每个实例的运行状态 ：
/usr/local/zookeeper-cluster/zookeeper-1/bin/zkServer.sh status
/usr/local/zookeeper-cluster/zookeeper-2/bin/zkServer.sh status
/usr/local/zookeeper-cluster/zookeeper-3/bin/zkServer.sh status先查询第一个服务 ：
Mode为follower表示是跟随者（从）
再查询第二个服务Mod 为leader表示是领导者（主）
查询第三个为跟随者（从）
至此，伪集群搭建完毕，如果要配置真集群，那就是将每个实例分别安装到每台机器上，不用修改端口。
路漫漫其修远兮，吾将上下而求索，希望此篇文章对大家有所帮助......