linux 搭建zookeeper集群

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1.准备3台虚拟机，关闭各自防火墙

系统可采用centos或者red hat

本示例采用centos7

2.下载zookeeper

wget http://mirrors.hust.edu.cn/apache/zookeeper/zookeeper-3.4.8/zookeeper-3.4.8.tar.gz

3.解压缩

tar -zxvf zookeeper-3.4.8.tar.gz

4.zookeeper-3.4.8/conf 下面新增zoo.cfg

三台机器进行相同操作!

cd zookeeper-3.4.8/conf

vi zoo.cfg

内容如下:

tickTime=2000
dataDir=/usr/soft/data-zookeeper
clientPort=2181
initLimit=5
syncLimit=2
server.1=192.168.100.15:2888:3888
server.2=192.168.100.16:2888:3888
server.3=192.168.100.17:2888:3888

5.新建data目录/usr/soft/data-zookeeper

cd /usr/soft/data-zookeeper 新增myid文件

3台虚拟机分别定义myid文件内容，192.168.100.15 --> 1;192.168.100.16 --> 2;192.168.100.17 --> 3;

6.三台机器分别启动

./zkServer.sh start

7.检查状态

./zkServer.sh status

结果：

8.测试

Mode:leader有读写权限,Mode: follower 只有读取权限

测试脚本java

8.1 添加maven依赖

<dependency>            <groupId>org.apache.zookeeper</groupId>            <artifactId>zookeeper</artifactId>            <version>3.4.8</version> </dependency>

8.2

public class ZooKeeperTest {    private static final String HOST2 = "192.168.100.15:2181";    private static final String HOST1 = "192.168.100.16:2181";    private static final Integer TIMEOUT = 2000;    public static void main(String[] args) {        try {            ZooKeeper zooKeeper1 = new ZooKeeper(HOST1, TIMEOUT, null);            ZooKeeper zooKeeper2 = new ZooKeeper(HOST2, TIMEOUT, null);            System.out.println("16 创建节点...");            if (zooKeeper2.exists("/tests", false) == null) {                zooKeeper2.create("/tests", "zNode1".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);            }            System.out.println("=========查看节点是否创建成功========");            System.out.println(new String(zooKeeper1.getData("/tests", false, null)));            System.out.println("========修改节点的数据========");            System.out.println("16 修改节点...");            String data = "zNode2";            zooKeeper2.setData("/tests",data.getBytes(),-1);            System.out.println("========查看修改的节点是否成功=========");            System.out.println(new String(zooKeeper1.getData("/tests", false, null)));            System.out.println("========删除节点========");            System.out.println("16 修改节点...");            zooKeeper2.delete("/tests",-1);            System.out.println("========查看节点是否被删除=========");            System.out.println("节点状态:" + zooKeeper2.exists("/tests",false));            System.out.println("=========查看节点是否存在========");            System.out.println("15 查看节点...");            System.out.println(new String(zooKeeper1.getData("/tests", false, null)));        } catch (IOException e) {            e.printStackTrace();        } catch (InterruptedException e) {            e.printStackTrace();        } catch (KeeperException e) {            e.printStackTrace();        }    }}

测试结果：

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