Linux builds zookeeper cluster __linux

1. Prepare 3 virtual machines and close their firewalls

The system can be CentOS or red Hat

This example uses CENTOS7

2. Download Zookeeper

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

3. Decompression

TAR-ZXVF zookeeper-3.4.8.tar.gz

new zoo.cfg under 4.zookeeper-3.4.8/conf

Three machines to do the same operation!

CD zookeeper-3.4.8/conf

VI zoo.cfg

The contents are as follows:

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. New Data Directory/usr/soft/data-zookeeper

Cd/usr/soft/data-zookeeper New myID files

3 virtual machines define myID file contents respectively, 192.168.100.15--> 1;192.168.100.16--> 2;192.168.100.17 3;

6. Three machines are activated separately

./zkserver.sh Start

7. Check Status

./zkserver.sh Status

Results:

8. Test

Mode:leader has read and write access, mode:follower only Read permission

Test Script Java

8.1 Add Maven Dependencies

<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, Nu
            ll);
            Zookeeper ZooKeeper2 = new Zookeeper (HOST2, TIMEOUT, NULL);

            SYSTEM.OUT.PRINTLN ("16 Create Node ..."); if (zookeeper2.exists ("/tests", false) = null) {zookeeper2.create ("/tests", "ZNode1". GetBytes (), zoodefs .
            Ids.open_acl_unsafe, createmode.persistent);
            } System.out.println ("========= See if the node was created successfully ========");



            System.out.println (New String (Zookeeper1.getdata ("/tests", false, null));
            SYSTEM.OUT.PRINTLN ("======== modify node's data ========");
            SYSTEM.OUT.PRINTLN ("16 Modify Node ...");
            String data = "ZNode2"; Zookeeper2.setdata ("/tests", Data.getbytes (),-1);
            System.out.println ("======== See if the modified node was successful =========");


            System.out.println (New String (Zookeeper1.getdata ("/tests", false, null));
            System.out.println ("======== Delete node ========");
            SYSTEM.OUT.PRINTLN ("16 Modify Node ...");
            Zookeeper2.delete ("/tests",-1);
            System.out.println ("======== See if the node is deleted =========");


            SYSTEM.OUT.PRINTLN ("Node state:" + zookeeper2.exists ("/tests", false));
            System.out.println ("========= see if the node exists ========");
            System.out.println ("15 View node ...");
        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 (); }


    }
}

Test results: