Zookeeper集群安装部署及简单测试使用

一.安装部署

1．集群规划

在ecs-az3-yc-0020、ecs-az3-yc-0021和ecs-az3-yc-0022三个节点上部署Zookeeper。Zookeeper版本为3.4.10

2．解压安装

（1）解压Zookeeper安装包到/opt/module/目录下

[root@ecs-az3-yc-0020 software]# tar -zxvf zookeeper-3.4.10.tar.gz -C /opt/module/

3．配置服务器编号

（1）在/opt/module/zookeeper-3.4.10/这个目录下创建zkData

[root@ecs-az3-yc-0020 zookeeper-3.4.10]# mkdir -p zkData

（2）在/opt/module/zookeeper-3.4.10/zkData目录下创建一个myid的文件

[root@ecs-az3-yc-0020 zkData]# touch myid

添加myid文件，注意一定要在linux里面创建，在notepad++里面很可能乱码
（3）编辑myid文件

[root@ecs-az3-yc-0020 zkData]# vi myid

在文件中添加与server对应的编号：1

4．配置zoo.cfg文件

（1）重命名/opt/module/zookeeper-3.4.10/conf这个目录下的zoo_sample.cfg为zoo.cfg

[root@ecs-az3-yc-0020 conf]# mv zoo_sample.cfg zoo.cfg

（2）打开zoo.cfg文件

[root@ecs-az3-yc-0020 conf]# vim zoo.cfg

#修改数据存储路径配置
dataDir=/opt/module/zookeeper-3.4.10/zkData
##################增加如下配置
#######################cluster##########################
server.1=ecs-az3-yc-0020:2888:3888
server.2=ecs-az3-yc-0021:2888:3888
server.3=ecs-az3-yc-0022:2888:3888

（3）同步配置好的/opt/module/zookeeper-3.4.10目录内容到ecs-az3-yc-0021、ecs-az3-yc-0022

[root@ecs-az3-yc-0020 module]# scp zookeeper-3.4.10 –r root@ecs-az3-yc-0021:/opt/module
[root@ecs-az3-yc-0020 module]# scp zookeeper-3.4.10 –r root@ecs-az3-yc-0022:/opt/moudle

并分别在ecs-az3-yc-0021、ecs-az3-yc-0022上修改myid文件中内容为2、3

（4）配置参数解读

server.A=B:C:D

A是一个数字，表示这个是第几号服务器；
集群模式下配置一个文件myid，这个文件在dataDir目录下，这个文件里面有一个数据就是A的值，Zookeeper启动时读取此文件，拿到里面的数据与zoo.cfg里面的配置信息比较从而判断到底是哪个server。
B是这个服务器的ip地址；
C是这个服务器与集群中的Leader服务器交换信息的端口；
D是万一集群中的Leader服务器挂了，需要一个端口来重新进行选举，选出一个新的Leader，而这个端口就是用来执行选举时服务器相互通信的端口。
（5)修改host（如果配置中用的主机名例如ecs-az3-yc-0021必须修改）使用ip则不必修改

[云内网ip].188  ecs-az3-yc-0021
[云内网ip].197  ecs-az3-yc-0022
[云内网ip].213  ecs-az3-yc-0020

4．集群操作

（1）分别启动Zookeeper

[root@ecs-az3-yc-0020 zookeeper-3.4.10]# bin/zkServer.sh start
[root@ecs-az3-yc-0021 zookeeper-3.4.10]# bin/zkServer.sh start
[root@ecs-az3-yc-0022 zookeeper-3.4.10]# bin/zkServer.sh start

（2）查看状态

[root@ecs-az3-yc-0020 zookeeper-3.4.10]# bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: follower

[root@ecs-az3-yc-0021 zookeeper-3.4.10]# bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: leader

[root@ecs-az3-yc-0022 zookeeper-3.4.10]# bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.4.10/bin/../conf/zoo.cfg
Mode: follower

二.客户端命令行操作

命令基本语法	功能描述
help	显示所有操作命令
ls path [watch]	使用 ls 命令来查看当前znode中所包含的内容
ls2 path [watch]	查看当前节点数据并能看到更新次数等数据
create	普通创建 -s 含有序列 -e 临时（重启或者超时消失）
get path [watch]	获得节点的值
set	设置节点的具体值
stat	查看节点状态
delete	删除节点
rmr	递归删除节点

1．启动客户端

[root@ecs-az3-yc-0020 zookeeper-3.4.10]# bin/zkCli.sh

2．显示所有操作命令

[zk: localhost:2181(CONNECTED) 1] help

[zk: localhost:2181(CONNECTED) 0] help
ZooKeeper -server host:port cmd args
    stat path [watch]
    set path data [version]
    ls path [watch]
    delquota [-n|-b] path
    ls2 path [watch]
    setAcl path acl
    setquota -n|-b val path
    history
    redo cmdno
    printwatches on|off
    delete path [version]
    sync path
    listquota path
    rmr path
    get path [watch]
    create [-s] [-e] path data acl
    addauth scheme auth
    quit
    getAcl path
    close
    connect host:port

3．查看当前znode中所包含的内容

[zk: localhost:2181(CONNECTED) 0] ls /

4．查看当前节点详细数据

[zk: localhost:2181(CONNECTED) 1] ls2 /
[zookeeper]
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1

5．分别创建2个普通节点

[zk: localhost:2181(CONNECTED) 3] create /greetest "hbq"
Created /greetest

[zk: localhost:2181(CONNECTED) 4] create /greetest/test "hbqtest"
Created /greetest/test

6．获得节点的值

[zk: localhost:2181(CONNECTED) 5] get /greetest
hbq
cZxid = 0x900000133
ctime = Thu Apr 23 15:24:54 CST 2020
mZxid = 0x900000133
mtime = Thu Apr 23 15:24:54 CST 2020
pZxid = 0x900000134
cversion = 1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 3
numChildren = 1

[zk: localhost:2181(CONNECTED) 6] get /greetest/test
hbqtest
cZxid = 0x900000134
ctime = Thu Apr 23 15:26:42 CST 2020
mZxid = 0x900000134
mtime = Thu Apr 23 15:26:42 CST 2020
pZxid = 0x900000134
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0

7．创建短暂节点

[zk: localhost:2181(CONNECTED) 8] create -e /greetest/temp "tempnode"
Created /greetest/temp

（1）在当前客户端是能查看到的

[zk: localhost:2181(CONNECTED) 9] ls /greetest
[temp, test]

（2）退出当前客户端然后再重启客户端

[zk: localhost:2181(CONNECTED) 12] quit
[hadoop@ecs-az3-yc-0022 zookeeper-3.4.10]# bin/zkCli.sh

（3）再次查看根目录下短暂节点已经删除

[zk: localhost:2181(CONNECTED) 0] ls /greetest
[test]

8．创建带序号的节点

（1）先创建一个普通的根节点/sanguo/weiguo

[zk: localhost:2181(CONNECTED) 12] create /greetest/seq ""
Created /greetest/seq

（2）创建带序号的节点

[zk: localhost:2181(CONNECTED) 13] create -s /greetest/seq/seqtest "seqnode_1"
Created /greetest/seq/seqtest0000000000

[zk: localhost:2181(CONNECTED) 1] create -s /greetest/seq/seqtest_2 "seqnode_2"
Created /greetest/seq/seqtest_20000000001

[zk: localhost:2181(CONNECTED) 2] create -s /greetest/seq/seqtest_3 "seqnode_3"
Created /greetest/seq/seqtest_30000000002

如果原来没有序号节点，序号从0开始依次递增。如果原节点下已有2个节点，则再排序时从2开始，以此类推。

9．修改节点数据值

[zk: localhost:2181(CONNECTED) 3] set /greetest/test "hbqtest-new"
cZxid = 0x900000134
ctime = Thu Apr 23 15:26:42 CST 2020
mZxid = 0x900000142
mtime = Thu Apr 23 15:51:59 CST 2020
pZxid = 0x900000134
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 11
numChildren = 0

修改后

[zk: localhost:2181(CONNECTED) 4] get /greetest/test
hbqtest-new
cZxid = 0x900000134
ctime = Thu Apr 23 15:26:42 CST 2020
mZxid = 0x900000142
mtime = Thu Apr 23 15:51:59 CST 2020
pZxid = 0x900000134
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 11
numChildren = 0

10．节点的值变化监听

（1）在ecs-az3-yc-0021主机上注册监听/greetest节点数据变化

[zk: localhost:2181(CONNECTED) 0] get /greetest watch
hbq
cZxid = 0x900000133
ctime = Thu Apr 23 15:24:54 CST 2020
mZxid = 0x900000133
mtime = Thu Apr 23 15:24:54 CST 2020
pZxid = 0x90000013c
cversion = 4
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 3
numChildren = 2

（2）在ecs-az3-yc-0020主机上修改/greetest节点的数据

[zk: localhost:2181(CONNECTED) 5] set /greetest "hbq-new"
cZxid = 0x900000133
ctime = Thu Apr 23 15:24:54 CST 2020
mZxid = 0x900000144
mtime = Thu Apr 23 16:12:26 CST 2020
pZxid = 0x90000013c
cversion = 4
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 2

（4）观察ecs-az3-yc-0021主机收到数据变化的监听

WATCHER::

WatchedEvent state:SyncConnected type:NodeDataChanged path:/greetest

11．节点的子节点变化监听（路径变化）

（1）在ecs-az3-yc-0021主机上注册监听/sanguo节点的子节点变化

[zk: localhost:2181(CONNECTED) 2] ls /greetest watch
[test-2, test, seq]
[zk: localhost:2181(CONNECTED) 3]
WATCHER::

WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/greetest

（2）在ecs-az3-yc-0020主机/sanguo节点上创建子节点

[zk: localhost:2181(CONNECTED) 8] create /greetest/test-3 "test-3"
Created /greetest/test-3

（3）观察ecs-az3-yc-0021主机收到子节点变化的监听

[zk: localhost:2181(CONNECTED) 3]
WATCHER::

WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/greetest

12．删除节点

[zk: localhost:2181(CONNECTED) 9] delete /greetest/test-3

13．递归删除节点

[zk: localhost:2181(CONNECTED) 15] rmr /greetest/test

14．查看节点状态

[zk: localhost:2181(CONNECTED) 17] stat /greetest
cZxid = 0x90000014f
ctime = Thu Apr 23 17:17:35 CST 2020
mZxid = 0x90000014f
mtime = Thu Apr 23 17:17:35 CST 2020
pZxid = 0x90000014f
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 3
numChildren = 0