在CentOS7上安装和使用ZooKeeper最新版本（V3.4.11）

0.ZooKeeper文档

http://zookeeper.apache.org/doc/r3.4.11/zookeeperOver.html


1.准备

在CentOS7上安装zookeeper时，如下工具必须要有：wget

如果没有，则进行安装：
yum -y install wget
2.下载安装
下载到本地
cd /usr/local/src wget
http://mirrors.hust.edu.cn/apache/zookeeper/zookeeper-3.4.11/zookeeper-3.4.11.tar.gz
解压
tar -xzvf zookeeper-3.4.11.tar.gz
创建的安装目录，并移动解压后的目录到其下
mkdir -p ../zookeeper mv zookeeper-3.4.11/ ../zookeeper
创建数据目录，用于存放数据
mkdir -p /var/lib/zookeeper
创建配置
cd ../zookeeper/zookeeper-3.4.11/conf cp zoo_sample.cfg zoo.cfg
修改其中配置dataDir：
vi zoo.cfg dataDir=/var/lib/zookeeper
3.启动服务
cd .. ./bin/zkServer.sh start
输出如下信息，表示启动成功
Connecting to 127.0.0.1:2181 2018-02-09 14:56:10,914 [myid:] - INFO
[main:Environment@100] - Client
environment:zookeeper.version=3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0,
built on 11/01/2017 18:06 GMT 2018-02-09 14:56:10,922 [myid:] - INFO
[main:Environment@100] - Client
environment:host.name=jiaodacailei-thinkpad-centos7 2018-02-09 14:56:10,922
[myid:] - INFO [main:Environment@100] - Client
environment:java.version=1.8.0_161 2018-02-09 14:56:10,927 [myid:] - INFO
[main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2018-02-09 14:56:10,927 [myid:] - INFO [main:Environment@100] - Client
environment:java.home=/usr/local/jdk/jdk1.8.0_161/jre 2018-02-09 14:56:10,927
[myid:] - INFO [main:Environment@100] - Client
environment:java.class.path=/usr/local/zookeeper/zookeeper-3.4.11/bin/../build/classes:/usr/local/zookeeper/zookeeper-3.4.11/bin/../build/lib/*.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/slf4j-api-1.6.1.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/netty-3.10.5.Final.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/log4j-1.2.16.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/jline-0.9.94.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../lib/audience-annotations-0.5.0.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../zookeeper-3.4.11.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../src/java/lib/*.jar:/usr/local/zookeeper/zookeeper-3.4.11/bin/../conf::/usr/local/jdk/jdk1.8.0_161/lib/dt.jar:/usr/local/jdk/jdk1.8.0_161/lib/tools.jar:/usr/local/jdk/jdk1.8.0_161/jre/lib/dt.jar
2018-02-09 14:56:10,927 [myid:] - INFO [main:Environment@100] - Client
environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2018-02-09 14:56:10,928 [myid:] - INFO [main:Environment@100] - Client
environment:java.io.tmpdir=/tmp 2018-02-09 14:56:10,928 [myid:] - INFO
[main:Environment@100] - Client environment:java.compiler=<NA> 2018-02-09
14:56:10,928 [myid:] - INFO [main:Environment@100] - Client
environment:os.name=Linux 2018-02-09 14:56:10,928 [myid:] - INFO
[main:Environment@100] - Client environment:os.arch=amd64 2018-02-09
14:56:10,928 [myid:] - INFO [main:Environment@100] - Client
environment:os.version=3.10.0-693.el7.x86_64 2018-02-09 14:56:10,929 [myid:] -
INFO [main:Environment@100] - Client environment:user.name=root 2018-02-09
14:56:10,929 [myid:] - INFO [main:Environment@100] - Client
environment:user.home=/root 2018-02-09 14:56:10,929 [myid:] - INFO
[main:Environment@100] - Client
environment:user.dir=/usr/local/zookeeper/zookeeper-3.4.11 2018-02-09
14:56:10,932 [myid:] - INFO [main:ZooKeeper@441] - Initiating client
connection, connectString=127.0.0.1:2181 sessionTimeout=30000
watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@579bb367 Welcome to
ZooKeeper! 2018-02-09 14:56:10,983 [myid:] - INFO
[main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1035] - Opening socket
connection to server 127.0.0.1/127.0.0.1:2181. Will not attempt to authenticate
using SASL (unknown error) JLine support is enabled 2018-02-09 14:56:11,141
[myid:] - INFO [main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@877] -
Socket connection established to 127.0.0.1/127.0.0.1:2181, initiating session
[zk: 127.0.0.1:2181(CONNECTING) 0] 2018-02-09 14:56:11,242 [myid:] - INFO
[main-SendThread(127.0.0.1:2181):ClientCnxn$SendThread@1302] - Session
establishment complete on server 127.0.0.1/127.0.0.1:2181, sessionid =
0x1000150f9ff0000, negotiated timeout = 30000 WATCHER:: WatchedEvent
state:SyncConnected type:None path:null
4.启动客户端
./bin/zkCli.sh -server 127.0.0.1:2181
输入如下，等待用户输入命令：
[zk: 127.0.0.1:2181(CONNECTED) 0]
5.获取帮助

输入如下命令，可以获取帮助信息：
help
输出信息如下：
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上面是所有可以使用的命令


6.ls命令
ls /
默认根节点下有一个zookeeper节点
[zookeeper]
7.创建节点

创建节点采用create命令，创建之后查看根路径，发现多了一个节点；

通过get命令，可以查询节点路径对应的数据
[zk: 127.0.0.1:2181(CONNECTED) 4] create /zk_test test_data Created /zk_test
[zk: 127.0.0.1:2181(CONNECTED) 6] ls / [zookeeper, zk_test][zk:
127.0.0.1:2181(CONNECTED) 7] get /zk_test test_data cZxid = 0x2 ctime = Fri Feb
09 15:19:11 CST 2018 mZxid = 0x2 mtime = Fri Feb 09 15:19:11 CST 2018 pZxid =
0x2 cversion = 0 dataVersion = 0 aclVersion = 0 ephemeralOwner = 0x0 dataLength
= 9 numChildren = 0
8.修改节点数据

set命令可以修改路径对应的节点数据，修改后再通过get命令查看结果
[zk: 127.0.0.1:2181(CONNECTED) 8] set /zk_test test_data_changecZxid = 0x2
ctime = Fri Feb 09 15:19:11 CST 2018 mZxid = 0x3 mtime = Fri Feb 09 15:21:31
CST 2018 pZxid = 0x2 cversion = 0 dataVersion = 1 aclVersion = 0 ephemeralOwner
= 0x0 dataLength = 16 numChildren = 0[zk: 127.0.0.1:2181(CONNECTED) 10] get
/zk_testtest_data_change cZxid = 0x2 ctime = Fri Feb 09 15:19:11 CST 2018 mZxid
= 0x3 mtime = Fri Feb 09 15:21:31 CST 2018 pZxid = 0x2 cversion = 0 dataVersion
= 1 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 16 numChildren = 0
9.删除节点

delete命令可以删除路径对应的节点，删除之后，通过ls命令查看其父路径，可以看到节点已经减少一个
[zk: 127.0.0.1:2181(CONNECTED) 11] delete /zk_test [zk:
127.0.0.1:2181(CONNECTED) 12] ls / [zookeeper]10.退出客户端
quit
11.停止服务
./bin/zkServer.sh stop

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