zookeeper安装教程（伪分布式和分布式）
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伪分布式
创建环境目录
~ mkdir /home/conan/zoo/zk1
~ mkdir /home/conan/zoo/zk2
~ mkdir /home/conan/zoo/zk3
新建myid文件
~ echo “1” > /home/conan/zoo/zk1/myid
~ echo “2” > /home/conan/zoo/zk2/myid
~ echo “3” > /home/conan/zoo/zk3/myid
分别修改配置文件
修改：dataDir,clientPort
增加：集群的实例，server.X，”X”表示每个目录中的myid的值
~ vi /home/conan/toolkit/zookeeper345/conf/zk1.cfg
ckTime=2000
initLimit=10
syncLimit=5
dataDir=/home/conan/zoo/zk1
clientPort=2181
server.1=192.168.1.201:2888:3888
server.2=192.168.1.201:2889:3889
server.3=192.168.1.201:2890:3890
~ vi /home/conan/toolkit/zookeeper345/conf/zk2.cfg
ckTime=2000
initLimit=10
syncLimit=5
dataDir=/home/conan/zoo/zk2
clientPort=2182
server.1=192.168.1.201:2888:3888
server.2=192.168.1.201:2889:3889
server.3=192.168.1.201:2890:3890
~ vi /home/conan/toolkit/zookeeper345/conf/zk3.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/home/conan/zoo/zk3
clientPort=2183
server.1=192.168.1.201:2888:3888
server.2=192.168.1.201:2889:3889
server.3=192.168.1.201:2890:3890
3个节点的ZooKeeper集群配置完成，接下来我们的启动服务。
启动集群
~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh start zk1.cfg
~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh start zk2.cfg
~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh start zk3.cfg
~ jps
5422 QuorumPeerMain
5395 QuorumPeerMain
5463 QuorumPeerMain
5494 Jps
查看节点状态
~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk1.cfg
JMX enabled by default
Using config: /home/conan/toolkit/zookeeper345/bin/../conf/zk1.cfg
Mode: follower
~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk2.cfg
JMX enabled by default
Using config: /home/conan/toolkit/zookeeper345/bin/../conf/zk2.cfg
Mode: leader
~ /home/conan/toolkit/zookeeper345/bin/zkServer.sh status zk3.cfg
JMX enabled by default
Using config: /home/conan/toolkit/zookeeper345/bin/../conf/zk3.cfg
Mode: follower
我们可以看到zk2是leader，zk1和zk3是follower
查看ZooKeeper物理文件目录结构
~ tree -L 3 /home/conan/zoo
/home/conan/zoo
├── zk0
├── zk1
│ ├── myid
│ ├── version-2
│ │ ├── acceptedEpoch
│ │ ├── currentEpoch
│ │ ├── log.100000001
│ │ └── snapshot.0
│ └── zookeeper_server.pid
├── zk2
│ ├── myid
│ ├── version-2
│ │ ├── acceptedEpoch
│ │ ├── currentEpoch
│ │ ├── log.100000001
│ │ └── snapshot.0
│ └── zookeeper_server.pid
└── zk3
├── myid
├── version-2
│ ├── acceptedEpoch
│ ├── currentEpoch
│ ├── log.100000001
│ └── snapshot.100000000
└── zookeeper_server.pid
7 directories, 18 files
zookeeper命令行操作
我们通过客户端连接ZooKeeper的集群，我们可以任意的zookeeper是进行连接。
~ /home/conan/toolkit/zookeeper345/bin/zkCli.sh -server 192.168.1.201:2181
分布式
1.上传zk安装包
2.解压
3.在配置zookeeper之前，在集群中每一个节点上都配好主机名和所有节点的IP与主机名的 映射，关闭防火墙
4.配置（先在一台节点上配置）
4.1添加一个zoo.cfg配置文件
$ZOOKEEPER/conf
mv zoo_sample.cfg zoo.cfg
4.2修改配置文件（zoo.cfg） dataDir=/itcast/zookeeper-3.4.5/data server.1=itcast05:2888:3888 server.2=itcast06:2888:3888 server.3=itcast07:2888:38884.3在（dataDir=/itcast/zookeeper-3.4.5/data）创建一个myid文件，里面内容是server.N中的N（server.2里面内容为2） echo "1" > myid4.4将配置好的zk拷贝到其他节点 scp -r /itcast/zookeeper-3.4.5/ itcast06:/itcast/ scp -r /itcast/zookeeper-3.4.5/ itcast07:/itcast/4.5注意：在其他节点上一定要修改myid的内容 在itcast06应该讲myid的内容改为2 （echo "6" > myid） 在itcast07应该讲myid的内容改为3 （echo "7" > myid）4.启动集群
分别启动zk
./zkServer.sh start
查看集群节点状态
./zkServer.sh status
启动命令行客户端：
[root@itcast03 bin]# ./zkCli.sh -server itcast03:2181
zookeeper常见命令：
[zk: 192.168.1.201(CONNECTED) 1] help
ZooKeeper -server host:port cmd args
connect host:port
get path [watch]
ls path [watch]
set path data [version]
rmr path
delquota [-n|-b] path
quit
printwatches on|off
create [-s] [-e] path data acl
stat path [watch]
close
ls2 path [watch]
history
listquota path
setAcl path acl
getAcl path
sync path
redo cmdno
addauth scheme auth
delete path [version]
setquota -n|-b val path
ZooKeeper的结构，很像是目录结构，我们看到了像ls这样熟悉的命令。
ls,查看/目录内容
[zk: 192.168.1.201(CONNECTED) 1] ls /
[zookeeper]
create,创建一个znode节点
[zk: 192.168.1.201(CONNECTED) 2] create /node conan
Created /node
get,查看/node的数据信息
[zk: 192.168.1.201(CONNECTED) 4] get /node
conan
cZxid = 0x100000006
ctime = Mon Aug 12 05:32:49 CST 2013
mZxid = 0x100000006
mtime = Mon Aug 12 05:32:49 CST 2013
pZxid = 0x100000006
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 5
numChildren = 0
set,修改数据
[zk: 192.168.1.201(CONNECTED) 5] set /node fens.me
cZxid = 0x100000006
ctime = Mon Aug 12 05:32:49 CST 2013
mZxid = 0x100000007
mtime = Mon Aug 12 05:34:32 CST 2013
pZxid = 0x100000006
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
get,再查看/node的数据信息，已改为fens.me
[zk: 192.168.1.201(CONNECTED) 6] get /node
fens.me
cZxid = 0x100000006
ctime = Mon Aug 12 05:32:49 CST 2013
mZxid = 0x100000007
mtime = Mon Aug 12 05:34:32 CST 2013
pZxid = 0x100000006
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
delete,删除/node
[zk: 192.168.1.201(CONNECTED) 7] delete /node
[zk: 192.168.1.201(CONNECTED) 8] ls /
[zookeeper]
quit,退出客户端连接
[zk: 192.168.1.201(CONNECTED) 19] quit
Quitting…
2013-08-12 05:40:29,304 [myid:] - INFO [main:ZooKeeper@684] - Session: 0x1406f3c1ef90002 closed
2013-08-12 05:40:29,305 [myid:] - INFO [main-EventThread:ClientCnxn$EventThread@509] - EventThread shut down
用Java开发zookeeper：
package org.conan.zookeeper.demo;import java.io.IOException;import org.apache.zookeeper.CreateMode;import org.apache.zookeeper.KeeperException;import org.apache.zookeeper.WatchedEvent;import org.apache.zookeeper.Watcher;import org.apache.zookeeper.ZooDefs.Ids;import org.apache.zookeeper.ZooKeeper;public class BasicDemo1 { public static void main(String[] args) throws IOException, KeeperException, InterruptedException { // 创建一个与服务器的连接 ZooKeeper zk = new ZooKeeper("192.168.1.201:2181", 60000, new Watcher() { // 监控所有被触发的事件 public void process(WatchedEvent event) { System.out.println("EVENT:" + event.getType()); } }); // 查看根节点 System.out.println("ls / => " + zk.getChildren("/", true)); // 创建一个目录节点 if (zk.exists("/node", true) == null) { zk.create("/node", "conan".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); System.out.println("create /node conan"); // 查看/node节点数据 System.out.println("get /node => " + new String(zk.getData("/node", false, null))); // 查看根节点 System.out.println("ls / => " + zk.getChildren("/", true)); } // 创建一个子目录节点 if (zk.exists("/node/sub1", true) == null) { zk.create("/node/sub1", "sub1".getBytes(), Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT); System.out.println("create /node/sub1 sub1"); // 查看node节点 System.out.println("ls /node => " + zk.getChildren("/node", true)); } // 修改节点数据 if (zk.exists("/node", true) != null) { zk.setData("/node", "changed".getBytes(), -1); // 查看/node节点数据 System.out.println("get /node => " + new String(zk.getData("/node", false, null))); } // 删除节点 if (zk.exists("/node/sub1", true) != null) { zk.delete("/node/sub1", -1); zk.delete("/node", -1); // 查看根节点 System.out.println("ls / => " + zk.getChildren("/", true)); } // 关闭连接 zk.close(); }}运行结果：
2013-08-12 15:33:29,699 [myid:] - INFO [main:Environment@97] - Client environment:zookeeper.version=3.3.1-942149, built on 05/07/2010 17:14 GMT
2013-08-12 15:33:29,702 [myid:] - INFO [main:Environment@97] - Client environment:host.name=PC201304202140
2013-08-12 15:33:29,702 [myid:] - INFO [main:Environment@97] - Client environment:java.version=1.6.0_45
2013-08-12 15:33:29,702 [myid:] - INFO [main:Environment@97] - Client environment:java.vendor=Sun Microsystems Inc.
2013-08-12 15:33:29,702 [myid:] - INFO [main:Environment@97] - Client environment:java.home=D:\toolkit\java\jdk6\jre
2013-08-12 15:33:29,703 [myid:] - INFO [main:Environment@97] - Client environment:java.class.path=D:\workspace\java\zkdemo\target\classes;C:\Users\Administrator.m2\repository\org\apache\hadoop\zookeeper\3.3.1\zookeeper-3.3.1.jar;C:\Users\Administrator.m2\repository\log4j\log4j\1.2.15\log4j-1.2.15.jar;C:\Users\Administrator.m2\repository\javax\mail\mail\1.4\mail-1.4.jar;C:\Users\Administrator.m2\repository\javax\activation\activation\1.1\activation-1.1.jar;C:\Users\Administrator.m2\repository\jline\jline\0.9.94\jline-0.9.94.jar;C:\Users\Administrator.m2\repository\junit\junit\3.8.1\junit-3.8.1.jar
2013-08-12 15:33:29,703 [myid:] - INFO [main:Environment@97] - Client environment:java.library.path=D:\toolkit\java\jdk6\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;D:\toolkit\Rtools\bin;D:\toolkit\Rtools\gcc-4.6.3\bin;C:\Program Files (x86)\Common Files\NetSarang;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;D:\toolkit\Git\cmd;D:\toolkit\Git\bin;C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;c:\Program Files (x86)\Common Files\Ulead Systems\MPEG;C:\Program Files (x86)\QuickTime\QTSystem\;D:\toolkit\MiKTex\miktex\bin\x64\;D:\toolkit\sshclient;D:\toolkit\ant19\bin;D:\toolkit\eclipse;D:\toolkit\gradle15\bin;D:\toolkit\java\jdk6\bin;D:\toolkit\maven3\bin;D:\toolkit\mysql56\bin;D:\toolkit\python27;D:\toolkit\putty;C:\Program Files\R\R-3.0.1\bin\x64;D:\toolkit\mongodb243\bin;D:\toolkit\php54;D:\toolkit\nginx140;D:\toolkit\nodejs;D:\toolkit\npm12\bin;D:\toolkit\java\jdk6\jre\bin\server;.
2013-08-12 15:33:29,703 [myid:] - INFO [main:Environment@97] - Client environment:java.io.tmpdir=C:\Users\ADMINI~1\AppData\Local\Temp\
2013-08-12 15:33:29,704 [myid:] - INFO [main:Environment@97] - Client environment:java.compiler=
2013-08-12 15:33:29,704 [myid:] - INFO [main:Environment@97] - Client environment:os.name=Windows 7
2013-08-12 15:33:29,704 [myid:] - INFO [main:Environment@97] - Client environment:os.arch=amd64
2013-08-12 15:33:29,705 [myid:] - INFO [main:Environment@97] - Client environment:os.version=6.1
2013-08-12 15:33:29,705 [myid:] - INFO [main:Environment@97] - Client environment:user.name=Administrator
2013-08-12 15:33:29,705 [myid:] - INFO [main:Environment@97] - Client environment:user.home=C:\Users\Administrator
2013-08-12 15:33:29,706 [myid:] - INFO [main:Environment@97] - Client environment:user.dir=D:\workspace\java\zkdemo
2013-08-12 15:33:29,707 [myid:] - INFO [main:ZooKeeper@373] - Initiating client connection, connectString=192.168.1.201:2181 sessionTimeout=60000 watcher=org.conan.zookeeper.demo.BasicDemo1
2013-08-12 15:33:38,736 [myid:] - INFO [main-SendThread(192.168.1.201:2181):ClientCnxn
EVENT:None
ls / => [zookeeper]
EVENT:NodeCreated
EVENT:NodeChildrenChanged
create /node conan
get /node => conan
ls / => [node, zookeeper]
EVENT:NodeCreated
create /node/sub1 sub1
ls /node => [sub1]
EVENT:NodeDataChanged
get /node => changed
EVENT:NodeDeleted
EVENT:NodeChildrenChanged
EVENT:NodeChildrenChanged
ls / => [zookeeper]
2013-08-12 15:33:38,877 [myid:] - INFO [main:ZooKeeper@538] - Session: 0x1406f3c1ef9000d closed
pom.xml，maven配置文件
<?xml version="1.0" encoding="UTF-8"?><projectxsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><modelVersion>4.0.0</modelVersion><groupId>org.conan.zookeeper</groupId><artifactId>zkdemo</artifactId><version>0.0.1</version><name>zkdemo</name><description>zkdemo</description><dependencies> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>zookeeper</artifactId> <version>3.3.1</version> <exclusions> <exclusion> <groupId>javax.jms</groupId> <artifactId>jms</artifactId> </exclusion> <exclusion> <groupId>com.sun.jdmk</groupId> <artifactId>jmxtools</artifactId> </exclusion> <exclusion> <groupId>com.sun.jmx</groupId> <artifactId>jmxri</artifactId> </exclusion> </exclusions> </dependency></dependencies></project>Zoo.cfg中配置参数含义：
zookeeper的默认配置文件为zookeeper/conf/zoo_sample.cfg，需要将其修改为zoo.cfg。其中各配置项的含义，解释如下：
1.tickTime：CS通信心跳时间
Zookeeper 服务器之间或客户端与服务器之间维持心跳的时间间隔，也就是每个 tickTime 时间就会发送一个心跳。tickTime以毫秒为单位。
tickTime=2000
2.initLimit：LF初始通信时限
集群中的follower服务器(F)与leader服务器(L)之间初始连接时能容忍的最多心跳数（tickTime的数量）。
initLimit=5
3.syncLimit：LF同步通信时限
集群中的follower服务器与leader服务器之间请求和应答之间能容忍的最多心跳数（tickTime的数量）。
syncLimit=2
4.dataDir：数据文件目录
Zookeeper保存数据的目录，默认情况下，Zookeeper将写数据的日志文件也保存在这个目录里。
dataDir=/home/michael/opt/zookeeper/data
5.clientPort：客户端连接端口
客户端连接 Zookeeper 服务器的端口，Zookeeper 会监听这个端口，接受客户端的访问请求。
clientPort=2181
6.服务器名称与地址：集群信息（服务器编号，服务器地址，LF通信端口，选举端口）
这个配置项的书写格式比较特殊，规则如下：
server.N=YYY:A:B
server.1=itcast05:2888:3888
server.2=itcast06:2888:3888
server.3=itcast07:2888:3888
zookeeper客户端启动报错：
EndOfStreamException: Unable to read additional data from client sessionid 0x0, likely client has closed socket
at org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:220)
at org.apache.zookeeper.server.NIOServerCnxnFactory.run(NIOServerCnxnFactory.java:208)
at java.lang.Thread.run(Thread.java:745)
问题：
配置的超时时间太短，Zookeeper没有读完Consumer的数据，连接就被Consumer断开了
解决：
在config/server.properties文件中将超时连接属性的值调大一点，如下：
1.zookeeper.session.timeout.ms=400000
注：也可以在java代码中设置！
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