3.Zookeeper安装配置

一、主机配置

（一）创建hadoop用户

说明：由于目标端hadoop集群已创建，无需再次创建此用户。

[root@s142133 ~]# useradd -m hadoop -s /bin/bash 
[root@s142133 ~]# id hadoop uid=54322(hadoop) gid=54331(hadoop) groups=54331(hadoop) 
[root@s142133 ~]# passwd hadoop
Changing password for user hadoop. 
New password: 
BAD PASSWORD: The password is shorter than 8 characters 
Retype new password: 
passwd: all authentication tokens updated successfully.

（二）安装Java环境

Java环境可选择Oracle 的JDK，或是OpenJDK，现在一般Linux系统默认安装的基本是OpenJDK，如RedHat7.4 默认安装了OpenJDK 1.8，如下：

[hadoop@s142133 ~]$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.4 (Maipo) 
[hadoop@s142133 ~]$ java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-b12)
OpenJDK 64-Bit Server VM (build 25.131-b12, mixed mode)

1.JDK下载安装

自行下载jdk安装包，手动安装JDK1.8：

[hadoop@s142133 ~]$ ls -ltr jdk-8u221-linux-x64.tar.gz
-rw-r--r-- 1 oracle oinstall 153530841 Aug 12 10:38 jdk-8u221-linux-x64.tar.gz
[hadoop@s142133 ~]$ tar -xvf jdk-8u221-linux-x64.tar.gz
[hadoop@s142133 ~]$ mv jdk1.8.0_221 jdk8

2.配置环境变量

export JAVA_HOME=/home/hadoop/jdk8
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$CLASSPATH
export PATH=$JAVA_HOME/bin:$PATH

3.检验JDK信息

[hadoop@s142133 ~]$ source .bash_profile
[hadoop@s142133 ~]$ java -version
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)

二、Zookeeper安装及配置

说明：在一台机器上模拟3个 zk server的集群安装。

（一）下载并解压软件

说明：解压到3个目录

[hadoop@s142133 ~]$ ls -ltr zookeeper-3.4.6.tar.gz
-rw-r--r-- 1 hadoop hadoop 17699306 Feb 25  2016 zookeeper-3.4.6.tar.gz
[hadoop@s142133 ~]$ tar -xvf zookeeper-3.4.6.tar.gz
[hadoop@s142133 ~]$ mkdir zookeeper
[hadoop@s142133 ~]$ mv zookeeper-3.4.6 zookeeper/zookeeper-1
[hadoop@s142133 ~]$ cp -r zookeeper/zookeeper-1 zookeeper/zookeeper-2
[hadoop@s142133 ~]$ cp -r zookeeper/zookeeper-1 zookeeper/zookeeper-3
[hadoop@s142133 ~]$ ls -ltr zookeeper/
total 12
drwxr-xr-x 10 hadoop hadoop 4096 Feb 20  2014 zookeeper-1
drwxr-xr-x 10 hadoop hadoop 4096 Aug 17 00:55 zookeeper-2
drwxr-xr-x 10 hadoop hadoop 4096 Aug 17 00:55 zookeeper-3

（二）修改配置文件

注意：clientPort分别设置为2181、2182、2183

1.zk节点1配置

[hadoop@s142133 ~]$ vi /home/hadoop/zookeeper/zookeeper-1/conf/zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/home/hadoop/zookeeper/zookeeper-1/data
dataLogDir=/home/hadoop/zookeeper/zookeeper-1/log
clientPort=2181
server.1=localhost:2287:3387
server.2=localhost:2288:3388
server.3=localhost:2289:3389

2.zk节点2配置

[hadoop@s142133 ~]$ vi /home/hadoop/zookeeper/zookeeper-2/conf/zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/home/hadoop/zookeeper/zookeeper-2/data
dataLogDir=/home/hadoop/zookeeper/zookeeper-2/log
clientPort=2182
server.1=localhost:2287:3387
server.2=localhost:2288:3388
server.3=localhost:2289:3389

3.zk节点3配置

[hadoop@s142133 ~]$ vi /home/hadoop/zookeeper/zookeeper-3/conf/zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/home/hadoop/zookeeper/zookeeper-3/data
dataLogDir=/home/hadoop/zookeeper/zookeeper-3/log
clientPort=2183
server.1=localhost:2287:3387
server.2=localhost:2288:3388
server.3=localhost:2289:3389

（三）创建数据、日志目录

手动创建dataDir、dataLogDir对应的目录，3个节点都需创建。

1.zk节点1创建目录

[hadoop@s142133 ~]$ mkdir -p /home/hadoop/zookeeper/zookeeper-1/data
[hadoop@s142133 ~]$ mkdir -p /home/hadoop/zookeeper/zookeeper-1/log

2.zk节点2创建目录

[hadoop@s142133 ~]$ mkdir -p /home/hadoop/zookeeper/zookeeper-2/data
[hadoop@s142133 ~]$ mkdir -p /home/hadoop/zookeeper/zookeeper-2/log

3.zk节点3创建目录

[hadoop@s142133 ~]$ mkdir -p /home/hadoop/zookeeper/zookeeper-3/data
[hadoop@s142133 ~]$ mkdir -p /home/hadoop/zookeeper/zookeeper-3/log

（四）创建myid文件

说明：在每个zk server配置文件的dataDir对应的目录下，创建一个名为myid的文件，其中的内容必须与zoo.cfg中server.x 中的x相同，即：

/home/hadoop/zookeeper/zookeeper-1/data/myid 中的内容为1，对应server.1中的1

[hadoop@s142133 ~]$ cat /home/hadoop/zookeeper/zookeeper-1/data/myid
1

/home/hadoop/zookeeper/zookeeper-2/data/myid 中的内容为2，对应server.2中的2

[hadoop@s142133 ~]$ cat /home/hadoop/zookeeper/zookeeper-2/data/myid
2

/home/hadoop/zookeeper/zookeeper-3/data/myid 中的内容为3，对应server.3中的3

[hadoop@s142133 ~]$ cat /home/hadoop/zookeeper/zookeeper-3/data/myid
3

（五）启动zookeeper集群

[hadoop@s142133 ~]$ /home/hadoop/zookeeper/zookeeper-1/bin/zkServer.sh start
JMX enabled by default
Using config: /home/hadoop/zookeeper/zookeeper-1/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[hadoop@s142133 ~]$ /home/hadoop/zookeeper/zookeeper-2/bin/zkServer.sh start
JMX enabled by default
Using config: /home/hadoop/zookeeper/zookeeper-2/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[hadoop@s142133 ~]$ /home/hadoop/zookeeper/zookeeper-3/bin/zkServer.sh start
JMX enabled by default
Using config: /home/hadoop/zookeeper/zookeeper-3/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

（六）zookeeper测试

1.启动客户端

[hadoop@s142133 ~]$ /home/hadoop/zookeeper/zookeeper-1/bin/zkCli.sh -server localhost:2181
Connecting to localhost:2181
2019-08-17 01:08:30,807 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
2019-08-17 01:08:30,816 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=s142133
2019-08-17 01:08:30,816 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.8.0_221
2019-08-17 01:08:30,819 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2019-08-17 01:08:30,819 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/home/hadoop/jdk8/jre
2019-08-17 01:08:30,819 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/home/hadoop/zookeeper/zookeeper-1/bin/../build/classes:/home/hadoop/zookeeper/zookeeper-1/bin/../build/lib/*.jar:/home/hadoop/zookeeper/zookeeper-1/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/hadoop/zookeeper/zookeeper-1/bin/../lib/slf4j-api-1.6.1.jar:/home/hadoop/zookeeper/zookeeper-1/bin/../lib/netty-3.7.0.Final.jar:/home/hadoop/zookeeper/zookeeper-1/bin/../lib/log4j-1.2.16.jar:/home/hadoop/zookeeper/zookeeper-1/bin/../lib/jline-0.9.94.jar:/home/hadoop/zookeeper/zookeeper-1/bin/../zookeeper-3.4.6.jar:/home/hadoop/zookeeper/zookeeper-1/bin/../src/java/lib/*.jar:/home/hadoop/zookeeper/zookeeper-1/bin/../conf:.:/home/hadoop/jdk8/lib/dt.jar:/home/hadoop/jdk8/lib/tools.jar
2019-08-17 01:08:30,820 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/home/hadoop/jdk8/jre/lib/amd64/server:/home/hadoop/jdk8/jre/lib/amd64:/home/hadoop/jdk8/jre/../lib/amd64::/home/hadoop/jdk8/jre/lib/amd64/libjsig.so:/home/hadoop/jdk8/jre/lib/amd64/server/libjvm.so:/home/hadoop/jdk8/jre/lib/amd64/server:/home/hadoop/jdk8/jre/lib/amd64:/bigdata/ogg:/lib:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2019-08-17 01:08:30,820 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2019-08-17 01:08:30,820 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2019-08-17 01:08:30,820 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2019-08-17 01:08:30,820 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2019-08-17 01:08:30,820 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.10.0-693.el7.x86_64
2019-08-17 01:08:30,821 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=hadoop
2019-08-17 01:08:30,821 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/home/hadoop
2019-08-17 01:08:30,821 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/home/hadoop/zookeeper/zookeeper-1/bin
2019-08-17 01:08:30,823 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@421faab1
Welcome to ZooKeeper!
JLine support is enabled
2019-08-17 01:08:30,959 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@975] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
2019-08-17 01:08:31,191 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@852] - Socket connection established to localhost/127.0.0.1:2181, initiating session
2019-08-17 01:08:31,304 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1235] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x16c9b6514ad0000, negotiated timeout = 30000
 
WATCHER::
 
WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0]

2.状态验证

[zk: localhost:2181(CONNECTED) 0]表示正常启动。