zookeeper3.4.8伪集群安装
zookeeper3.4.8伪集群安装软件包：zookeeper-3.4.8.tar.gz
Java包：jdk-8u77-linux-x64.gz
平台：centos6.264位
在一台机器上安装3个伪zookeeper集群
server.1=localhost:2287:3390
server.2=localhost:2288:3388
server.3=localhost:2289:3389
安装过程：
首先安装jdk8
# mkdir /usr/lib/jdk（创建jdk安装目录）
# tar xf jdk-8u77-linux-x64.gz -C /usr/lib/jdk（解压jdk包）
# vim /etc/profile（设置环境变量）
在profile末尾添加下面环境变量
export JAVA_HOME=/usr/lib/jdk/jdk1.8.0_77
export JRE_HOME=/usr/lib/jdk/jdk1.8.0_77/jre
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=$CLASSPATH:.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
# source /etc/profile（让环境变量生效）
# java -version（查看java版本）
java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)
Jdk8安装成功后安装zookeeper
此处在同一台机器上模拟三个zookeeper集群节点，即叫伪集群
在真实环境部署时，只用把zoo.cfg中的localhost替换成真实节点的ip地址即可。
# mkdir -pv /home/hadoop/{zookeeper-1,zookeeper-2,zookeeper-3} （创建目录）
# mkdir -pv /home/hadoop/tmp/{zk1/data,zk1/log,zk2/data,zk2/log,zk3/data,zk3/log} （创建目录）
#tar xf zookeeper-3.4.8.tar.gz （解压zookeeper包）
把解压的文件复制到不同的目录中
#cp -r zookeeper-3.4.8/* /home/hadoop/zookeeper-1/
#cp -r zookeeper-3.4.8/* /home/hadoop/zookeeper-1/
#cp -r zookeeper-3.4.8/* /home/hadoop/zookeeper-1/
# cd /home/hadoop/zookeeper-1/conf/
#vim zoo.cfg （创建配置文件）
在zoo.cfg添加如下内容
clientPort=2181 （客户端连接服务器的端口号）
tickTime=2000 （服务器心跳时间ms）
initLimit=10 （投票选举新leader的初始化时间）
syncLimit=5 （leader与follower最大响应时间）
dataDir=/home/hadoop/tmp/zk1/data （数据存放目录）
dataLogDir=/home/hadoop/tmp/zk1/log （日志存放目录）
server.1=localhost:2287:3390
server.2=localhost:2288:3388
server.3=localhost:2289:3389
# cd /home/hadoop/zookeeper-2/conf/
#vim zoo.cfg
clientPort=2182
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/home/hadoop/tmp/zk2/data
dataLogDir=/home/hadoop/tmp/zk2/log
server.1=localhost:2287:3390
server.2=localhost:2288:3388
server.3=localhost:2289:3389
# cd /home/hadoop/zookeeper-3/conf/
#mv zoo_sample.cfg zoo.cfg
#vim zoo.cfg
clientPort=2183
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/home/hadoop/tmp/zk3/data
dataLogDir=/home/hadoop/tmp/zk3/log
server.1=localhost:2287:3390
server.2=localhost:2288:3388
server.3=localhost:2289:3389
分别在zookeeper的数据目录创建myid，myid的内容为zoo.cfg配置文件中server.1中的1，2，或3
#echo “1” > /home/hadoop/tmp/zk1/data/myid
#echo “2” > /home/hadoop/tmp/zk2/data/myid
#echo “3” > /home/hadoop/tmp/zk3/data/myid
#/home/hadoop/zookeeper-1/bin/zkServer.sh start （启动zookeeper）
#/home/hadoop/zookeeper-2/bin/zkServer.sh start
#/home/hadoop/zookeeper-3/bin/zkServer.sh start
# ss -tnl
0 50 *:2181 *:*
0 50 *:2182 *:*
0 50 *:2183 *:*
测试连接zookeeper
#/home/hadoop/zookeeper-1/bin/zkCli.sh -server localhost:2181
Connecting to localhost:2181
2016-04-07 12:29:35,556 - INFO - Client environment:zookeeper.version=3.4.8--1, built on 02/06/2016 03:18 GMT
2016-04-07 12:29:35,564 - INFO - Client environment:host.name=pc0.zz.ha.cn
2016-04-07 12:29:35,564 - INFO - Client environment:java.version=1.8.0_77
2016-04-07 12:29:35,568 - INFO - Client environment:java.vendor=Oracle Corporation
2016-04-07 12:29:35,568 - INFO - Client environment:java.home=/usr/lib/jdk/jdk1.8.0_77/jre
2016-04-07 12:29:35,568 - INFO - Client environment:java.class.path=/home/hadoop/zookeeper-3/bin/../build/classes:/home/hadoop/zookeeper-3/bin/../build/lib/*.jar:/home/hadoop/zookeeper-3/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/hadoop/zookeeper-3/bin/../lib/slf4j-api-1.6.1.jar:/home/hadoop/zookeeper-3/bin/../lib/netty-3.7.0.Final.jar:/home/hadoop/zookeeper-3/bin/../lib/log4j-1.2.16.jar:/home/hadoop/zookeeper-3/bin/../lib/jline-0.9.94.jar:/home/hadoop/zookeeper-3/bin/../zookeeper-3.4.8.jar:/home/hadoop/zookeeper-3/bin/../src/java/lib/*.jar:/home/hadoop/zookeeper-3/bin/../conf::.:/usr/lib/jdk/jdk1.8.0_77/lib:/usr/lib/jdk/jdk1.8.0_77/jre/lib
2016-04-07 12:29:35,568 - INFO - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2016-04-07 12:29:35,569 - INFO - Client environment:java.io.tmpdir=/tmp
2016-04-07 12:29:35,569 - INFO - Client environment:java.compiler=
2016-04-07 12:29:35,569 - INFO - Client environment:os.name=Linux
2016-04-07 12:29:35,569 - INFO - Client environment:os.arch=amd64
2016-04-07 12:29:35,569 - INFO - Client environment:os.version=2.6.32-220.4.1.el6.centos.plus.x86_64
2016-04-07 12:29:35,569 - INFO - Client environment:user.name=root
2016-04-07 12:29:35,569 - INFO - Client environment:user.home=/root
2016-04-07 12:29:35,570 - INFO - Client environment:user.dir=/home/hadoop/tmp/zk1/data
2016-04-07 12:29:35,572 - INFO - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@67424e82
Welcome to ZooKeeper!
2016-04-07 12:29:35,624 - INFO - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2016-04-07 12:29:35,746 - INFO - Socket connection established to localhost/127.0.0.1:2181, initiating session
2016-04-07 12:29:35,812 - INFO - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x153eededdb50001, negotiated timeout = 30000
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
help
ZooKeeper -server host:port cmd args
stat path
set path data
ls path
delquota [-n|-b] path
ls2 path
setAcl path acl
setquota -n|-b val path
history
redo cmdno
printwatches on|off
delete path
sync path
listquota path
rmr path
get path
create [-s] [-e] path data acl
addauth scheme auth
quit
getAcl path
close
connect host:port
到此zookeeper安装成功。
查看zookeeper状态
# zookeeper-1/bin/zkServer.sh status
JMX enabled by default
Using config: /home/hadoop/zookeeper-1/bin/../conf/zoo.cfg
Mode: follower
# zookeeper-2/bin/zkServer.sh status
JMX enabled by default
Using config: /home/hadoop/zookeeper-2/bin/../conf/zoo.cfg
Mode: leader
# zookeeper-3/bin/zkServer.sh status
JMX enabled by default
Using config: /home/hadoop/zookeeper-3/bin/../conf/zoo.cfg
Mode: follower
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