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分布式注册中心（链接）需要安装的组件包含两个部分：
1、注册中心服务(Zookeeper)
2、网站(Tomcat服务器)
此文档摘自分布式注册中心安装部署的Part-1安装环境：
[root@localhost etc]# cat/etc/redhat-release
RedHat Enterprise Linux Server release 7.0 (Maipo)
[root@localhost etc]# uname -a
Linuxlocalhost.localdomain 3.10.0-123.el7.x86_64 #1 SMP Mon May 5 11:16:57 EDT 2014x86_64 x86_64 x86_64 GNU/Linux
[root@localhost etc]#
备注：CentOS预计也一样
一、安装JDK
Tomcat服务器的运行和Zookeeper服务的运行都依赖于JRE。
二、安装Zookeeper
步骤1：解压
[root@localhost uRegister]# tar –zxvf zookeeper-3.4.8.tar.gz
步骤2：创建数据和日志存放目录
[root@localhost uRegister]# mkdir zkData zkLog
步骤3：创建/uRegister/zookeeper-3.4.8/conf/zoo.cfg配置文件
[root@localhost conf]#touch zoo.cfg
内容如下：
dataDir=/uRegister/zkData
dataLogDir=/uRegister/zkLog
clientPort=2181
tickTime=2000
步骤4：打开防火墙端口
[root@localhost bin]# firewall-cmd --add-port=2181/tcp --permanent
success
[root@localhost bin]# firewall-cmd --reload
success
步骤5：启动
启动Zookeeper服务命令：
[root@localhost bin]# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config:/uRegister/zookeeper-3.4.8/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
用jps名录看Zookeeper服务QuorumPeerMain是否在运行：
[root@localhost bin]# jps
13103 Jps
13065 QuorumPeerMain
10899 Bootstrap
还可以查看Zookeeper服务运行状态：
[root@localhost bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config:/uRegister/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: standalone
停止Zookeeper服务的命令是：
[root@localhost bin]# ./zkServer.sh stop
ZooKeeper JMX enabled by default
Using config: /uRegister/zookeeper-3.4.8/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
[root@localhost bin]#
步骤6：测试连接：
[root@localhost bin]# ./zkCli.sh -server 192.104.103.170:2181
Connecting to 192.104.103.170:2181
2016-03-24 09:27:26,562 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.8--1,built on 02/06/2016 03:18 GMT
2016-03-24 09:27:26,565 [myid:] - INFO [main:Environment@100] - Client environment:host.name=localhost
2016-03-24 09:27:26,565 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.7.0_51
2016-03-24 09:27:26,568 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=OracleCorporation
2016-03-24 09:27:26,568 [myid:] - INFO [main:Environment@100] - Clientenvironment:java.home=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.51-2.4.5.5.el7.x86_64/jre
2016-03-24 09:27:26,568 [myid:] - INFO [main:Environment@100] - Clientenvironment:java.class.path=/uRegister/zookeeper-3.4.8/bin/../build/classes:/uRegister/zookeeper-3.4.8/bin/../build/lib/*.jar:/uRegister/zookeeper-3.4.8/bin/../lib/slf4j-log4j12-1.6.1.jar:/uRegister/zookeeper-3.4.8/bin/../lib/slf4j-api-1.6.1.jar:/uRegister/zookeeper-3.4.8/bin/../lib/netty-3.7.0.Final.jar:/uRegister/zookeeper-3.4.8/bin/../lib/log4j-1.2.16.jar:/uRegister/zookeeper-3.4.8/bin/../lib/jline-0.9.94.jar:/uRegister/zookeeper-3.4.8/bin/../zookeeper-3.4.8.jar:/uRegister/zookeeper-3.4.8/bin/../src/java/lib/*.jar:/uRegister/zookeeper-3.4.8/bin/../conf:
2016-03-24 09:27:26,568 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2016-03-24 09:27:26,568 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2016-03-24 09:27:26,569 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA>
2016-03-24 09:27:26,569 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux
2016-03-24 09:27:26,569 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=amd64
2016-03-24 09:27:26,569 [myid:] - INFO [main:Environment@100] - Clientenvironment:os.version=3.10.0-123.el7.x86_64
2016-03-24 09:27:26,569 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root
2016-03-24 09:27:26,569 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root
2016-03-24 09:27:26,569 [myid:] - INFO [main:Environment@100] - Clientenvironment:user.dir=/uRegister/zookeeper-3.4.8/bin
2016-03-24 09:27:26,571 [myid:] - INFO [main:ZooKeeper@438] - Initiating client connection, connectString=192.104.103.170:2181sessionTimeout=30000watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@511bfc28
Welcome to ZooKeeper!
2016-03-24 09:27:26,604 [myid:] - INFO [main-SendThread(192.104.103.170:2181):ClientCnxn$SendThread@1032] -Opening socket connection to server 192.104.103.170/192.104.103.170:2181. Willnot attempt to authenticate using SASL (unknown error)
2016-03-24 09:27:26,614 [myid:] - INFO [main-SendThread(192.104.103.170:2181):ClientCnxn$SendThread@876] -Socket connection established to 192.104.103.170/192.104.103.170:2181,initiating session
JLine support is enabled
2016-03-24 09:27:26,638 [myid:] - INFO [main-SendThread(192.104.103.170:2181):ClientCnxn$SendThread@1299] -Session establishment complete on server 192.104.103.170/192.104.103.170:2181,sessionid = 0x153a639b4560000, negotiated timeout = 30000
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[zk: 192.104.103.170:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: 192.104.103.170:2181(CONNECTED) 1]