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Created Zookeeper QuickStart (markdown)
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Zookeeper-QuickStart.md
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## 环境版本
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* 操作系统：CentOS release 6.6 (Final)
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* java版本: jdk1.8
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* zookeeper版本: zookeeper-3.4.11
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## 一、 安装jdk
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```
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此处省略
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```
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## 二、 安装zookeeper
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### 2.1 下载源码包，并解压
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官网下载地址：`http://www.apache.org/dyn/closer.cgi/zookeeper`
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```
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wget http://mirror.olnevhost.net/pub/apache/zookeeper/zookeeper-3.4.11/zookeeper-3.4.11.tar.gz
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tar zxvf zookeeper-3.4.11.tar.gz
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mv zookeeper-3.4.11 /usr/local/zookeeper
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```
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### 2.2 修改环境变量
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编辑 /etc/profile 文件, 在文件末尾添加以下环境变量配置:
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```
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# ZooKeeper Env
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export ZOOKEEPER_HOME=/usr/local/zookeeper
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export PATH=$PATH:$ZOOKEEPER_HOME/bin
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```
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运行以下命令使环境变量生效:
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` source /etc/profile `
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### 2.3 重命名配置文件
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初次使用 ZooKeeper 时,需要将$ZOOKEEPER_HOME/conf 目录下的 zoo_sample.cfg 重命名为 zoo.cfg, zoo.cfg
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```
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mv $ZOOKEEPER_HOME/conf/zoo_sample.cfg $ZOOKEEPER_HOME/conf/zoo.cfg
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```
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### 2.4 单机模式--修改配置文件
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创建目录`/usr/local/zookeeper/data` 和`/usr/local/zookeeper/logs`
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修改配置文件
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```
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tickTime=2000
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initLimit=10
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syncLimit=5
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dataDir=/usr/local/zookeeper/data
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dataLogDir=/usr/local/zookeeper/logs
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clientPort=2181
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```
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如果是多节点,配置文件中尾部增加
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```
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server.1=192.168.1.110:2888:3888
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server.2=192.168.1.111:2888:3888
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server.3=192.168.1.112:2888:3888
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```
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同时,增加
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```
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#master
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echo "1">/usr/local/zookeeper/data/myid
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#slave1
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echo "2">/usr/local/zookeeper/data/myid
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#slave2
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echo "3">/usr/local/zookeeper/data/myid
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```
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### 2.5 启动 ZooKeeper 服务
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```
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# cd /usr/local/zookeeper/zookeeper-3.4.11/bin
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# ./zkServer.sh start
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ZooKeeper JMX enabled by default
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Using config: /usr/local/zookeeper/zookeeper-3.4.11/bin/../conf/zoo.cfg
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Starting zookeeper ... STARTED
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zkServer.sh status
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ZooKeeper JMX enabled by default
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Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
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Mode: follower
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```
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### 2.6 验证zooKeeper服务
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服务启动完成后，可以使用 telnet 和 stat 命令验证服务器启动是否正常:
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```
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# telnet 127.0.0.1 2181
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Trying 127.0.0.1...
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Connected to 127.0.0.1.
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Escape character is '^]'.
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stat
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Zookeeper version: 3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
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Clients:
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/127.0.0.1:48430[0](queued=0,recved=1,sent=0)
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Latency min/avg/max: 0/0/0
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Received: 1
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Sent: 0
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Connections: 1
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Outstanding: 0
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Zxid: 0x0
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Mode: standalone
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Node count: 4
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Connection closed by foreign host.
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```
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### 2.7 停止 ZooKeeper 服务
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想要停止 ZooKeeper 服务, 可以使用如下命令:
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```
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# cd /usr/local/zookeeper/zookeeper-3.4.11/bin
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# ./zkServer.sh stop
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ZooKeeper JMX enabled by default
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Using config: /usr/local/zookeeper/zookeeper-3.4.11/bin/../conf/zoo.cfg
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Stopping zookeeper ... STOPPED
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```
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## 三、zk ui安装 (选装，页面查看zk的数据)
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### 拉取代码
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```
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#git clone https://github.com/DeemOpen/zkui.git
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```
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### 源码编译需要安装 maven
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```
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# wget http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo -O /etc/yum.repos.d/epel-apache-maven.repo
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#cd zkui/
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#yum install -y maven
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#mvn clean install
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```
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### 修改配置文件默认值
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```
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#vim config.cfg
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serverPort=9090 #指定端口
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zkServer=192.168.1.110:2181
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sessionTimeout=300000
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```
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### 启动程序至后台
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2.0-SNAPSHOT 会随软件的更新版本不同而不同，执行时请查看target 目录中真正生成的版本
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```
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nohup java -jar target/zkui-2.0-SNAPSHOT-jar-with-dependencies.jar &
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```
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### 用浏览器访问：
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`http://192.168.1.110:9090/`
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