### 环境
三台Centos7
```bash
主机名 IP
n188 144.202.93.188
n19 144.202.80.19
n111 149.248.37.111
```
### 准备工作
#### 安装JDK1.8
https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
#### 配置JDK环境变量
```bash
$ tail -3 /etc/profile
export JAVA_HOME=/usr/local/jdk1.8
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
```
#### 查看JDK
```bash
$ java -version
java version "1.8.0_201"
Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)
```
#### 配置hosts
```bash
$ tail -3 /etc/hosts
144.202.93.188 n188
144.202.80.19 n19
149.248.37.111 n111
```
### 安装zookeeper
#### 下载zookeeper(三台配置一样)
http://zookeeper.apache.org/releases.html#download
#### 配置zookeeper(三台配置一样)
```bash
$ grep -v "^#" zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/opt/zookeeper/data
clientPort=2181
autopurge.purgeInterval=1
server.1=n188:2888:3888
server.2=n19:2888:3888
server.3=n111:2888:3888
```
#### 创建数据目录(三台机器一样)
```bash
$ mkdir -p /opt/zookeeper/{logs,data}
```
#### 配置myid
n188机器
```bash
$ echo 1 >/opt/zookeeper/data/myid
```
n19机器
```bash
$ echo 2 >/opt/zookeeper/data/myid
```
n111机器
```bash
$ echo 3 >/opt/zookeeper/data/myid
```
启动zookeeper
#### 查看三台集群状态
n188机器
```bash
$./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
Mode: follower
```
n19机器
```bash
$./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
Mode: leader
```
n111机器
```bash
$./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
Mode: follower
```
