zookeeper 三节点部署

## 环境

|节点名|IP|
|-|-|
|zk01|10.15.4.244|
|zk02|10.15.4.245|
|zk03|10.15.4.138|

|依赖|版本|
|-|-|
|Linux Server| Centos 9 |
|JDK | yum install java-11-openjdk|
|ZooKeeper|3.8.1|

## 部署

每个节点均需操作

创建相关目录
```bash
mkdir /root/zookeeper
mkdir /root/zookeeper/data
mkdir /root/zookeeper/logs
```

下载 zookeeper
```bash
cd /root/zookeeper
wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.8.1/apache-zookeeper-3.8.1-bin.tar.gz
tar zxvf apache-zookeeper-3.8.1-bin.tar.gz
```

修改环境变量
```bash
vim ~/.bashrc

# 添加以下下内容

# zookeeper
export ZOOKEEPER_HOME=/root/zookeeper/apache-zookeeper-3.8.1-bin
export PATH=$ZOOKEEPER_HOME/bin:$PATH

# 使环境变量生效
source ~/.bashrc
```

新建配置文件
```bash
cd /root/zookeeper/apache-zookeeper-3.8.1-bin/conf
touch zoo.cfg

# 添加以下内容
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/root/zookeeper/data
dataLogDir=/root/zookeeper/logs
clientPort=2181
server.1=10.15.4.244:2888:3888
server.2=10.15.4.245:2888:3888
server.3=10.15.4.138:2888:3888
```

配置节点标识
```bash
# zk01
echo "1" > /root/zookeeper/data/myid

# zk02
echo "2" > /root/zookeeper/data/myid

# zk03
echo "3" > /root/zookeeper/data/myid
```

防火墙
```bash
#开放端口
firewall-cmd --add-port=2181/tcp --permanent
firewall-cmd --add-port=2888/tcp --permanent
firewall-cmd --add-port=3888/tcp --permanent

#重新加载防火墙配置
firewall-cmd --reload
```

启动 zookeeper
```bash
#进入ZooKeeper bin目录
cd $ZOOKEEPER_HOME/bin

#启动
./zkServer.sh start
```

出现以下字样，则启动成功
```
[root@linkapp-ext bin]# ./zkServer.sh start
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /root/zookeeper/apache-zookeeper-3.8.1-bin/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
```

## 测试

查看节点状态
```bash
[root@linkapp-ext bin]# sh $ZOOKEEPER_HOME/bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /root/zookeeper/apache-zookeeper-3.8.1-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: leader
```

客户端链接测试(这里随机选其中一个节点作为客户端连接其他节点即可)
```
# 指定Server进行连接
sh $ZOOKEEPER_HOME/bin/zkCli.sh -server 10.15.4.138:2181

# 正常连接后会进入ZooKeeper命令行，显示如下：
[zk: 10.15.4.138:2181(CONNECTED) 0]

# 输入命令测试
[zk: 10.15.4.138:2181(CONNECTED) 0] ls /
[zookeeper]
```

## 配置说明

## 附录

https://ken.io/note/zookeeper-cluster-deploy-guide
https://zookeeper.apache.org/doc/current/zookeeperStarted.html

逆风起笔