Zookeeper

本文尝试在单机搭建包含有3个节点的Zookeeper集群。
环境：Windows 11 WSL2
Linux发行版本：Ubuntu 22.04.2 LTS

1 启动单个Zookeeper实例

1.1 下载Zookeeper安装包并解压

wget https://dlcdn.apache.org/zookeeper/zookeeper-3.8.3/apache-zookeeper-3.8.3-bin.tar.gz
sudo tar xvf apache-zookeeper-3.8.3-bin.tar.gz -C /usr/local/bin

1.2 添加环境变量

配置环境变量：

vim ~/.bashrc

添加如下内容：

#set Zookeeper env vars
export ZOOKEEPER_HOME=/usr/local/bin/apache-zookeeper-3.8.3-bin
export PATH=$PATH:$ZOOKEEPER_HOME/bin

加载新的环境变量：

source ~/.bashrc

1.3 修改默认配置

cd $ZOOKEEPER_HOME/conf
cp zoo_sample.cfg zoo.cfg
vim zoo.cfg

在配置文件中修改数据存储目录：

dataDir=$ZOOKEEPER_HOME/data

1.4 新建数据存储目录和日志目录

sudo mkdir $ZOOKEEPER_HOME/data
sudo chmod -R 777 data
sudo mkdir $ZOOKEEPER_HOME/logs
sudo chmod -R 777 logs

1.5 启动Zookeeper

zkServer.sh start

查看状态：

zkServer.sh status

启动命令行：

zkCli.sh

1.6 停止Zookeeper

停止Zookeeper

zkServer.sh stop

2 搭建Zookeeper集群

2.1 新建集群目录

cd /usr/local/bin
sudo zookeeper-cluster
chmod -R 777 zookeeper-cluster

2.2 配置环境变量

vim ~/.bashrc
export ZK_CLUSTER_HOME /usr/local/bin/zookeeper-cluster
source ~/.bashrc

2.3 创建节点目录

将Zookeeper安装目录复制3份：

cp -r apache-zookeeper-3.8.3-bin zookeeper-cluster/zookeeper-1
cp -r apache-zookeeper-3.8.3-bin zookeeper-cluster/zookeeper-2
cp -r apache-zookeeper-3.8.3-bin zookeeper-cluster/zookeeper-3

清理之前单实例产生的数据：

sudo rm -rf zookeeper-cluster/zookeeper-1/data
sudo rm -rf zookeeper-cluster/zookeeper-2/data
sudo rm -rf zookeeper-cluster/zookeeper-3/datasudo mkdir zookeeper-cluster/zookeeper-1/data
sudo mkdir zookeeper-cluster/zookeeper-2/data
sudo mkdir zookeeper-cluster/zookeeper-3/data

如果当前账号没有写权限，需要赋权限：

sudo chmod -R 777 zookeeper-cluster/zookeeper-1
sudo chmod -R 777 zookeeper-cluster/zookeeper-2
sudo chmod -R 777 zookeeper-cluster/zookeeper-3

2.4 修改配置

首先查询本机IP

ip addr

分别修改3个节点的配置

vim zookeeper-cluster/zookeeper-1/conf/zoo.cfg

dataDir=$ZK_CLUSTER_HOME/zookeeper-1/data
clientPort=2181
#Cluster
server.1=172.26.143.96:2881:3881
server.2=172.26.143.96:2882:3882
server.3=172.26.143.96:2883:3883

vim zookeeper-cluster/zookeeper-2/conf/zoo.cfg

dataDir=$ZK_CLUSTER_HOME/zookeeper-2/data
clientPort=2182
#Cluster
server.1=172.26.143.96:2881:3881
server.2=172.26.143.96:2882:3882
server.3=172.26.143.96:2883:3883

vim zookeeper-cluster/zookeeper-3/conf/zoo.cfg

dataDir=$ZK_CLUSTER_HOME/zookeeper-3/data
clientPort=2183
#Cluster
server.1=172.26.143.96:2881:3881
server.2=172.26.143.96:2882:3882
server.3=172.26.143.96:2883:3883

2.5 创建节点ID文件

echo 1 > zookeeper-cluster/zookeeper-1/data/myid
echo 2 > zookeeper-cluster/zookeeper-2/data/myid
echo 3 > zookeeper-cluster/zookeeper-3/data/myid

2.6 启动集群

分别启动三个Zookeeper实例：

$ZK_CLUSTER_HOME/zookeeper-1/bin/zkServer.sh start
$ZK_CLUSTER_HOME/zookeeper-2/bin/zkServer.sh start
$ZK_CLUSTER_HOME/zookeeper-3/bin/zkServer.sh start

查看节点状态：

ZK_CLUSTER_HOME/zookeeper-1/bin/zkServer.sh status

ZooKeeper JMX enabled by default
Using config: /usr/local/bin/zookeeper-cluster/zookeeper-1/bin/…/conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: follower

ZK_CLUSTER_HOME/zookeeper-2/bin/zkServer.sh status

ZooKeeper JMX enabled by default
Using config: /usr/local/bin/zookeeper-cluster/zookeeper-2/bin/…/conf/zoo.cfg
Client port found: 2182. Client address: localhost. Client SSL: false.
Mode: leader

ZK_CLUSTER_HOME/zookeeper-3/bin/zkServer.sh status

ZooKeeper JMX enabled by default
Using config: /usr/local/bin/zookeeper-cluster/zookeeper-3/bin/…/conf/zoo.cfg
Client port found: 2183. Client address: localhost. Client SSL: false.
Mode: follower

2.7 停止集群

$ZK_CLUSTER_HOME/zookeeper-1/bin/zkServer.sh stop
$ZK_CLUSTER_HOME/zookeeper-2/bin/zkServer.sh stop
$ZK_CLUSTER_HOME/zookeeper-3/bin/zkServer.sh stop