CentOS7 安装 Zookeeper

zookeeper官方下载：https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/

1、创建安装目录、并下载安装包

mkdir -p /usr/local/zookeeper
cd /usr/local/zookeeper
wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.4.10/zookeeper-3.4.10.tar.gz

2、解压安装包

tar -zxvf zookeeper-3.4.10.tar.gz

3、添加系统环境变量

输入 vim /etc/profile 命令打开系统配置文件，并在其尾部追加如下内容：

export ZOOKEEPER_HOME=/usr/local/zookeeper/zookeeper-3.4.10/
export PATH=$ZOOKEEPER_HOME/bin:$PATH
export PATH

输入 source /etc/profile 命令使其文件立即生效

4、修改zookeeper配置文件

将配置文件zoo_sample.cfg 复制为 zoo.cfg，操作如下：

cd /usr/local/zookeeper/zookeeper-3.4.10/
mkdir /usr/local/zookeeper/zookeeper-3.4.10/data
mkdir /usr/local/zookeeper/zookeeper-3.4.10/logs
​
cd /usr/local/zookeeper/zookeeper-3.4.10/conf/
cp zoo_sample.cfg zoo.cfg

使用 vim zoo.cfg 命令打开，并修改其内容如下：

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# 配置保存数据文件夹
dataDir=/usr/local/zookeeper/zookeeper-3.4.10/data
# 配置保存日志文件夹，当此配置不存在时默认路径与dataDir一致
dataLogDir=/usr/local/zookeeper/zookeeper-3.4.10/logs
# 客户端访问zookeeper的端口号
clientPort=2181

5、启动、关闭zookeeper服务
启动服务：zkServer.sh start
查看状态：zkServer.sh status
关闭服务：zkServer.sh stop
重启服务：zkServer.sh restart

6、开放防火墙端口

firewall-cmd --zone=public --add-port=2181/tcp --permanent # 防火墙开放2181端口
firewall-cmd --permanent --query-port=2181/tcp # 查询2181端口，返回yes
firewall-cmd --reload #重启防火墙