> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lwops.cn/llms.txt
> Use this file to discover all available pages before exploring further.

# 2.5. zookeeper

### 2.5.1. nc编译安装

[netcat-0.7.1.tar.gz](https://drive.weixin.qq.com/s?k=AAUAJQcEAEk00BrEmQAXQA6wYHAKM)

```plain theme={null}
# tar xvf netcat-0.7.1.tar.gz
# cd netcat-0.7.1
# ./configure --prefix=/usr/local/netcat/
# make install
# ln -s /usr/local/netcat/bin/nc /usr/bin
```

### 2.5.2. 部分版本默认启用四字命令，以下命令用于测试四字命令的启用情况

```plain theme={null}
# echo conf|nc  
```

![2.5. zookeeper 操作截图 1](https://lwweb.oss-cn-shenzhen.aliyuncs.com/docs/images/yuque/zookeeper/image-01.png)

若出现以上返回则说明四字命令未启用，需做以下配置

#### 2.5.2.1. 四字命令开启配置

（1）登录zookeeper服务器，修改zoo.cfg配置

```plain theme={null}
# vim /usr/local/zookeeper/conf/zoo.cfg
```

```plain theme={null}
4lw.commands.whitelist=*
```

![2.5. zookeeper 操作截图 2](https://lwweb.oss-cn-shenzhen.aliyuncs.com/docs/images/yuque/zookeeper/image-02.png)

（2）保存退出后重启zookeeper服务

```plain theme={null}
# service zookeeper restart
```

![2.5. zookeeper 操作截图 3](https://lwweb.oss-cn-shenzhen.aliyuncs.com/docs/images/yuque/zookeeper/image-03.png)

### 2.5.3. 平台添加监控

![2.5. zookeeper 操作截图 4](https://lwweb.oss-cn-shenzhen.aliyuncs.com/docs/images/yuque/zookeeper/image-04.png)

![2.5. zookeeper 操作截图 5](https://lwweb.oss-cn-shenzhen.aliyuncs.com/docs/images/yuque/zookeeper/image-05.png)