# Flume客户端安装失败
#### 问题现象
安装Flume客户端失败，提示JAVA_HOME is null或flume has been installed。
```
CST 2016-08-31 17:02:51 [flume-client install]: JAVA_HOME is null in current user,please install the JDK and set the JAVA_HOME
CST 2016-08-31 17:02:51 [flume-client install]: check environment failed.
CST 2016-08-31 17:02:51 [flume-client install]: check param failed.
CST 2016-08-31 17:02:51 [flume-client install]: install flume client failed.
```
```
CST 2016-08-31 17:03:58 [flume-client install]: flume has been installed
CST 2016-08-31 17:03:58 [flume-client install]: check path failed.
CST 2016-08-31 17:03:58 [flume-client install]: check param failed.
CST 2016-08-31 17:03:58 [flume-client install]: install flume client failed.
```
#### 原因分析
- Flume客户端安装时会检查环境变量，如果没有可用的JAVA，会报错并退出安装。
- 指定的目录下已经安装有Flume客户端。
 
#### 解决办法
1. 如果报JAVA_HOME is null错误，需要使用命令： 
   **export JAVA_HOME=** *java路径*
   设置JAVA_HOME，重新运行安装脚本。
   
   
2. 如果指定的目录下已经安装有Flume客户端，需要先卸载已经存在的Flume客户端，或指定其他目录安装。