Linux 导出HADOOP\u CONF\u DIR=$HADOOP\u安装：etc/HADOOP/

当在伪分布式模式下安装hadoop时，我的初始错误如下

Starting namenodes on [localhost]
localhost: namenode running as process 20678. Stop it first.
localhost: datanode running as process 20831. Stop it first.
Starting secondary namenodes [0.0.0.0]
The authenticity of host '0.0.0.0 (0.0.0.0)' can't be established

我不小心违反了命令

hduser@x7158796-dsmprojb:/usr/local/hadoop$ export HADOOP_CONF_DIR=$HADOOP_INSTALL:etc/hadoop/
hduser@x7158796-dsmprojb:/usr/local/hadoop$ sbin/start-dfs.sh
Error: JAVA_HOME is not set and could not be found

现在它表明java home没有设置

我是linux新手，有人能帮我吗。？

---

.

您可以在这里找到一些示例

有几种方法可以找到java主页

红帽上

sudo /usr/sbin/alternatives --config java

然后

导出JAVA\u主页=

要么在shell中，要么将其添加到.profile/.bashrc/等中

export JAVA_HOME=<replace me with from above alteratives command>