问题描述：安装Hadoop3X HA完成后为了验证安装开启Hadoop

执行：start-all.sh

报错：

ERROR: Attempting to operate on hdfs namenode as root
ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
ERROR: Attempting to operate on hdfs datanode as root
ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
ERROR: Attempting to operate on hdfs journalnode as root
ERROR: but there is no HDFS_JOURNALNODE_USER defined. Aborting operation.

ERROR: Attempting to operate on hdfs journalnode as root
ERROR: but there is no YARN_RESOURCEMANAGER_USER Aborting operation.

ERROR: Attempting to operate on hdfs journalnode as root
ERROR: but there is no YARN_NODEMANAGER_USER Aborting operation.

错误原因：

试图以根用户身份在hdfs namenode上操作，但是没有定义HDFS _ NAMENODE _用户。中止操作。

解决：

在环境变量中在添加：

1.进入环境变量

vi ~/.bash_profile

2.添加： 

export HDFS_NAMENODE_USER=root
export HDFS_DATANODE_USER=root
export HDFS_JOURNALNODE_USER=root
export HDFS_SECONDARYNAMENODE_USER=root
export YARN_RESOURCEMANAGER_USER=root
export YARN_NODEMANAGER_USER=root

3.环境变量生效 

source ~/.bash_profile

 

完成！成功解决！！！