ERROR: Attempting to operate on hdfs namenode as root ......

环境：hadoop-3.1.3

报错信息：

hadoop-3.1.3启动hadoop集群时还有可能可能会报如下错误信息：

[root@hadoop hadoop]# start-all.sh 
Starting namenodes on [iZbp13pwlxqwiu1xxb6szsZ]
ERROR: Attempting to operate on hdfs namenode as root
ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
Starting datanodes
ERROR: Attempting to operate on hdfs datanode as root
ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
Starting secondary namenodes [iZbp13pwlxqwiu1xxb6szsZ]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
Starting resourcemanager
ERROR: Attempting to operate on yarn resourcemanager as root
ERROR: but there is no YARN_RESOURCEMANAGER_USER defined. Aborting operation.
Starting nodemanagers
ERROR: Attempting to operate on yarn nodemanager as root
ERROR: but there is no YARN_NODEMANAGER_USER defined. Aborting operation.
[root@hadoop hadoop]#
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报错原因：

使用root账号启动服务，但没预先定义，缺少用户定义造成的。

解决方法:

分别编辑开始和关闭脚本

进入hadoop sbin目录

cd $HADOOP_HOME/sbin

vim start-dfs.sh
vim stop-dfs.sh
头部添加以下内容

#!/usr/bin/env bash
HDFS_DATANODE_USER=root
HADOOP_SECURE_DN_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
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vim start-yarn.sh
vim stop-yarn.sh
头部添加以下内容

#!/usr/bin/env bash
YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root
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修改完重启即可