Hadoop之——以root身份启动Hadoop3.x报错

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1、使用root配置的hadoop并启动会出现报错

错误：       

Starting namenodes on [master]
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 [slave1]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.

解决方法：

在/hadoop/sbin路径下：将start-dfs.sh，stop-dfs.sh两个文件顶部添加以下参数

HDFS_DATANODE_USER=root
HADOOP_SECURE_DN_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root

start-yarn.sh，stop-yarn.sh顶部也需添加以下

YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root

还一种解决方案就是：以非root身份启动hadoop。

2、再次启动出现如下错误

WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. Using value of HADOOP_SECURE_DN_USER.
Starting namenodes on [binghe100]
binghe100: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
Starting datanodes
localhost: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
Starting secondary namenodes [binghe100]
binghe100: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
2019-06-23 16:32:18,082 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting resourcemanager
Starting nodemanagers
localhost: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).

解决办法：

配置免密登录（注意：对本机也需要配置）

ssh-keygen -t rsa
ssh-copy-id -i ~/.ssh/id_rsa.pub