Hadoop之——以root身份啟動Hadoop3.x報錯

轉載請注明出處：https://blog.csdn.net/l1028386804/article/details/93380017

1、使用root配置的hadoop并啟動會出現報錯

錯誤：       

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.           

解決方法：

在/hadoop/sbin路徑下：将start-dfs.sh，stop-dfs.sh兩個檔案頂部添加以下參數

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

start-yarn.sh，stop-yarn.sh頂部也需添加以下

YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root           

還一種解決方案就是：以非root身份啟動hadoop。

2、再次啟動出現如下錯誤

WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER.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).           

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